[med-svn] [maxflow] 01/03: Imported Upstream version 3.0.4
Gert Wollny
gert-guest at moszumanska.debian.org
Tue Jul 21 16:37:53 UTC 2015
This is an automated email from the git hooks/post-receive script.
gert-guest pushed a commit to branch master
in repository maxflow.
commit f7d9a745f3d15d37f8ec1095278abf2c22b7ddfb
Author: Gert Wollny <gw.fossdev at gmail.com>
Date: Tue Jul 21 18:17:32 2015 +0200
Imported Upstream version 3.0.4
---
.gitignore | 3 +
CHANGES.TXT | 51 +++
CMakeLists.txt | 92 ++++++
GPL.TXT | 674 ++++++++++++++++++++++++++++++++++++++++
README.md | 129 ++++++++
maxflow.cpp | 33 ++
maxflow.h | 44 +++
maxflow.pc.cmake | 11 +
maxflow/CMakeLists.txt | 22 ++
maxflow/block.h | 319 +++++++++++++++++++
maxflow/graph.cpp | 819 +++++++++++++++++++++++++++++++++++++++++++++++++
maxflow/graph.h | 510 ++++++++++++++++++++++++++++++
test_maxflow.cpp | 207 +++++++++++++
13 files changed, 2914 insertions(+)
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..04d596f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+build
+*~
+
diff --git a/CHANGES.TXT b/CHANGES.TXT
new file mode 100644
index 0000000..d69fa59
--- /dev/null
+++ b/CHANGES.TXT
@@ -0,0 +1,51 @@
+List of changes from version 3.03:
+
+- Add CMake build files
+- Add simple unit test as test-maxflow executable
+- move some code around to put all graph implementation code into one file
+- make it compile to a shared library
+- provide the standard instanciations that were in "instances.inc" as typedefs
+ they are the ones that are provided by the shared library
+- silence a warning about assignment in "if"
+- put header files into a maxflow subdirectory to avoid possible conflicts with
+ other header files named "graph.h"
+
+List of changes from version 3.02:
+
+- put under GPL license
+
+List of changes from version 3.01:
+
+- fixed a bug: using add_node() or add_edge() after the first maxflow() with the reuse_trees option
+ could have caused segmentation fault (if nodes or arcs are reallocated). Thanks to Jan Lellmann for pointing out this bug.
+- updated block.h to suppress compilation warnings
+
+List of changes from version 3.0:
+- Moved line
+ #include "instances.inc"
+to the end of cpp files to make it compile under GNU c++ compilers 4.2(?) and above
+
+List of changes from version 2.2:
+
+- Added functions for accessing graph structure, residual capacities, etc.
+ (They are needed for implementing maxflow-based algorithms such as primal-dual algorithm for convex MRFs.)
+- Added option of reusing trees.
+- node_id's are now integers starting from 0. Thus, it is not necessary to store node_id's in a separate array.
+- Capacity types are now templated.
+- Fixed bug in block.h. (After Block<type>::Reset, ScanFirst() and ScanNext() did not work properly).
+- Implementation with a forward star representation of the graph is no longer supported. (It needs less memory, but slightly slower than adjacency list representation.) If you still wish to use it, download version 2.2.
+- Note: version 3.0 is released under a different license than version 2.2.
+
+List of changes from version 2.1:
+
+- Put the code under GPL license
+
+List of changes from version 2.02:
+
+- Fixed a bug in the implementation that uses forward star representation
+
+List of changes from version 2.01:
+
+- Added new interface function - Graph::add_tweights(Node_id, captype, captype)
+ (necessary for the "ENERGY" software package)
+
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..cba0a10
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,92 @@
+# This file is part of MAXFLOW.
+
+# MAXFLOW is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# MAXFLOW is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with MAXFLOW. If not, see <http://www.gnu.org/licenses/>.
+
+
+PROJECT("maxflow")
+
+CMAKE_MINIMUM_REQUIRED(VERSION 2.8.5 FATAL_ERROR)
+
+if(COMMAND cmake_policy)
+ cmake_policy(SET CMP0003 NEW)
+ cmake_policy(SET CMP0012 NEW)
+ IF(${CMAKE_VERSION} VERSION_GREATER 3.0.0)
+ cmake_policy(SET CMP0042 NEW)
+ ENDIF()
+endif(COMMAND cmake_policy)
+
+
+SET(PACKAGE_NAME "maxflow")
+SET(MAJOR_VERSION 3)
+SET(MINOR_VERSION 0)
+SET(MICRO_VERSION 4)
+SET(INTERFACE_AGE 4)
+SET(BINARY_AGE 4)
+
+
+SET(PACKAGE_VERSION "${MAJOR_VERSION}.${MINOR_VERSION}.${MICRO_VERSION}")
+SET(VERSION "${MAJOR_VERSION}.${MINOR_VERSION}")
+SET(PACKAGE_NAME "${PACKAGE_NAME}-${VERSION}")
+SET(prefix ${CMAKE_INSTALL_PREFIX})
+
+
+MATH(EXPR MAXFLOW_CURRENT "${MICRO_VERSION} - ${BINARY_AGE}")
+SET(MAXFLOW_REVISION ${INTERFACE_AGE})
+MATH(EXPR MAXFLOW_AGE "${BINARY_AGE} - ${INTERFACE_AGE}")
+
+SET(LIBRARY_SOVERSION_INFO "${MAXFLOW_CURRENT}")
+SET(LIBRARY_VERSION_INFO "${MAXFLOW_CURRENT}.${MAXFLOW_AGE}.${MAXFLOW_REVISION}")
+
+INCLUDE(GNUInstallDirs)
+
+SET(INCLUDE_INSTALL_PATH ${CMAKE_INSTALL_INCLUDEDIR}/maxflow-${VERSION})
+
+
+ADD_SUBDIRECTORY(maxflow)
+INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR})
+
+ADD_LIBRARY(maxflow SHARED maxflow.cpp)
+SET_TARGET_PROPERTIES(maxflow PROPERTIES
+ SOVERSION ${LIBRARY_SOVERSION_INFO}
+ VERSION ${LIBRARY_VERSION_INFO}
+ )
+
+INSTALL(TARGETS maxflow
+ EXPORT MaxFlow
+ RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
+ LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+ ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}")
+
+
+
+SET(LIBRARY_INSTALL_PATH ${CMAKE_INSTALL_LIBDIR})
+
+
+
+CONFIGURE_FILE(${CMAKE_CURRENT_SOURCE_DIR}/maxflow.pc.cmake ${CMAKE_CURRENT_BINARY_DIR}/maxflow.pc)
+
+INSTALL(FILES ${CMAKE_CURRENT_BINARY_DIR}/maxflow.pc DESTINATION "${CMAKE_INSTALL_FULL_LIBDIR}/pkgconfig")
+SET(MAXFLOW_BASE_HEADER
+ maxflow.h
+ )
+
+INSTALL(FILES ${MAXFLOW_BASE_HEADER} DESTINATION ${INCLUDE_INSTALL_PATH})
+
+
+
+ADD_EXECUTABLE(test-maxflow test_maxflow.cpp)
+TARGET_LINK_LIBRARIES(test-maxflow maxflow)
+
+ENABLE_TESTING()
+ADD_TEST(maxflow test-maxflow)
\ No newline at end of file
diff --git a/GPL.TXT b/GPL.TXT
new file mode 100644
index 0000000..94a9ed0
--- /dev/null
+++ b/GPL.TXT
@@ -0,0 +1,674 @@
+ GNU GENERAL PUBLIC LICENSE
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+
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+
+ Nothing in this License shall be construed as excluding or limiting
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+ 12. No Surrender of Others' Freedom.
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+ 13. Use with the GNU Affero General Public License.
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+ If the Program specifies that a proxy can decide which future
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+ 17. Interpretation of Sections 15 and 16.
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+
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+
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+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
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+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
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+ <one line to give the program's name and a brief idea of what it does.>
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+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
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+ <program> Copyright (C) <year> <name of author>
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
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+
+The hypothetical commands `show w' and `show c' should show the appropriate
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+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
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+
+ The GNU General Public License does not permit incorporating your program
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+may consider it more useful to permit linking proprietary applications with
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+Public License instead of this License. But first, please read
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diff --git a/README.md b/README.md
new file mode 100644
index 0000000..2dba7bc
--- /dev/null
+++ b/README.md
@@ -0,0 +1,129 @@
+# MAXFLOW - software for computing mincut/maxflow in a graph #
+# Version 3.04 #
+
+The original implementation can be found at
+
+ http://pub.ist.ac.at/~vnk/software.html
+
+and was implemented by
+
+ Yuri Boykov (yuri at csd.uwo.ca)
+ Vladimir Kolmogorov (vnk at ist.ac.at)
+ 2001-2006
+
+## Introduction.
+
+This software library implements the maxflow algorithm described in
+
+ "An Experimental Comparison of Min-Cut/Max-Flow Algorithms
+ for Energy Minimization in Vision."
+ Yuri Boykov and Vladimir Kolmogorov.
