ortools
Google OR-Tools python libraries and modules
Description
This project hosts operations research tools developed at Google and made available as open source under the Apache 2.0 License. OR-Tools includes solvers for: - Constraint Programming - CP-SAT solver: A constraint programming solver that uses SAT (satisfiability) methods. - Original CP solver: A constraint programming solver. - Linear and Mixed-Integer Programming - Glop: A linear optimizer to find the optimal value of a linear objective function, given a set of linear inequalities as constraints. - MPSolver, ModelBuilder: Wrappers around commercial and other open source solvers, including mixed integer solvers: CBC, CLP, GLPK, Gurobi or SCIP. - Vehicle Routing A specialized library for identifying best vehicle routes given constraints. - Graph Algorithms Code for finding shortest paths in graphs, min-cost flows, max flows, and linear sum assignments.
Release History
| Version | Changes | Urgency | Date |
|---|---|---|---|
| 9.15.6755 | Imported from PyPI (9.15.6755) | Low | 4/21/2026 |
| v9.15 | # What's Changed ## Platforms * Add Python 3.14 support. ## Dependencies ### C++ * abseil-cpp=20250814.1 * Protobuf=v33.1 * HiGHS=v1.12.0 * SCIP=v10.0.0 * **NEW** XPressMP is supported in MathOpt. It will automatically load the XPressMP shared library on your computer ## Routing * Improved routing performance and search event support (at optimal). * Improved Doxygen documentation. * Reworked routing samples (#4590). * Exported filters update and other improvements from main. | Low | 1/12/2026 |
| v9.14 | ## Dependencies * Bump Protobuf to v31.1 ## What's Changed * MacOS libscip linkage issue has been fixed #4674 * CFT Heuristic for Set Covering by @c4v4 in https://github.com/google/or-tools/pull/4607 * [Set-Cover-CFT] Outer Refinement Procedure by @c4v4 in https://github.com/google/or-tools/pull/4628 * Fix bz2.dll install path for windows-cpp archive by @flomnes in https://github.com/google/or-tools/pull/4685 ## New Contributors * @c4v4 made their first contribution in https://gith | Low | 6/19/2025 |
| v9.13 | # What's Changed ## Platforms * Drop Python 3.8 support * Drop .Net 6.0 support * Migrate to .Net 8.0 as TFM in archives and nuget package * Add Fedora 42 support. * Java: may drop Java 8 in favor of Java 11 as minimum supported. ## Dependencies ### C++ * abseil-cpp 20250512.0 * Protobuf v31.0 * HiGHS v1.10.0 * SCIP v922 ### Python * Add typing-extensions dependencies ## CP-SAT * Improvements to the no_overlap_2d constraint (presolve, propagation, and cuts) * Speedup fea | Low | 6/6/2025 |
| v9.12 | # Platforms * This will be the last release to support Python3.8. * Add Python 3.13 support. * Add muslinux wheel package. * This will be the last release to support Java 1.8 # Builds * dependencies (protobuf, abseil, re2, highs) are now seperated shared libraries * Windows libraries are now dll # Dependencies ## C++ * Protobuf 29.3 * CoinUtils: 2.11.12 * Osi: 0.108.11 * Clp: 1.17.10 * Cgl: 0.60.9 * Cbc: 2.10.12 * HiGHS: 1.9.0 * Scip: v920 * benchmark: 1.9.1 # G | Low | 2/17/2025 |
| v9.11 | # Platforms * Add Almalinux 9 support. * Add Rockylinux 9 support. * Add Ubuntu 24.04 LTS support. # Dependencies ## C++ * abseil-cpp: `20240722.0`. * HiGHS: `1.7.2`. * googletest: `v1.15.2`. * Add support for Gurobi 11.0.3 ## Java * maven 3.6+ # Algorithms * Add experimental `set_cover` python binding. # CP-SAT * Improve `no_overlap_2d`, linear propagation ## What's Changed * Updates for OpenBSD build support by @ron-at-swgy in https://github.com/google/o | Low | 9/13/2024 |