+ In IEEE Transactions on Pattern Analysis and Machine Intelligence (PAMI),
+ September 2004
+ http://dx.doi.org/10.1109/TPAMI.2004.60
+
+This algorithm was developed by Yuri Boykov and Vladimir Kolmogorov
+at Siemens Corporate Research. To make it available for public use,
+it was later reimplemented by Vladimir Kolmogorov based on open publications.
+
+If you use this software for research purposes, you should cite
+the aforementioned paper in any resulting publication.
+
+----------------------------------------------------------------------
+
+### Reusing trees
+
+Starting with version 3.0, there is a also an option of reusing search
+trees from one maxflow computation to the next, as described in
+
+ "Efficiently Solving Dynamic Markov Random Fields Using Graph Cuts."
+ Pushmeet Kohli and Philip H.S. Torr
+ International Conference on Computer Vision (ICCV), 2005
+
+If you use this option, you should cite
+the aforementioned paper in any resulting publication.
+
+Tested under windows, Visual C++ 6.0 compiler and unix (SunOS 5.8
+and RedHat Linux 7.0, Gentoo Linux, GNU C++ compiler).
+
+## License & disclaimer.
+
+ Copyright 2001-2006 Vladimir Kolmogorov (vnk at ist.ac.at), Yuri Boykov (yuri at csd.uwo.ca).
+
+ This software is under the GPL license.
+ If you require another license, you may consider using version 2.21
+ (which implements exactly the same algorithm, but does not have
+ the option of reusing search trees).
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+### Example usage.
+
+This section shows how to use the library to compute
+a minimum cut on the following graph:
+
+ SOURCE
+ / \
+ 1/ \2
+ / 3 \
+ node0 -----> node1
+ | <----- |
+ | 4 |
+ \ /
+ 5\ /6
+ \ /
+ SINK
+
+
+----
+
+ #include <stdio.h>
+ #include <maxflow/graph.h>
+
+ int main()
+ {
+ typedef Graph<int,int,int> GraphType;
+ GraphType *g = new GraphType(/*estimated # of nodes*/ 2, /*estimated # of edges*/ 1);
+
+ g -> add_node();
+ g -> add_node();
+
+ g -> add_tweights( 0, /* capacities */ 1, 5 );
+ g -> add_tweights( 1, /* capacities */ 2, 6 );
+ g -> add_edge( 0, 1, /* capacities */ 3, 4 );
+
+ int flow = g -> maxflow();
+
+ printf("Flow = %d\n", flow);
+ printf("Minimum cut:\n");
+ if (g->what_segment(0) == GraphType::SOURCE)
+ printf("node0 is in the SOURCE set\n");
+ else
+ printf("node0 is in the SINK set\n");
+ if (g->what_segment(1) == GraphType::SOURCE)
+ printf("node1 is in the SOURCE set\n");
+ else
+ printf("node1 is in the SINK set\n");
+
+ delete g;
+
+ return 0;
+ }
+
+
+### Additional notes
+
+The build system, unit tests, and creation of a shared library was done by Gert Wollny <gw.fossdev at gmail.com> here
+in this github repository.
+
diff --git a/maxflow.cpp b/maxflow.cpp
new file mode 100644
index 0000000..28d49f7
--- /dev/null
+++ b/maxflow.cpp
@@ -0,0 +1,33 @@
+/* maxflow.cpp */
+/*
+ Copyright Vladimir Kolmogorov (vnk at ist.ac.at), Yuri Boykov (yuri at csd.uwo.ca)
+
+ This file is part of MAXFLOW.
+
+ MAXFLOW is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ MAXFLOW is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with MAXFLOW. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+
+#include <stdio.h>
+
+#define MAXFLOW_INCLUDE_TEMPLATE_IMPLEMENTATION 1
+#include <maxflow.h>
+
+namespace maxflow {
+template class Graph<int,int,int>;
+template class Graph<short,int,int>;
+template class Graph<float,float,float>;
+template class Graph<double,double,double>;
+}
+
diff --git a/maxflow.h b/maxflow.h
new file mode 100644
index 0000000..f3dd2ed
--- /dev/null
+++ b/maxflow.h
@@ -0,0 +1,44 @@
+/*
+ Copyright Vladimir Kolmogorov (vnk at ist.ac.at), Yuri Boykov (yuri at csd.uwo.ca)
+
+ This file is part of MAXFLOW.
+
+ MAXFLOW is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ MAXFLOW is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with MAXFLOW. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+
+#ifndef maxflow_h
+#define maxflow_h
+
+#include <maxflow/block.h>
+#include <maxflow/graph.h>
+
+
+namespace maxflow {
+
+typedef Graph<int,int,int> Graph_III;
+typedef Graph<short,int,int> Graph_SII;
+typedef Graph<float,float,float> Graph_FFF;
+typedef Graph<double,double,double> Graph_DDD;
+
+}
+
+// define this if you want to instanciate a graph different from
+// the above
+#ifdef MAXFLOW_INCLUDE_TEMPLATE_IMPLEMENTATION
+#include <maxflow/graph.cpp>
+#endif
+
+
+#endif
diff --git a/maxflow.pc.cmake b/maxflow.pc.cmake
new file mode 100644
index 0000000..ec139d8
--- /dev/null
+++ b/maxflow.pc.cmake
@@ -0,0 +1,11 @@
+prefix=@prefix@
+exec_prefix=${prefix}
+libdir=${prefix}/@LIBRARY_INSTALL_PATH@
+includedir=${prefix}/@INCLUDE_INSTALL_PATH@
+
+Name: maxflow
+Description: A library implementing the max-flow/min-cut algorithm
+Version: @PACKAGE_VERSION@
+Conflicts:
+Libs: -lmaxflow -L${prefix}/@LIBRARY_INSTALL_PATH@
+Cflags: -I${prefix}/@INCLUDE_INSTALL_PATH@
diff --git a/maxflow/CMakeLists.txt b/maxflow/CMakeLists.txt
new file mode 100644
index 0000000..4a1c278
--- /dev/null
+++ b/maxflow/CMakeLists.txt
@@ -0,0 +1,22 @@
+# This file is part of MAXFLOW.
+
+# MAXFLOW is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# MAXFLOW is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with MAXFLOW. If not, see <http://www.gnu.org/licenses/>.
+
+SET(MAXFLOW_HEADER
+ block.h
+ graph.h
+ graph.cpp)
+
+INSTALL(FILES ${MAXFLOW_HEADER} DESTINATION "${INCLUDE_INSTALL_PATH}/maxflow")
+
diff --git a/maxflow/block.h b/maxflow/block.h
new file mode 100644
index 0000000..a0ee762
--- /dev/null
+++ b/maxflow/block.h
@@ -0,0 +1,319 @@
+/*
+ Copyright Vladimir Kolmogorov (vnk at ist.ac.at), Yuri Boykov (yuri at csd.uwo.ca)
+
+ This file is part of MAXFLOW.
+
+ MAXFLOW is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ MAXFLOW is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with MAXFLOW. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/* block.h */
+/* Vladimir Kolmogorov vnk at ist.ac.at */
+/* Last modified 08/05/2012 */
+/*
+ Template classes Block and DBlock
+ Implement adding and deleting items of the same type in blocks.
+
+ If there there are many items then using Block or DBlock
+ is more efficient than using 'new' and 'delete' both in terms
+ of memory and time since
+ (1) On some systems there is some minimum amount of memory
+ that 'new' can allocate (e.g., 64), so if items are
+ small that a lot of memory is wasted.
+ (2) 'new' and 'delete' are designed for items of varying size.
+ If all items has the same size, then an algorithm for
+ adding and deleting can be made more efficient.
+ (3) All Block and DBlock functions are inline, so there are
+ no extra function calls.
+
+ Differences between Block and DBlock:
+ (1) DBlock allows both adding and deleting items,
+ whereas Block allows only adding items.
+ (2) Block has an additional operation of scanning
+ items added so far (in the order in which they were added).
+ (3) Block allows to allocate several consecutive
+ items at a time, whereas DBlock can add only a single item.
+
+ Note that no constructors or destructors are called for items.
+
+ Example usage for items of type 'MyType':
+
+ ///////////////////////////////////////////////////
+ #include "block.h"
+ #define BLOCK_SIZE 1024
+ typedef struct { int a, b; } MyType;
+ MyType *ptr, *array[10000];
+
+ ...
+
+ Block<MyType> *block = new Block<MyType>(BLOCK_SIZE);
+
+ // adding items
+ for (int i=0; i<sizeof(array); i++)
+ {
+ ptr = block -> New();
+ ptr -> a = ptr -> b = rand();
+ }
+
+ // reading items
+ for (ptr=block->ScanFirst(); ptr; ptr=block->ScanNext())
+ {
+ printf("%d %d\n", ptr->a, ptr->b);
+ }
+
+ delete block;
+
+ ...