| v9.10 | ## Dependencies * ZLIB `1.3.1`. * abseil-cpp `20240116.2`. * Protobuf `v26.1`. * Re2 `2024-04-01`. * HiGHS `v1.7.0`. * Scip `v900`. * Add support for Gurobi 11. ## C++ Changes * replace `std::vector&` with `absl::Span`. * replace `const std::string&` with `absl::string_view`. * Improve XPRESS support. * Remove the command line flags `--logtostderr` which was a no-op since the implementation of the logging module in abseil. Please use `--stderrthreshold=0` instead. ## Algor | Low | 5/8/2024 |
| v9.9 | ## Dependencies * abseil-cpp `20240116.1`. * re2 `2024-02-01`. * Protobuf `v25.3`. * Scip `v810`. * pybind11 `v2.11.1`. * googletest `1.14.0`. ## C++ Changes * use of `absl::Span` instead of `std::vector`. * replace `const std::string&` with `absl::string_view`. * use of absl log. ## CP-SAT * Improvements to no_overlap_2d algorithms. * rewrite python API to be pep8 compliant. `model.AddBoolOr` -> `model.add_bool_or` * Improve the linear propagator code. * Use the `~` o | Low | 3/7/2024 |
| v9.8 | # Platforms * Add Python 3.12 support. * Add Ubuntu 23.10 support. # Dependencies * abseil-cpp `20230802.1`. * Protobuf `v25.0`. * re2 `2023-11-01`. * SCIP `v804`. # Linear Solver * Port `ModelBuilder` to .Net. * Rename `LogCallback` to `MbLogCallback` to avoid collision with SAT LogCallback. * Extend ModelBuilder API: * Add indicator constraints. * Add hinting support. * Add model cloning. # Math Opt * Deep rework. # Routing * Add `ROUTING_OPTIMAL` stat | Low | 11/15/2023 |
| v9.7 | ## Platforms * Drop Fedora [33,36] ([EOL](https://endoflife.date/fedora)). * Drop Centos 8. * Drop Debian 10. * Drop Ubuntu 18.04 LTS. * Drop Python 3.7 support ([EOL](https://devguide.python.org/versions/)). * Disable .Net Core 3.1 ([EOL](https://dotnet.microsoft.com/en-us/platform/support/policy/dotnet-core)) ## Dependencies * ZLIB `1.2.13`. * abseil-cpp `20230125.3`. * Protobuf `v21.12` -> `v23.3`. * re2 `2023-07-01`. * googletest `v1.13.0`. * Java JNA `5.12.1` -> `5.13.0`. | Low | 8/8/2023 |
| v9.6 | # Platforms * Add Fedora 37 support. * Add Fedora 38 support. * Drop Python 3.6 (not supported by `protobuf`). * Drop Python 3.7 on MacOS (not supported by `scipy`). * Add `net7.0` support * Drop `netcore3.1` in nuget .org packages # Dependencies * SCIP `v801` -> `v803` (note: now SCIP use an OSI compatible license) * abseil `20220623.1` -> `20230105.0` * Protobuf `v21.5` -> `v21.12` * SWIG `4.1.1` * Java JNA `5.11.0` -> `5.12.1` # PDLP * Add python wrapper. # CP-SAT * Perf | Low | 3/13/2023 |
| v9.5 | # Platforms * Add Debian-SID support (#3457). * Add Fedora 35 support. * Add Fedora 36 support. * Add Ubuntu 22.10. * Drop Python 3.6 macOS x86_64 (Intel) . * Add Python 3.11 wheel (#3515). # CP-SAT * Presolve improvements: max(array), Boolean constraints, linear constraints. * Interleaved search should be deterministic in parallel. * Linear cuts: cleanup square and int_prod cuts; rewrite cut pipeline. * Fingerprint input model and solution (visible in the log). * Scheduling improv | Low | 11/28/2022 |
| v9.4 | # Platforms * Add Debian-10 support (#3209) * Add Ubuntu 22.04 LTS support (#3276) * note: won't have .Net 3.1 support (see: https://github.com/dotnet/core/issues/7038#issuecomment-1110377345) * Remove Ubuntu 21.10 support # Misc * Split archive by languages and add CMake config to the C++ one (#3200) # Graph Split `ortools.graph.pywrapgraph` into: * `ortools.graph.python.linear_sum_assignment` * `ortools.graph.python.max_flow` * `ortools.graph.python.min_cost_flow` Th | Low | 8/11/2022 |
| v9.3 | # Platform changes * Drop Debian-10 support * Drop Ubuntu-16.04 support * Drop .NET Framework 4.5.2 # Dependencies Update * Add Eigen `3.4.0`. * Add Google re2 `2021-11-01`. * Protobuf `3.19.1` -> `3.19.4`. * SCIP `7.0.1` -> `v800` ## Python * Add pybind11. # Features * Add PDLP as experimental * Add MathOpt as experimental. # CP-SAT * renamed few API for consistency e.g. `LinearExpr.ScalProd` -> `LinearExpr.WeightedSum`. * Add `AddAtLeastOne`/`AddAtMostOne`/`AddExactlyOn | Low | 3/17/2022 |
| v9.2 | # Platform changes * Add support for Ubuntu 21:10 (last rolling release). # Dependencies Update * .Net TFM update `net5.0` -> `net6.0` (need .Net SDK 6.0 LTS and .Net SDK 3.1 LTS). * abseil-cpp `20210324.2` -> `20211102.0`. * Protobuf `3.18.0` -> `3.19.1`. * Googletest `1.10.0` -> `1.11.0`. * Python: add `numpy >= 1.13.3`. * On MacOS compile Coin-OR in `-O1` to avoid crash in runners. # Routing * Improvement on filters. * Improve first solution heuristics. * Improve time break pl | Low | 12/16/2021 |
| v9.1 | # Platform changes * Ubuntu 16.04 LTS is deprecated (https://github.com/actions/virtual-environments/issues/3287). * Add support for Debian 11 (Bullseye). * Add support for Fedora 34. * python: use `manylinux2014` image ([PEP 599](https://www.python.org/dev/peps/pep-0599/)). * python: add support for aarch64 linux using `manylinux2014_aarch64` image. * .Net: add .Net5 support. # Dependencies Update * abseil-cpp `20210324.1` -> `20210324.2`. * Protobuf `3.15.8` -> `3.18.0`. * SCIP `7. | Low | 10/1/2021 |
| v9.0 | # Platform changes * Added support for Centos-7 (#2498) # Dependencies Update * abseil-cpp 20200923.3 -> 20210324.1 (#2523) * Protobuf 3.15.3 -> 3.15.8 (#2524) * Java: jna-platform 5.5.0 -> 5.8.0 (#252) # Features/Fix * Improve multi-threading when using CP-SAT solver (#1588) * Add logger access support in Python, Java and .Net (#2245) * C++: Replace Google type `[u]int(16|32|64)` by cstdint ones (e.g. `uint64_t`) * Python: Fix `std::vector<std::string>` support (#2453) ## Make | Low | 4/30/2021 |
| v8.2 | # Dependency Updates * abseil-cpp 20200923.2 -> 20200923.3 * Protobuf 3.14.0 -> 3.15.3 # Routing * Expose new APIs: * `int RegisterUnaryTransitVector(std::vector<int64>)` and * `int RegisterTransitMatrix(std::vector<std::vector<int64>>)` * Change return of `AddVectorDimension()` and `AddMatrixDimension()` to `std::pair<int, bool>` whose `int` is the transit evaluator id. | Low | 3/3/2021 |
| v8.1 | # Dependency Updates * abseil-cpp 20200923 -> 20200923.2 * Protobuf 3.13.0 -> 3.14.0 * Add support for Gurobi 9.1.0 * drop Glog dependency (replaced by a custom implementation depending on abseil-cpp flags) * drop Gflag dependency (replaced by abseil-cpp flags component) # Bug Fixes * Fix double counting of Gurobi floating license (#2227) * Fix windows build (#2200) | Low | 12/9/2020 |
| v8.0 | # Dependency updates * abseil-cpp 20200225.2 -> 20200923 * Protobuf 3.12.2 -> 3.13.0 # Platform changes * Added support for Python3.9 (#2187) * Dropped support for Python3.5 (#2186) * Added support for Ubuntu 20.10 (#2188) * Dropped support for Ubuntu 16.04 LTS and Ubuntu 19.10 (#2188) # Known Breaking Change * Since last synchronization with Google internal code base, now Routing and SAT (i.e. OR-Tools) use some **C++17**. **WARNING**: If you provide your own version of **abseil | Low | 10/11/2020 |