+
+ DBlock<MyType> *dblock = new DBlock<MyType>(BLOCK_SIZE);
+
+ // adding items
+ for (int i=0; i<sizeof(array); i++)
+ {
+ array[i] = dblock -> New();
+ }
+
+ // deleting items
+ for (int i=0; i<sizeof(array); i+=2)
+ {
+ dblock -> Delete(array[i]);
+ }
+
+ // adding items
+ for (int i=0; i<sizeof(array); i++)
+ {
+ array[i] = dblock -> New();
+ }
+
+ delete dblock;
+
+ ///////////////////////////////////////////////////
+
+ Note that DBlock deletes items by marking them as
+ empty (i.e., by adding them to the list of free items),
+ so that this memory could be used for subsequently
+ added items. Thus, at each moment the memory allocated
+ is determined by the maximum number of items allocated
+ simultaneously at earlier moments. All memory is
+ deallocated only when the destructor is called.
+*/
+
+#ifndef __BLOCK_H__
+#define __BLOCK_H__
+
+#include <stdlib.h>
+
+/***********************************************************************/
+/***********************************************************************/
+/***********************************************************************/
+
+namespace maxflow {
+
+template <class Type> class Block
+{
+public:
+ /* Constructor. Arguments are the block size and
+ (optionally) the pointer to the function which
+ will be called if allocation failed; the message
+ passed to this function is "Not enough memory!" */
+ Block(int size, void (*err_function)(const char *) = NULL) { first = last = NULL; block_size = size; error_function = err_function; }
+
+ /* Destructor. Deallocates all items added so far */
+ ~Block() { while (first) { block *next = first -> next; delete[] ((char*)first); first = next; } }
+
+ /* Allocates 'num' consecutive items; returns pointer
+ to the first item. 'num' cannot be greater than the
+ block size since items must fit in one block */
+ Type *New(int num = 1)
+ {
+ Type *t;
+
+ if (!last || last->current + num > last->last)
+ {
+ if (last && last->next) last = last -> next;
+ else
+ {
+ block *next = (block *) new char [sizeof(block) + (block_size-1)*sizeof(Type)];
+ if (!next) { if (error_function) (*error_function)("Not enough memory!"); exit(1); }
+ if (last) last -> next = next;
+ else first = next;
+ last = next;
+ last -> current = & ( last -> data[0] );
+ last -> last = last -> current + block_size;
+ last -> next = NULL;
+ }
+ }
+
+ t = last -> current;
+ last -> current += num;
+ return t;
+ }
+
+ /* Returns the first item (or NULL, if no items were added) */
+ Type *ScanFirst()
+ {
+ for (scan_current_block=first; scan_current_block; scan_current_block = scan_current_block->next)
+ {
+ scan_current_data = & ( scan_current_block -> data[0] );
+ if (scan_current_data < scan_current_block -> current) return scan_current_data ++;
+ }
+ return NULL;
+ }
+
+ /* Returns the next item (or NULL, if all items have been read)
+ Can be called only if previous ScanFirst() or ScanNext()
+ call returned not NULL. */
+ Type *ScanNext()
+ {
+ while (scan_current_data >= scan_current_block -> current)
+ {
+ scan_current_block = scan_current_block -> next;
+ if (!scan_current_block) return NULL;
+ scan_current_data = & ( scan_current_block -> data[0] );
+ }
+ return scan_current_data ++;
+ }
+
+ struct iterator; // for overlapping scans
+ Type *ScanFirst(iterator& i)
+ {
+ for (i.scan_current_block=first; i.scan_current_block; i.scan_current_block = i.scan_current_block->next)
+ {
+ i.scan_current_data = & ( i.scan_current_block -> data[0] );
+ if (i.scan_current_data < i.scan_current_block -> current) return i.scan_current_data ++;
+ }
+ return NULL;
+ }
+ Type *ScanNext(iterator& i)
+ {
+ while (i.scan_current_data >= i.scan_current_block -> current)
+ {
+ i.scan_current_block = i.scan_current_block -> next;
+ if (!i.scan_current_block) return NULL;
+ i.scan_current_data = & ( i.scan_current_block -> data[0] );
+ }
+ return i.scan_current_data ++;
+ }
+
+ /* Marks all elements as empty */
+ void Reset()
+ {
+ block *b;
+ if (!first) return;
+ for (b=first; ; b=b->next)
+ {
+ b -> current = & ( b -> data[0] );
+ if (b == last) break;
+ }
+ last = first;
+ }
+
+/***********************************************************************/
+
+private:
+
+ typedef struct block_st
+ {
+ Type *current, *last;
+ struct block_st *next;
+ Type data[1];
+ } block;
+
+ int block_size;
+ block *first;
+ block *last;
+public:
+ struct iterator
+ {
+ block *scan_current_block;
+ Type *scan_current_data;
+ };
+private:
+ block *scan_current_block;
+ Type *scan_current_data;
+
+ void (*error_function)(const char *);
+};
+
+/***********************************************************************/
+/***********************************************************************/
+/***********************************************************************/
+
+template <class Type> class DBlock
+{
+public:
+ /* Constructor. Arguments are the block size and
+ (optionally) the pointer to the function which
+ will be called if allocation failed; the message
+ passed to this function is "Not enough memory!" */
+ DBlock(int size, void (*err_function)(const char *) = NULL) { first = NULL; first_free = NULL; block_size = size; error_function = err_function; }
+
+ /* Destructor. Deallocates all items added so far */
+ ~DBlock() { while (first) { block *next = first -> next; delete[] ((char*)first); first = next; } }
+
+ /* Allocates one item */
+ Type *New()
+ {
+ block_item *item;
+
+ if (!first_free)
+ {
+ block *next = first;
+ first = (block *) new char [sizeof(block) + (block_size-1)*sizeof(block_item)];
+ if (!first) { if (error_function) (*error_function)("Not enough memory!"); exit(1); }
+ first_free = & (first -> data[0] );
+ for (item=first_free; item<first_free+block_size-1; item++)
+ item -> next_free = item + 1;
+ item -> next_free = NULL;
+ first -> next = next;
+ }
+
+ item = first_free;
+ first_free = item -> next_free;
+ return (Type *) item;
+ }
+
+ /* Deletes an item allocated previously */
+ void Delete(Type *t)
+ {
+ ((block_item *) t) -> next_free = first_free;
+ first_free = (block_item *) t;
+ }
+
+/***********************************************************************/
+
+private:
+
+ typedef union block_item_st
+ {
+ Type t;
+ block_item_st *next_free;
+ } block_item;
+
+ typedef struct block_st
+ {
+ struct block_st *next;
+ block_item data[1];
+ } block;
+
+ int block_size;
+ block *first;
+ block_item *first_free;
+
+ void (*error_function)(const char *);
+};
+
+} // end namespace maxflow
+
+#endif
+
diff --git a/maxflow/graph.cpp b/maxflow/graph.cpp
new file mode 100644
index 0000000..42c4478
--- /dev/null
+++ b/maxflow/graph.cpp
@@ -0,0 +1,819 @@
+/* graph.cpp provides the implementation of the template methods */
+
+/*
+ Copyright Vladimir Kolmogorov (vnk at ist.ac.at), Yuri Boykov (yuri at csd.uwo.ca)
+
+ This file is part of MAXFLOW.
+
+ MAXFLOW is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ MAXFLOW is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with MAXFLOW. If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "graph.h"
+
+namespace maxflow {
+
+#define TERMINAL ( (arc *) 1 ) /* to terminal */
+#define ORPHAN ( (arc *) 2 ) /* orphan */
+
+template <typename captype, typename tcaptype, typename flowtype>
+ Graph<captype, tcaptype, flowtype>::Graph(int node_num_max, int edge_num_max, void (*err_function)(const char *))
+ : node_num(0),
+ nodeptr_block(NULL),
+ error_function(err_function)
+{
+ if (node_num_max < 16) node_num_max = 16;
+ if (edge_num_max < 16) edge_num_max = 16;
+
+ nodes = (node*) malloc(node_num_max*sizeof(node));
+ arcs = (arc*) malloc(2*edge_num_max*sizeof(arc));
+ if (!nodes || !arcs) { if (error_function) (*error_function)("Not enough memory!"); exit(1); }
+
+ node_last = nodes;
+ node_max = nodes + node_num_max;
+ arc_last = arcs;
+ arc_max = arcs + 2*edge_num_max;
+
+ maxflow_iteration = 0;
+ flow = 0;
+}
+
+template <typename captype, typename tcaptype, typename flowtype>
+ Graph<captype,tcaptype,flowtype>::~Graph()
+{
+ if (nodeptr_block)
+ {
+ delete nodeptr_block;
+ nodeptr_block = NULL;
+ }
+ free(nodes);
+ free(arcs);
+}
+
+template <typename captype, typename tcaptype, typename flowtype>
+ void Graph<captype,tcaptype,flowtype>::reset()
+{
+ node_last = nodes;
+ arc_last = arcs;
+ node_num = 0;
+
+ if (nodeptr_block)
+ {
+ delete nodeptr_block;
+ nodeptr_block = NULL;
+ }
+
+ maxflow_iteration = 0;
+ flow = 0;
+}
+
+template <typename captype, typename tcaptype, typename flowtype>
+ void Graph<captype,tcaptype,flowtype>::reallocate_nodes(int num)
+{
+ int node_num_max = (int)(node_max - nodes);
+ node* nodes_old = nodes;
+
+ node_num_max += node_num_max / 2;
+ if (node_num_max < node_num + num) node_num_max = node_num + num;
+ nodes = (node*) realloc(nodes_old, node_num_max*sizeof(node));
+ if (!nodes) { if (error_function) (*error_function)("Not enough memory!"); exit(1); }
+
+ node_last = nodes + node_num;
+ node_max = nodes + node_num_max;
+
+ if (nodes != nodes_old)
+ {
+ node* i;
+ arc* a;
+ for (i=nodes; i<node_last; i++)
+ {
+ if (i->next) i->next = (node*) ((char*)i->next + (((char*) nodes) - ((char*) nodes_old)));
+ }
+ for (a=arcs; a<arc_last; a++)
+ {
+ a->head = (node*) ((char*)a->head + (((char*) nodes) - ((char*) nodes_old)));
+ }
+ }
+}
+
+template <typename captype, typename tcaptype, typename flowtype>
+ void Graph<captype,tcaptype,flowtype>::reallocate_arcs()
+{
+ int arc_num_max = (int)(arc_max - arcs);
+ int arc_num = (int)(arc_last - arcs);
+ arc* arcs_old = arcs;
+
+ arc_num_max += arc_num_max / 2; if (arc_num_max & 1) arc_num_max ++;
+ arcs = (arc*) realloc(arcs_old, arc_num_max*sizeof(arc));
+ if (!arcs) { if (error_function) (*error_function)("Not enough memory!"); exit(1); }
+
+ arc_last = arcs + arc_num;
+ arc_max = arcs + arc_num_max;
+
+ if (arcs != arcs_old)
+ {
+ node* i;
+ arc* a;
+ for (i=nodes; i<node_last; i++)
+ {
+ if (i->first) i->first = (arc*) ((char*)i->first + (((char*) arcs) - ((char*) arcs_old)));
+ if (i->parent && i->parent != ORPHAN && i->parent != TERMINAL) i->parent = (arc*) ((char*)i->parent + (((char*) arcs) - ((char*) arcs_old)));
+ }
+ for (a=arcs; a<arc_last; a++)
+ {
+ if (a->next) a->next = (arc*) ((char*)a->next + (((char*) arcs) - ((char*) arcs_old)));
+ a->sister = (arc*) ((char*)a->sister + (((char*) arcs) - ((char*) arcs_old)));
+ }
+ }
+}
+
+#define INFINITE_D ((int)(((unsigned)-1)/2)) /* infinite distance to the terminal */
+
+/***********************************************************************/
+
+/*
+ Functions for processing active list.
+ i->next points to the next node in the list
+ (or to i, if i is the last node in the list).
+ If i->next is NULL iff i is not in the list.
+
+ There are two queues. Active nodes are added
+ to the end of the second queue and read from
+ the front of the first queue. If the first queue
+ is empty, it is replaced by the second queue
+ (and the second queue becomes empty).
+*/
+
+
+template <typename captype, typename tcaptype, typename flowtype>
+ inline void Graph<captype,tcaptype,flowtype>::set_active(node *i)
+{
+ if (!i->next)
+ {
+ /* it's not in the list yet */
+ if (queue_last[1]) queue_last[1] -> next = i;
+ else queue_first[1] = i;
+ queue_last[1] = i;
+ i -> next = i;
+ }
+}
+
+/*
+ Returns the next active node.
+ If it is connected to the sink, it stays in the list,
+ otherwise it is removed from the list
+*/
+template <typename captype, typename tcaptype, typename flowtype>
+ inline typename Graph<captype,tcaptype,flowtype>::node* Graph<captype,tcaptype,flowtype>::next_active()
+{
+ node *i;
+
+ while ( 1 )
+ {
+ if (!(i=queue_first[0]))
+ {
+ queue_first[0] = i = queue_first[1];
+ queue_last[0] = queue_last[1];
+ queue_first[1] = NULL;
+ queue_last[1] = NULL;
+ if (!i) return NULL;
+ }
+
+ /* remove it from the active list */
+ if (i->next == i) queue_first[0] = queue_last[0] = NULL;
+ else queue_first[0] = i -> next;
+ i -> next = NULL;
+
+ /* a node in the list is active iff it has a parent */
+ if (i->parent) return i;
+ }
+}
+
+/***********************************************************************/
+
+template <typename captype, typename tcaptype, typename flowtype>
+ inline void Graph<captype,tcaptype,flowtype>::set_orphan_front(node *i)
+{
+ nodeptr *np;
+ i -> parent = ORPHAN;
+ np = nodeptr_block -> New();
+ np -> ptr = i;
+ np -> next = orphan_first;
+ orphan_first = np;
+}
+
+template <typename captype, typename tcaptype, typename flowtype>
+ inline void Graph<captype,tcaptype,flowtype>::set_orphan_rear(node *i)
+{
+ nodeptr *np;
+ i -> parent = ORPHAN;
+ np = nodeptr_block -> New();
+ np -> ptr = i;
+ if (orphan_last) orphan_last -> next = np;
+ else orphan_first = np;
+ orphan_last = np;
+ np -> next = NULL;
+}
+
+/***********************************************************************/
+
+template <typename captype, typename tcaptype, typename flowtype>
+ inline void Graph<captype,tcaptype,flowtype>::add_to_changed_list(node *i)
+{
+ if (changed_list && !i->is_in_changed_list)
+ {
+ node_id* ptr = changed_list->New();
+ *ptr = (node_id)(i - nodes);
+ i->is_in_changed_list = true;
+ }
+}
+
+/***********************************************************************/
+
+template <typename captype, typename tcaptype, typename flowtype>
+ void Graph<captype,tcaptype,flowtype>::maxflow_init()
+{
+ node *i;
+
+ queue_first[0] = queue_last[0] = NULL;
+ queue_first[1] = queue_last[1] = NULL;
+ orphan_first = NULL;
+
+ TIME = 0;
+
+ for (i=nodes; i<node_last; i++)
+ {
+ i -> next = NULL;
+ i -> is_marked = 0;
+ i -> is_in_changed_list = 0;
+ i -> TS = TIME;
+ if (i->tr_cap > 0)
+ {
+ /* i is connected to the source */
+ i -> is_sink = 0;
+ i -> parent = TERMINAL;
+ set_active(i);
+ i -> DIST = 1;
+ }
+ else if (i->tr_cap < 0)
+ {
+ /* i is connected to the sink */
+ i -> is_sink = 1;
+ i -> parent = TERMINAL;
+ set_active(i);
+ i -> DIST = 1;
+ }
+ else
+ {
+ i -> parent = NULL;
+ }
+ }
+}
+
+template <typename captype, typename tcaptype, typename flowtype>
+ void Graph<captype,tcaptype,flowtype>::maxflow_reuse_trees_init()
+{
+ node* i;
+ node* j;
+ node* queue = queue_first[1];
+ arc* a;
+ nodeptr* np;
+
+ queue_first[0] = queue_last[0] = NULL;
+ queue_first[1] = queue_last[1] = NULL;
+ orphan_first = orphan_last = NULL;
+
+ TIME ++;
+
+ while ((i=queue))
+ {
+ queue = i->next;
+ if (queue == i) queue = NULL;
+ i->next = NULL;
+ i->is_marked = 0;
+ set_active(i);
+
+ if (i->tr_cap == 0)
+ {
+ if (i->parent) set_orphan_rear(i);
+ continue;
+ }
+
+ if (i->tr_cap > 0)
+ {
+ if (!i->parent || i->is_sink)
+ {
+ i->is_sink = 0;
+ for (a=i->first; a; a=a->next)
+ {
+ j = a->head;
+ if (!j->is_marked)
+ {
+ if (j->parent == a->sister) set_orphan_rear(j);