| v7.8 | # Dependency updates * Gurobi 9.0.2 is now pre-integrated in prebuilt binaries. It will search for the gurobi 90 shared library in the default install path of the Gurobi installers on MAC OS X and Windows, or in the `GUROBI_HOME` directory. * SCIP 7.0.1 is now integrated in prebuilt binaries.Please ensure compliance with the [SCIP license](https://scipopt.org/index.php#license) before using it. * Added support for optional Xpress Solver 8.9.0. # Linear Solver * Added a static `LinearSolve | Low | 8/4/2020 |
| v7.7 | # Dependency updates * Abseil-cpp 20200225 -> 20200225.2 * Protobuf 3.11.4 -> 3.12.2 * bazel-skylib 0.8.0 -> 1.0.2 (for bazel based build) * Fix optional SCIP 7.0 support # CP-SAT Update * Now, the solver returns Optimal instead of Feasible in a satisfiability model (i.e. without objective) * Fix multi-threading crash (#2005) * Improve feasibility pump # CMake * Add maven package generation (#202) * Fix Windows build | Low | 6/12/2020 |
| v7.6 | # Dependency updates * Abseil-cpp 8ba96a8 -> b832dce (LTS 20200225) # CP-SAT Update * Improve cut management * Add debugging tools * Fix UNSAT bug in presolve (see #1908) # Bug fixes * Fix swigwin.exe url * Fix swig typemap management for Java and .Net | Low | 4/23/2020 |
| v7.5 | # Platform updates * Added support for Python 3.8 (#1719) * Dropped support compilation from sources on Visual Studio 2017 (https://github.com/google/or-tools/issues/1852). * Updated support from Centos 7 to Centos 8 (https://github.com/google/or-tools/issues/1827) # Dependency updates * Protobuf 3.10.0 -> 3.11.2 (#1829) # Bug fixes The following and performances improvements (for a complete list see [Milestone v7.5](https://github.com/google/or-tools/milestone/10)) In particular: | Low | 1/28/2020 |
| v7.4 | # Abandoned platforms As announced in the previous release, Python 2.7 has been officially abandoned. # Dependency updates - Protobuf 3.9.0 -> 3.10.0 # New features - **CP-SAT**: The solver now checks for constraints that do not support enforcement literals (they are the Boolean literals passed to OnlyEnforceIf() methods). The model checker will return an error before solving if such a constraint has an enforcement literal. - **Linear Solver**: The linear solver wrapper n | Low | 10/11/2019 |
| v7.3 | # Deprecation of Python 2.7 Important Notice Python 2.7 will be obsolete by the end of 2019. This is likely the last release to support Python 2.7. # Dependencies updates - Protobuf 3.8.0 -> 3.9.0 # Bugfixes and Performance Improvements The usual bunch of fixes and performances improvements (See https://github.com/google/or-tools/projects/6) In particular: - https://github.com/google/or-tools/issues/1448 - https://groups.google.com/forum/?hl=kn#!topic/or-tools-discuss/nplMSi-w8aI | Low | 8/5/2019 |
| v7.2 | # Deprecation of Python 2.7 - **Important Notice** Python 2.7 will be obsolete by the end of 2019. There will be at most one more release supporting python 2.7. # Platform changes - Ubuntu 18.10 -> Ubuntu 19.04 - Support compilation from sources on Visual Studio 2019 - Dropped support for python 3.5 on Windows. # Dependencies updates - CBC 2.10.1 -> 2.10.3 - Protobuf 3.7.1 -> 3.8.0 # CP-SAT - Multiple improvements focusing on the search, the implementation of the parallelism, | Low | 7/4/2019 |
| v7.1 | # Updates to required dependencies * Glog 0.3.5 -> 0.4.0 * Protobuf 3.6.1 -> 3.7.1 * Cbc 2.9.9 -> 2.10.1 * Cgl 0.59.10 -> 0.60.1 * Clp 1.16.11 -> 1.77.1 * Osi 0.107.9 -> 0.108.1 * Coinutils 2.10.14 -> 2.11.1 # CP-SAT * Breaking change in the CP-SAT API in Python, Java and .Net. see doc [here](https://github.com/google/or-tools/blob/master/ortools/sat/doc/integer_arithmetic.md#non-contiguous-domain) * Searching for all solution in a satisfiability problem now returns `OPTIMAL` when | Low | 5/9/2019 |