+ if (j->parent && j->is_sink && a->r_cap > 0) set_active(j);
+ }
+ }
+ add_to_changed_list(i);
+ }
+ }
+ else
+ {
+ if (!i->parent || !i->is_sink)
+ {
+ i->is_sink = 1;
+ for (a=i->first; a; a=a->next)
+ {
+ j = a->head;
+ if (!j->is_marked)
+ {
+ if (j->parent == a->sister) set_orphan_rear(j);
+ if (j->parent && !j->is_sink && a->sister->r_cap > 0) set_active(j);
+ }
+ }
+ add_to_changed_list(i);
+ }
+ }
+ i->parent = TERMINAL;
+ i -> TS = TIME;
+ i -> DIST = 1;
+ }
+
+ //test_consistency();
+
+ /* adoption */
+ while ((np=orphan_first))
+ {
+ orphan_first = np -> next;
+ i = np -> ptr;
+ nodeptr_block -> Delete(np);
+ if (!orphan_first) orphan_last = NULL;
+ if (i->is_sink) process_sink_orphan(i);
+ else process_source_orphan(i);
+ }
+ /* adoption end */
+
+ //test_consistency();
+}
+
+template <typename captype, typename tcaptype, typename flowtype>
+ void Graph<captype,tcaptype,flowtype>::augment(arc *middle_arc)
+{
+ node *i;
+ arc *a;
+ tcaptype bottleneck;
+
+
+ /* 1. Finding bottleneck capacity */
+ /* 1a - the source tree */
+ bottleneck = middle_arc -> r_cap;
+ for (i=middle_arc->sister->head; ; i=a->head)
+ {
+ a = i -> parent;
+ if (a == TERMINAL) break;
+ if (bottleneck > a->sister->r_cap) bottleneck = a -> sister -> r_cap;
+ }
+ if (bottleneck > i->tr_cap) bottleneck = i -> tr_cap;
+ /* 1b - the sink tree */
+ for (i=middle_arc->head; ; i=a->head)
+ {
+ a = i -> parent;
+ if (a == TERMINAL) break;
+ if (bottleneck > a->r_cap) bottleneck = a -> r_cap;
+ }
+ if (bottleneck > - i->tr_cap) bottleneck = - i -> tr_cap;
+
+
+ /* 2. Augmenting */
+ /* 2a - the source tree */
+ middle_arc -> sister -> r_cap += bottleneck;
+ middle_arc -> r_cap -= bottleneck;
+ for (i=middle_arc->sister->head; ; i=a->head)
+ {
+ a = i -> parent;
+ if (a == TERMINAL) break;
+ a -> r_cap += bottleneck;
+ a -> sister -> r_cap -= bottleneck;
+ if (!a->sister->r_cap)
+ {
+ set_orphan_front(i); // add i to the beginning of the adoption list
+ }
+ }
+ i -> tr_cap -= bottleneck;
+ if (!i->tr_cap)
+ {
+ set_orphan_front(i); // add i to the beginning of the adoption list
+ }
+ /* 2b - the sink tree */
+ for (i=middle_arc->head; ; i=a->head)
+ {
+ a = i -> parent;
+ if (a == TERMINAL) break;
+ a -> sister -> r_cap += bottleneck;
+ a -> r_cap -= bottleneck;
+ if (!a->r_cap)
+ {
+ set_orphan_front(i); // add i to the beginning of the adoption list
+ }
+ }
+ i -> tr_cap += bottleneck;
+ if (!i->tr_cap)
+ {
+ set_orphan_front(i); // add i to the beginning of the adoption list
+ }
+
+
+ flow += bottleneck;
+}
+
+/***********************************************************************/
+
+template <typename captype, typename tcaptype, typename flowtype>
+ void Graph<captype,tcaptype,flowtype>::process_source_orphan(node *i)
+{
+ node *j;
+ arc *a0, *a0_min = NULL, *a;
+ int d, d_min = INFINITE_D;
+
+ /* trying to find a new parent */
+ for (a0=i->first; a0; a0=a0->next)
+ if (a0->sister->r_cap)
+ {
+ j = a0 -> head;
+ if (!j->is_sink && (a=j->parent))
+ {
+ /* checking the origin of j */
+ d = 0;
+ while ( 1 )
+ {
+ if (j->TS == TIME)
+ {
+ d += j -> DIST;
+ break;
+ }
+ a = j -> parent;
+ d ++;
+ if (a==TERMINAL)
+ {
+ j -> TS = TIME;
+ j -> DIST = 1;
+ break;
+ }
+ if (a==ORPHAN) { d = INFINITE_D; break; }
+ j = a -> head;
+ }
+ if (d<INFINITE_D) /* j originates from the source - done */
+ {
+ if (d<d_min)
+ {
+ a0_min = a0;
+ d_min = d;
+ }
+ /* set marks along the path */
+ for (j=a0->head; j->TS!=TIME; j=j->parent->head)
+ {
+ j -> TS = TIME;
+ j -> DIST = d --;
+ }
+ }
+ }
+ }
+
+ // GW: the original code gave a warning here, because the
+ // assignment was without parentheis
+ if ((i->parent = a0_min))
+ {
+ i -> TS = TIME;
+ i -> DIST = d_min + 1;
+ }
+ else
+ {
+ /* no parent is found */
+ add_to_changed_list(i);
+
+ /* process neighbors */
+ for (a0=i->first; a0; a0=a0->next)
+ {
+ j = a0 -> head;
+ if (!j->is_sink && (a=j->parent))
+ {
+ if (a0->sister->r_cap) set_active(j);
+ if (a!=TERMINAL && a!=ORPHAN && a->head==i)
+ {
+ set_orphan_rear(j); // add j to the end of the adoption list
+ }
+ }
+ }
+ }
+}
+
+template <typename captype, typename tcaptype, typename flowtype>
+ void Graph<captype,tcaptype,flowtype>::process_sink_orphan(node *i)
+{
+ node *j;
+ arc *a0, *a0_min = NULL, *a;
+ int d, d_min = INFINITE_D;
+
+ /* trying to find a new parent */
+ for (a0=i->first; a0; a0=a0->next)
+ if (a0->r_cap)
+ {
+ j = a0 -> head;
+ if (j->is_sink && (a=j->parent))
+ {
+ /* checking the origin of j */
+ d = 0;
+ while ( 1 )
+ {
+ if (j->TS == TIME)
+ {
+ d += j -> DIST;
+ break;
+ }
+ a = j -> parent;
+ d ++;
+ if (a==TERMINAL)
+ {
+ j -> TS = TIME;
+ j -> DIST = 1;
+ break;
+ }
+ if (a==ORPHAN) { d = INFINITE_D; break; }
+ j = a -> head;
+ }
+ if (d<INFINITE_D) /* j originates from the sink - done */
+ {
+ if (d<d_min)
+ {
+ a0_min = a0;
+ d_min = d;
+ }
+ /* set marks along the path */
+ for (j=a0->head; j->TS!=TIME; j=j->parent->head)
+ {
+ j -> TS = TIME;
+ j -> DIST = d --;
+ }
+ }
+ }
+ }
+
+ // GW: the original code gave a warning here, because the
+ // assignment was without parentheis
+
+
+ if ((i->parent = a0_min))
+ {
+ i -> TS = TIME;
+ i -> DIST = d_min + 1;
+ }
+ else
+ {
+ /* no parent is found */
+ add_to_changed_list(i);
+
+ /* process neighbors */
+ for (a0=i->first; a0; a0=a0->next)
+ {
+ j = a0 -> head;
+ if (j->is_sink && (a=j->parent))
+ {
+ if (a0->r_cap) set_active(j);
+ if (a!=TERMINAL && a!=ORPHAN && a->head==i)
+ {
+ set_orphan_rear(j); // add j to the end of the adoption list
+ }
+ }
+ }
+ }
+}
+
+/***********************************************************************/
+
+template <typename captype, typename tcaptype, typename flowtype>
+ flowtype Graph<captype,tcaptype,flowtype>::maxflow(bool reuse_trees, Block<node_id>* _changed_list)
+{
+ node *i, *j, *current_node = NULL;
+ arc *a;
+ nodeptr *np, *np_next;
+
+ if (!nodeptr_block)
+ {
+ nodeptr_block = new DBlock<nodeptr>(NODEPTR_BLOCK_SIZE, error_function);
+ }
+
+ changed_list = _changed_list;
+ if (maxflow_iteration == 0 && reuse_trees) { if (error_function) (*error_function)("reuse_trees cannot be used in the first call to maxflow()!"); exit(1); }
+ if (changed_list && !reuse_trees) { if (error_function) (*error_function)("changed_list cannot be used without reuse_trees!"); exit(1); }
+
+ if (reuse_trees) maxflow_reuse_trees_init();
+ else maxflow_init();
+
+ // main loop
+ while ( 1 )
+ {
+ // test_consistency(current_node);
+
+ if ((i=current_node))
+ {
+ i -> next = NULL; /* remove active flag */
+ if (!i->parent) i = NULL;
+ }
+ if (!i)
+ {
+ if (!(i = next_active())) break;
+ }
+
+ /* growth */
+ if (!i->is_sink)
+ {
+ /* grow source tree */
+ for (a=i->first; a; a=a->next)
+ if (a->r_cap)
+ {
+ j = a -> head;
+ if (!j->parent)
+ {
+ j -> is_sink = 0;
+ j -> parent = a -> sister;
+ j -> TS = i -> TS;
+ j -> DIST = i -> DIST + 1;
+ set_active(j);
+ add_to_changed_list(j);
+ }
+ else if (j->is_sink) break;
+ else if (j->TS <= i->TS &&
+ j->DIST > i->DIST)
+ {
+ /* heuristic - trying to make the distance from j to the source shorter */
+ j -> parent = a -> sister;
+ j -> TS = i -> TS;
+ j -> DIST = i -> DIST + 1;
+ }
+ }
+ }
+ else
+ {
+ /* grow sink tree */
+ for (a=i->first; a; a=a->next)
+ if (a->sister->r_cap)
+ {
+ j = a -> head;
+ if (!j->parent)
+ {
+ j -> is_sink = 1;
+ j -> parent = a -> sister;
+ j -> TS = i -> TS;
+ j -> DIST = i -> DIST + 1;
+ set_active(j);
+ add_to_changed_list(j);
+ }
+ else if (!j->is_sink) { a = a -> sister; break; }
+ else if (j->TS <= i->TS &&
+ j->DIST > i->DIST)
+ {
+ /* heuristic - trying to make the distance from j to the sink shorter */
+ j -> parent = a -> sister;
+ j -> TS = i -> TS;
+ j -> DIST = i -> DIST + 1;
+ }
+ }
+ }
+
+ TIME ++;
+
+ if (a)
+ {
+ i -> next = i; /* set active flag */
+ current_node = i;
+
+ /* augmentation */
+ augment(a);
+ /* augmentation end */
+
+ /* adoption */
+ while ((np=orphan_first))
+ {
+ np_next = np -> next;
+ np -> next = NULL;
+
+ while ((np=orphan_first))
+ {
+ orphan_first = np -> next;
+ i = np -> ptr;
+ nodeptr_block -> Delete(np);
+ if (!orphan_first) orphan_last = NULL;
+ if (i->is_sink) process_sink_orphan(i);
+ else process_source_orphan(i);
+ }
+
+ orphan_first = np_next;
+ }
+ /* adoption end */
+ }
+ else current_node = NULL;
+ }
+ // test_consistency();
+
+ if (!reuse_trees || (maxflow_iteration % 64) == 0)
+ {
+ delete nodeptr_block;
+ nodeptr_block = NULL;
+ }
+
+ maxflow_iteration ++;
+ return flow;
+}
+
+/***********************************************************************/
+
+
+template <typename captype, typename tcaptype, typename flowtype>
+ void Graph<captype,tcaptype,flowtype>::test_consistency(node* current_node)
+{
+ node *i;
+ arc *a;
+ int r;
+ int num1 = 0, num2 = 0;
+
+ // test whether all nodes i with i->next!=NULL are indeed in the queue
+ for (i=nodes; i<node_last; i++)
+ {
+ if (i->next || i==current_node) num1 ++;
+ }
+ for (r=0; r<3; r++)
+ {
+ i = (r == 2) ? current_node : queue_first[r];
+ if (i)
+ for ( ; ; i=i->next)
+ {
+ num2 ++;
+ if (i->next == i)
+ {
+ if (r<2) assert(i == queue_last[r]);
+ else assert(i == current_node);
+ break;
+ }
+ }
+ }
+ assert(num1 == num2);
+
+ for (i=nodes; i<node_last; i++)
+ {
+ // test whether all edges in seach trees are non-saturated
+ if (i->parent == NULL) {}
+ else if (i->parent == ORPHAN) {}
+ else if (i->parent == TERMINAL)
+ {
+ if (!i->is_sink) assert(i->tr_cap > 0);
+ else assert(i->tr_cap < 0);
+ }
+ else
+ {
+ if (!i->is_sink) assert (i->parent->sister->r_cap > 0);
+ else assert (i->parent->r_cap > 0);
+ }
+ // test whether passive nodes in search trees have neighbors in
+ // a different tree through non-saturated edges
+ if (i->parent && !i->next)
+ {
+ if (!i->is_sink)
+ {
+ assert(i->tr_cap >= 0);
+ for (a=i->first; a; a=a->next)
+ {
+ if (a->r_cap > 0) assert(a->head->parent && !a->head->is_sink);
+ }
+ }
+ else
+ {
+ assert(i->tr_cap <= 0);
+ for (a=i->first; a; a=a->next)
+ {
+ if (a->sister->r_cap > 0) assert(a->head->parent && a->head->is_sink);
+ }
+ }
+ }
+ // test marking invariants
+ if (i->parent && i->parent!=ORPHAN && i->parent!=TERMINAL)
+ {
+ assert(i->TS <= i->parent->head->TS);
+ if (i->TS == i->parent->head->TS) assert(i->DIST > i->parent->head->DIST);
+ }
+ }
+}
+
+} // end namespace maxflow
diff --git a/maxflow/graph.h b/maxflow/graph.h
new file mode 100644
index 0000000..6a6da37
--- /dev/null
+++ b/maxflow/graph.h
@@ -0,0 +1,510 @@
+/* graph.h */
+/*
+ Copyright Vladimir Kolmogorov (vnk at ist.ac.at), Yuri Boykov (yuri at csd.uwo.ca)
+
+ This file is part of MAXFLOW.
+
+ MAXFLOW is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ MAXFLOW is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with MAXFLOW. If not, see <http://www.gnu.org/licenses/>.
+
+========================
+
+ version 3.03
+
+ This software library implements the maxflow algorithm
+ described in
+
+ "An Experimental Comparison of Min-Cut/Max-Flow Algorithms for Energy Minimization in Vision."
+ Yuri Boykov and Vladimir Kolmogorov.
+ In IEEE Transactions on Pattern Analysis and Machine Intelligence (PAMI),
+ September 2004
+
+ This algorithm was developed by Yuri Boykov and Vladimir Kolmogorov
+ at Siemens Corporate Research. To make it available for public use,
+ it was later reimplemented by Vladimir Kolmogorov based on open publications.
+
+ If you use this software for research purposes, you should cite
+ the aforementioned paper in any resulting publication.
+
+ ----------------------------------------------------------------------
+
+ REUSING TREES:
+
+ Starting with version 3.0, there is a also an option of reusing search
+ trees from one maxflow computation to the next, as described in
+
+ "Efficiently Solving Dynamic Markov Random Fields Using Graph Cuts."
+ Pushmeet Kohli and Philip H.S. Torr
+ International Conference on Computer Vision (ICCV), 2005
+
+ If you use this option, you should cite
+ the aforementioned paper in any resulting publication.
+*/
+
+
+
+/*
+ For description, license, example usage see README.TXT.
+*/
+
+#ifndef __GRAPH_H__
+#define __GRAPH_H__
+
+#include <string.h>
+#include "block.h"
+
+#include <assert.h>
+// NOTE: in UNIX you need to use -DNDEBUG preprocessor option to supress assert's!!!
+
+
+namespace maxflow {
+
+// captype: type of edge capacities (excluding t-links)
+// tcaptype: type of t-links (edges between nodes and terminals)
+// flowtype: type of total flow
+//
+// Current instantiations are in instances.inc
+template <typename captype, typename tcaptype, typename flowtype> class Graph
+{
+public:
+ typedef enum
+ {
+ SOURCE = 0,
+ SINK = 1
+ } termtype; // terminals
+ typedef int node_id;
+
+ /////////////////////////////////////////////////////////////////////////
+ // BASIC INTERFACE FUNCTIONS //
+ // (should be enough for most applications) //
+ /////////////////////////////////////////////////////////////////////////
+
+ // Constructor.
+ // The first argument gives an estimate of the maximum number of nodes that can be added
+ // to the graph, and the second argument is an estimate of the maximum number of edges.
+ // The last (optional) argument is the pointer to the function which will be called
+ // if an error occurs; an error message is passed to this function.
+ // If this argument is omitted, exit(1) will be called.
+ //
+ // IMPORTANT: It is possible to add more nodes to the graph than node_num_max
+ // (and node_num_max can be zero). However, if the count is exceeded, then
+ // the internal memory is reallocated (increased by 50%) which is expensive.
+ // Also, temporarily the amount of allocated memory would be more than twice than needed.
+ // Similarly for edges.
+ // If you wish to avoid this overhead, you can download version 2.2, where nodes and edges are stored in blocks.
+ Graph(int node_num_max, int edge_num_max, void (*err_function)(const char *) = NULL);
+
+ // Destructor
+ ~Graph();
+
+ // Adds node(s) to the graph. By default, one node is added (num=1); then first call returns 0, second call returns 1, and so on.
+ // If num>1, then several nodes are added, and node_id of the first one is returned.
+ // IMPORTANT: see note about the constructor
+ node_id add_node(int num = 1);
+
+ // Adds a bidirectional edge between 'i' and 'j' with the weights 'cap' and 'rev_cap'.
+ // IMPORTANT: see note about the constructor
+ void add_edge(node_id i, node_id j, captype cap, captype rev_cap);
+
+ // Adds new edges 'SOURCE->i' and 'i->SINK' with corresponding weights.
+ // Can be called multiple times for each node.
+ // Weights can be negative.
+ // NOTE: the number of such edges is not counted in edge_num_max.
+ // No internal memory is allocated by this call.
+ void add_tweights(node_id i, tcaptype cap_source, tcaptype cap_sink);
+
+
+ // Computes the maxflow. Can be called several times.
+ // FOR DESCRIPTION OF reuse_trees, SEE mark_node().
+ // FOR DESCRIPTION OF changed_list, SEE remove_from_changed_list().
+ flowtype maxflow(bool reuse_trees = false, Block<node_id>* changed_list = NULL);
+
+ // After the maxflow is computed, this function returns to which
+ // segment the node 'i' belongs (Graph<captype,tcaptype,flowtype>::SOURCE or Graph<captype,tcaptype,flowtype>::SINK).
+ //
+ // Occasionally there may be several minimum cuts. If a node can be assigned
+ // to both the source and the sink, then default_segm is returned.
+ termtype what_segment(node_id i, termtype default_segm = SOURCE) const;
+
+
+
+ //////////////////////////////////////////////
+ // ADVANCED INTERFACE FUNCTIONS //
+ // (provide access to the graph) //
+ //////////////////////////////////////////////
+
+private:
+ struct node;
+ struct arc;
+
+public:
+
+ ////////////////////////////
+ // 1. Reallocating graph. //
+ ////////////////////////////
+
+ // Removes all nodes and edges.