| v7.0 | # Updates to required dependencies * GFlags 2.2.1 -> 2.2.2 # New required dependencies * Added [abseil-cpp](https://github.com/abseil/abseil-cpp) (set to `SHA1:bf29470`) as required dependency. # Drop Support * Drop support of **Visual C++ 2015** * Visual C++ 2015 is no longer able to compile OR-Tools source code. * Drop support of Python **3.4** on Linux * abseil-cpp headers conflict with `Python.h` header see [abseil-cpp \#235](https://github.com/abseil/abseil-cpp/issues/235) | Low | 3/26/2019 |
| v7.0-beta.1 | # Updates to required dependencies * GFlags 2.2.1 -> 2.2.2 * Added [abseil-cpp](https://github.com/abseil/abseil-cpp) (set SHA1 to 45221cc + CMake patch) as required dependency. # Drop Support * Drop support of VS 2015 * Drop support of Python 3.4 on Linux since abseil-cpp headers conflict with Python.h include see [abseil-cpp \#235](https://github.com/abseil/abseil-cpp/issues/235) # Python * **WARNING** Manylinux `ortools` wheel package have been build against `manylinux2010` (see [P | Low | 12/21/2018 |
| v6.10 | # Dependencies - SCIP 4.0.1 -> 6.0.0 # Makefile We have reworked the build and run targets - To build examples, you must use the `build` target and `SOURCE` variable. This will replace the `ccc`, `cjava` and `cdotnet` targets. e.g. for a C++ example: ```shell make build SOURCE=examples/cpp/example.cc ``` - To run examples, you must use the `run` target and `SOURCE` variable. This will replace the `rcc`, `rjava` and `rdotnet` targets. e.g. for a C++ example: ```shel | Low | 11/28/2018 |
| v6.9.1 | * Fix Release script * Add missing API on CP-SAT Java interface | Low | 9/28/2018 |
| v6.9 | # Updated dependencies * Protobuf 3.5.1 -> 3.6.1 * [Optional] SCIP 4.0 -> 6.0 # CP-SAT * Breaking change API. Full documentation [here](ortools/sat/doc/solver.md). * Expose `ModelStats` and `CpSolverResponseStats` in Python, Java and C#. * Rename `SolveWithSolutionObserver` to `SolveWithSolutionCallback` in Python (#841). * Rename `NewSolution` to `OnSolutionCallback` on solution callback in Python. Make sure to call super in `__init__` e.g.: ```python class MySol | Low | 9/19/2018 |
| v6.8 | # Changelog * CP-SAT various bug fixes, performance improvements, and doc updates * GLOP performance improvements * Use dynamic dependencies on UNIX (#697) * Use Cbc from github mirror (#684) * now depends on `cbc`, `cgl`, `clp`, `osi` and `coinnutils` github repos * Rework and fix some VRP python examples. * Migration to netstandard2.0 for .Net support (#668) * i.e. use of `dotnet` cli instead of `mono`/`msc`/`fsharpc` (not needed anymore) * **/!\\ require .NetCore SDK >= 302 /!\ | Low | 7/25/2018 |
| v6.7.2 | Mostly to fix C++/C#/Java binary archives issue # Changelog * Don't use rm on windows when checking shell * Replace some CHECK_NOTNULL by CHECK * Fixing all remaining StrCat -> absl::StrCat * Fix all remaining StrAppend -> absl::StrAppend * Fix compile error in flexible_jobshop.cc in binary archive (#709) * Fix missing 'ortools/util/optional_boolean.pb.h' files in binary archive (#710) * Fix missnamed mono binary in osx binary archive Makefile (#712) | Low | 6/6/2018 |
| v6.7.1 | Fix Protobuf version on UNIX: ~v3.1.0-alpha-1 (3d9d1a1255) -> v3.5.1 | Low | 3/16/2018 |
| v6.7 | # Update to required dependencies * Protobuf 3.5.0 -> 3.5.1 # Misc * Refactor base to prepare abseil-cpp integration. * Add some CI jobs. * Add `make install_python` target. * Use `JAVA_HOME` instead of `JDK_DIRECTORY` # SAT * Performance improvement. * Improves Python API. * Add C# API aka CpSolver.cs (EXPERIMENTAL). # Glop * Code refactoring. * Performance improvement. # CMake Support (EXPERIMENTAL) * Add C++ OR-Tools CMake support. * Be able to build OR-Tools as a st | Low | 3/9/2018 |