+ // After that functions add_node() and add_edge() must be called again.
+ //
+ // Advantage compared to deleting Graph and allocating it again:
+ // no calls to delete/new (which could be quite slow).
+ //
+ // If the graph structure stays the same, then an alternative
+ // is to go through all nodes/edges and set new residual capacities
+ // (see functions below).
+ void reset();
+
+ ////////////////////////////////////////////////////////////////////////////////
+ // 2. Functions for getting pointers to arcs and for reading graph structure. //
+ // NOTE: adding new arcs may invalidate these pointers (if reallocation //
+ // happens). So it's best not to add arcs while reading graph structure. //
+ ////////////////////////////////////////////////////////////////////////////////
+
+ // The following two functions return arcs in the same order that they
+ // were added to the graph. NOTE: for each call add_edge(i,j,cap,cap_rev)
+ // the first arc returned will be i->j, and the second j->i.
+ // If there are no more arcs, then the function can still be called, but
+ // the returned arc_id is undetermined.
+ typedef arc* arc_id;
+ arc_id get_first_arc();
+ arc_id get_next_arc(arc_id a);
+
+ // other functions for reading graph structure
+ int get_node_num() { return node_num; }
+ int get_arc_num() { return (int)(arc_last - arcs); }
+ void get_arc_ends(arc_id a, node_id& i, node_id& j); // returns i,j to that a = i->j
+
+ ///////////////////////////////////////////////////
+ // 3. Functions for reading residual capacities. //
+ ///////////////////////////////////////////////////
+
+ // returns residual capacity of SOURCE->i minus residual capacity of i->SINK
+ tcaptype get_trcap(node_id i);
+ // returns residual capacity of arc a
+ captype get_rcap(arc* a);
+
+ /////////////////////////////////////////////////////////////////
+ // 4. Functions for setting residual capacities. //
+ // NOTE: If these functions are used, the value of the flow //
+ // returned by maxflow() will not be valid! //
+ /////////////////////////////////////////////////////////////////
+
+ void set_trcap(node_id i, tcaptype trcap);
+ void set_rcap(arc* a, captype rcap);
+
+ ////////////////////////////////////////////////////////////////////
+ // 5. Functions related to reusing trees & list of changed nodes. //
+ ////////////////////////////////////////////////////////////////////
+
+ // If flag reuse_trees is true while calling maxflow(), then search trees
+ // are reused from previous maxflow computation.
+ // In this case before calling maxflow() the user must
+ // specify which parts of the graph have changed by calling mark_node():
+ // add_tweights(i),set_trcap(i) => call mark_node(i)
+ // add_edge(i,j),set_rcap(a) => call mark_node(i); mark_node(j)
+ //
+ // This option makes sense only if a small part of the graph is changed.
+ // The initialization procedure goes only through marked nodes then.
+ //
+ // mark_node(i) can either be called before or after graph modification.
+ // Can be called more than once per node, but calls after the first one
+ // do not have any effect.
+ //
+ // NOTE:
+ // - This option cannot be used in the first call to maxflow().
+ // - It is not necessary to call mark_node() if the change is ``not essential'',
+ // i.e. sign(trcap) is preserved for a node and zero/nonzero status is preserved for an arc.
+ // - To check that you marked all necessary nodes, you can call maxflow(false) after calling maxflow(true).
+ // If everything is correct, the two calls must return the same value of flow. (Useful for debugging).
+ void mark_node(node_id i);
+
+ // If changed_list is not NULL while calling maxflow(), then the algorithm
+ // keeps a list of nodes which could potentially have changed their segmentation label.
+ // Nodes which are not in the list are guaranteed to keep their old segmentation label (SOURCE or SINK).
+ // Example usage:
+ //
+ // typedef Graph<int,int,int> G;
+ // G* g = new Graph(nodeNum, edgeNum);
+ // Block<G::node_id>* changed_list = new Block<G::node_id>(128);
+ //
+ // ... // add nodes and edges
+ //
+ // g->maxflow(); // first call should be without arguments
+ // for (int iter=0; iter<10; iter++)
+ // {
+ // ... // change graph, call mark_node() accordingly
+ //
+ // g->maxflow(true, changed_list);
+ // G::node_id* ptr;
+ // for (ptr=changed_list->ScanFirst(); ptr; ptr=changed_list->ScanNext())
+ // {
+ // G::node_id i = *ptr; assert(i>=0 && i<nodeNum);
+ // g->remove_from_changed_list(i);
+ // // do something with node i...
+ // if (g->what_segment(i) == G::SOURCE) { ... }
+ // }
+ // changed_list->Reset();
+ // }
+ // delete changed_list;
+ //
+ // NOTE:
+ // - If changed_list option is used, then reuse_trees must be used as well.
+ // - In the example above, the user may omit calls g->remove_from_changed_list(i) and changed_list->Reset() in a given iteration.
+ // Then during the next call to maxflow(true, &changed_list) new nodes will be added to changed_list.
+ // - If the next call to maxflow() does not use option reuse_trees, then calling remove_from_changed_list()
+ // is not necessary. ("changed_list->Reset()" or "delete changed_list" should still be called, though).
+ void remove_from_changed_list(node_id i)
+ {
+ assert(i>=0 && i<node_num && nodes[i].is_in_changed_list);
+ nodes[i].is_in_changed_list = 0;
+ }
+
+
+
+
+
+
+/////////////////////////////////////////////////////////////////////////
+/////////////////////////////////////////////////////////////////////////
+/////////////////////////////////////////////////////////////////////////
+
+private:
+ // internal variables and functions
+
+ struct node
+ {
+ arc *first; // first outcoming arc
+
+ arc *parent; // node's parent
+ node *next; // pointer to the next active node
+ // (or to itself if it is the last node in the list)
+ int TS; // timestamp showing when DIST was computed
+ int DIST; // distance to the terminal
+ int is_sink : 1; // flag showing whether the node is in the source or in the sink tree (if parent!=NULL)
+ int is_marked : 1; // set by mark_node()
+ int is_in_changed_list : 1; // set by maxflow if
+
+ tcaptype tr_cap; // if tr_cap > 0 then tr_cap is residual capacity of the arc SOURCE->node
+ // otherwise -tr_cap is residual capacity of the arc node->SINK
+
+ };
+
+ struct arc
+ {
+ node *head; // node the arc points to
+ arc *next; // next arc with the same originating node
+ arc *sister; // reverse arc
+
+ captype r_cap; // residual capacity
+ };
+
+ struct nodeptr
+ {
+ node *ptr;
+ nodeptr *next;
+ };
+ static const int NODEPTR_BLOCK_SIZE = 128;
+
+ node *nodes, *node_last, *node_max; // node_last = nodes+node_num, node_max = nodes+node_num_max;
+ arc *arcs, *arc_last, *arc_max; // arc_last = arcs+2*edge_num, arc_max = arcs+2*edge_num_max;
+
+ int node_num;
+
+ DBlock<nodeptr> *nodeptr_block;
+
+ void (*error_function)(const char *); // this function is called if a error occurs,
+ // with a corresponding error message
+ // (or exit(1) is called if it's NULL)
+
+ flowtype flow; // total flow
+
+ // reusing trees & list of changed pixels
+ int maxflow_iteration; // counter
+ Block<node_id> *changed_list;
+
+ /////////////////////////////////////////////////////////////////////////
+
+ node *queue_first[2], *queue_last[2]; // list of active nodes
+ nodeptr *orphan_first, *orphan_last; // list of pointers to orphans
+ int TIME; // monotonically increasing global counter
+
+ /////////////////////////////////////////////////////////////////////////
+
+ void reallocate_nodes(int num); // num is the number of new nodes
+ void reallocate_arcs();
+
+ // functions for processing active list
+ void set_active(node *i);
+ node *next_active();
+
+ // functions for processing orphans list
+ void set_orphan_front(node* i); // add to the beginning of the list
+ void set_orphan_rear(node* i); // add to the end of the list
+
+ void add_to_changed_list(node* i);
+
+ void maxflow_init(); // called if reuse_trees == false
+ void maxflow_reuse_trees_init(); // called if reuse_trees == true
+ void augment(arc *middle_arc);
+ void process_source_orphan(node *i);
+ void process_sink_orphan(node *i);
+
+ void test_consistency(node* current_node=NULL); // debug function
+};
+
+
+
+///////////////////////////////////////
+// Implementation - inline functions //
+///////////////////////////////////////
+
+
+
+template <typename captype, typename tcaptype, typename flowtype>
+ inline typename Graph<captype,tcaptype,flowtype>::node_id Graph<captype,tcaptype,flowtype>::add_node(int num)
+{
+ assert(num > 0);
+
+ if (node_last + num > node_max) reallocate_nodes(num);
+
+ memset(node_last, 0, num*sizeof(node));
+
+ node_id i = node_num;
+ node_num += num;
+ node_last += num;
+ return i;
+}
+
+template <typename captype, typename tcaptype, typename flowtype>
+ inline void Graph<captype,tcaptype,flowtype>::add_tweights(node_id i, tcaptype cap_source, tcaptype cap_sink)
+{
+ assert(i >= 0 && i < node_num);
+
+ tcaptype delta = nodes[i].tr_cap;
+ if (delta > 0) cap_source += delta;
+ else cap_sink -= delta;
+ flow += (cap_source < cap_sink) ? cap_source : cap_sink;
+ nodes[i].tr_cap = cap_source - cap_sink;
+}
+
+template <typename captype, typename tcaptype, typename flowtype>
+ inline void Graph<captype,tcaptype,flowtype>::add_edge(node_id _i, node_id _j, captype cap, captype rev_cap)
+{
+ assert(_i >= 0 && _i < node_num);
+ assert(_j >= 0 && _j < node_num);
+ assert(_i != _j);
+ assert(cap >= 0);
+ assert(rev_cap >= 0);
+
+ if (arc_last == arc_max) reallocate_arcs();
+
+ arc *a = arc_last ++;
+ arc *a_rev = arc_last ++;
+
+ node* i = nodes + _i;
+ node* j = nodes + _j;
+
+ a -> sister = a_rev;
+ a_rev -> sister = a;
+ a -> next = i -> first;
+ i -> first = a;
+ a_rev -> next = j -> first;
+ j -> first = a_rev;
+ a -> head = j;
+ a_rev -> head = i;
+ a -> r_cap = cap;
+ a_rev -> r_cap = rev_cap;
+}
+
+template <typename captype, typename tcaptype, typename flowtype>
+ inline typename Graph<captype,tcaptype,flowtype>::arc* Graph<captype,tcaptype,flowtype>::get_first_arc()
+{
+ return arcs;
+}
+
+template <typename captype, typename tcaptype, typename flowtype>
+ inline typename Graph<captype,tcaptype,flowtype>::arc* Graph<captype,tcaptype,flowtype>::get_next_arc(arc* a)
+{
+ return a + 1;
+}
+
+template <typename captype, typename tcaptype, typename flowtype>
+ inline void Graph<captype,tcaptype,flowtype>::get_arc_ends(arc* a, node_id& i, node_id& j)
+{
+ assert(a >= arcs && a < arc_last);
+ i = (node_id) (a->sister->head - nodes);
+ j = (node_id) (a->head - nodes);
+}
+
+template <typename captype, typename tcaptype, typename flowtype>
+ inline tcaptype Graph<captype,tcaptype,flowtype>::get_trcap(node_id i)
+{
+ assert(i>=0 && i<node_num);
+ return nodes[i].tr_cap;
+}
+
+template <typename captype, typename tcaptype, typename flowtype>
+ inline captype Graph<captype,tcaptype,flowtype>::get_rcap(arc* a)
+{
+ assert(a >= arcs && a < arc_last);
+ return a->r_cap;
+}
+
+template <typename captype, typename tcaptype, typename flowtype>
+ inline void Graph<captype,tcaptype,flowtype>::set_trcap(node_id i, tcaptype trcap)
+{
+ assert(i>=0 && i<node_num);
+ nodes[i].tr_cap = trcap;
+}
+
+template <typename captype, typename tcaptype, typename flowtype>
+ inline void Graph<captype,tcaptype,flowtype>::set_rcap(arc* a, captype rcap)
+{
+ assert(a >= arcs && a < arc_last);
+ a->r_cap = rcap;
+}
+
+
+template <typename captype, typename tcaptype, typename flowtype>
+ inline typename Graph<captype,tcaptype,flowtype>::termtype Graph<captype,tcaptype,flowtype>::what_segment(node_id i, termtype default_segm) const
+{
+ if (nodes[i].parent)
+ {
+ return (nodes[i].is_sink) ? SINK : SOURCE;
+ }
+ else
+ {
+ return default_segm;
+ }
+}
+
+template <typename captype, typename tcaptype, typename flowtype>
+ inline void Graph<captype,tcaptype,flowtype>::mark_node(node_id _i)
+{
+ node* i = nodes + _i;
+ if (!i->next)
+ {
+ /* it's not in the list yet */
+ if (queue_last[1]) queue_last[1] -> next = i;
+ else queue_first[1] = i;
+ queue_last[1] = i;
+ i -> next = i;
+ }
+ i->is_marked = 1;
+}
+
+
+
+} // end namespace
+
+#endif
diff --git a/test_maxflow.cpp b/test_maxflow.cpp
new file mode 100644
index 0000000..48f5e61
--- /dev/null
+++ b/test_maxflow.cpp
@@ -0,0 +1,207 @@
+/*
+ This file is part of MAXFLOW.
+
+ MAXFLOW is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ MAXFLOW is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with MAXFLOW. If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+
+// Implement some simple tests for maxflow
+
+#include <iostream>
+#include <maxflow.h>
+
+using std::cerr;
+using std::pair;
+using std::make_pair;
+using maxflow::Graph_III;
+
+int test_node(const Graph_III& g, int id, Graph_III::termtype segment, const char *testid)
+{
+ if (g.what_segment(id) != segment) {
+ cerr << testid << "Node " << id << "not es expected in "
+ << (segment == Graph_III::SOURCE ? "Source" : "Sink")
+ << " set\n";
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ Test the following graph:
+
+ SOURCE
+ / \
+ 5/ \2
+ / 3 \
+ node0 -----> node1
+ | <----- |
+ | 4 |
+ \ /
+ 1\ /6
+ \ /
+ SINK
+
+ flow = 6
+ node 0 = source
+ node 1 = sink
+*/
+
+
+
+pair<int,int> test_1()
+{
+ Graph_III g(2,1);
+
+ g.add_node();
+ g.add_node();
+
+ g.add_tweights( 0, /* capacities */ 5, 1 );
+ g.add_tweights( 1, /* capacities */ 2, 6 );
+ g.add_edge( 0, 1, /* capacities */ 3, 4 );
+
+ int flow = g.maxflow();
+
+ pair<int,int> result = make_pair(0, 3);
+ if (flow != 6) {
+ cerr << "test_1: Flow = " << flow << ", " << "expected 6\n";
+ ++result.first;
+ }
+
+ result.first += test_node(g, 0, Graph_III::SOURCE, "test_1");
+ result.first += test_node(g, 1, Graph_III::SINK, "test_1");
+ return result;
+}
+
+
+/*
+ Test the following graph:
+
+ SOURCE
+ / \
+ 1/ \2
+ / 3 \
+ node0 -----> node1
+ | <----- |
+ | 4 |
+ \ /
+ 5\ /6
+ \ /
+ SINK
+
+ flow = 3
+ node 0 = sink
+ node 1 = sink
+*/
+
+
+
+pair<int,int> test_2()
+{
+ Graph_III g(2,1);
+
+ g.add_node();
+ g.add_node();
+
+ g.add_tweights( 0, /* capacities */ 1, 5 );
+ g.add_tweights( 1, /* capacities */ 2, 6 );
+ g.add_edge( 0, 1, /* capacities */ 3, 4 );
+
+ int flow = g.maxflow();
+
+ pair<int,int> result = make_pair(0, 3);
+ if (flow != 3) {
+ cerr << "test_2: Flow = " << flow << ", " << "expected 3\n";
+ ++result.first;
+ }
+
+ result.first += test_node(g, 0, Graph_III::SINK, "test_2");
+ result.first += test_node(g, 1, Graph_III::SINK, "test_2");
+
+ return result;
+}
+
+
+/*
+ Test the following graph:
+
+ ---- SOURCE------
+ / \
+ 6/ \ 4
+ / 4 3 \
+ node0 -----> node1 ---->node2
+ | <----- <----- /
+ | 2 5 |
+ \ /
+ 3\ /6
+ \ /
+ SINK
+
+ flow = 9
+ node 0 = source
+ node 1 = sink
+ node 2 = sink
+*/
+
+
+
+pair<int,int> test_3()
+{
+ Graph_III g(3,2);
+
+ g.add_node();
+ g.add_node();
+ g.add_node();
+
+ g.add_tweights( 0, /* capacities */ 6, 4 );
+ g.add_tweights( 2, /* capacities */ 3, 6 );
+ g.add_edge( 0, 1, /* capacities */ 2, 4 );
+ g.add_edge( 1, 2, /* capacities */ 3, 5 );
+
+ int flow = g.maxflow();
+
+ pair<int,int> result = make_pair(0,4);
+
+ if (flow != 9) {
+ cerr << "test_2: Flow = " << flow << ", " << "expected 9\n";
+ ++result.first;
+ }
+
+ result.first += test_node(g, 0, Graph_III::SOURCE, "test_3");
+ result.first += test_node(g, 1, Graph_III::SINK, "test_3");
+ result.first += test_node(g, 2, Graph_III::SINK, "test_3");
+
+ return result;
+}
+
+pair<int,int>& operator += (pair<int,int>& lhs, const pair<int,int>& rhs)
+{
+ lhs.first += rhs.first;
+ lhs.second += rhs.second;
+ return lhs;
+}
+
+int main()
+{
+ pair<int,int> failures = make_pair<int, int>(0,0);
+
+ failures += test_1();
+ failures += test_2();
+ failures += test_3();
+
+ cerr << failures.first << " of " << failures.second << " test failed\n";
+
+ return failures.first > 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}
+
--
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