| v6.6 | # Updates to required dependencies * Protobuf to 3.3.0 -> 3.5.0. * gflags to 2.2.0 -> 2.2.1. * CBC 2.9.8 -> 2.9.9. * Add Python module six (1.10) as required dependency for Python. # Bugfixes * Pull request #494 Name refactoring. Adding comments for IntelliSense in some editors. Thanks to <a href="https://github.com/acco32">Matthew Moore</a>. * Pull request #516 Instruction for F# standalone binary. Thanks to <a href="https://github.com/acco32">Matthew Moore</a | Low | 11/30/2017 |
| v6.5 | Release v6.5 | Low | 10/2/2017 |
| v6.4 | # Change in platforms - Pypi modules on Linux platforms are now delivered as wheel files using the manylinux1 tag. Thanks to Federico Ficarelli. With this change, we have backtracked the per-linux modules introduced in the July 2017 release. # New features - Improved scaling method used inside GLOP. - Fix wrapping of evaluators in the C# routing library. Thanks to DevNamedZed. - Improve the performance of the flatzinc presolve for large models. - Use the SAT backed for flat | Low | 9/11/2017 |
| v6.3 | Release v6.3 | Low | 7/31/2017 |
| v6.2 | ## Change in platforms - We now support multiple Linux binary distributions (Ubuntu 14.04, 16.04, 17.04, CentOS 9, Debian 9). - Pypi modules on Linux platforms now include a tag that describes the distribution (ubuntu-14.04, ubuntu-16.04, ubuntu-17.04, centos-7, debian-9). - Python wheel files for Linux are now available to download in the github release page. ## New features We have added support for Docker to build linux artifacts. Go to or-tools/tools/docker and look at the M | Low | 7/14/2017 |
| v6.1 | Release v6.1 | Low | 6/29/2017 |
| v6.0 | # New directory structure in C++ We have changed the source/include structure of or-tools when using C++. The goal is to provide better encapsulation of the C++ include files. It also has the benefit of aligning the C++ and the python directory structures. - src/ has been renamed ortools/. - All #include command in C++ files now have the prefix ortools added. #include "constraint/constraint_solver.h" is now #include "ortools/constraint/constraint_solver.h". # New features ## Bazel s | Low | 5/16/2017 |
| v5.1 | ### New Features Installing - Introduced simpler procedures for installing or-tools, either from binary distributions or from source code. See [Installing or-tools](https://developers.google.com/optimization/introduction/installing.html) for more information. Routing - Implemented an algorithm to compute the Held-Karp lower bound for symmetric Traveling Salesman Problems. This enables you to compute an upper bound to the gap between the cost of a potentially non-optimal solution and the co | Low | 1/27/2017 |
| v5.0 | ### November 2016 Running examples - Introduced language specific targets to compile and run the examples. Please check this [page](/optimization/run_programs) for more details. Sat - Added support for constraint programming. - Implemented the [diffn](http://web.emn.fr/x-info/sdemasse/gccat/Cdiffn.html), [cumulative](http://web.emn.fr/x-info/sdemasse/gccat/Ccumulative.html) , [circuit and subcircuit](http://web.emn.fr/x-info/sdemasse/gccat/Ccircuit.html) constraints. - Implemented [the | Low | 11/7/2016 |
| v4.4 | - Sat - Extended scheduling API and modified examples (weighted_tardiness_sat, and jobshop_sat) to use it. - Graph - Added iterator traits to Graph classes. - Or-tools distribution - Nuget package is supported again. | Low | 9/19/2016 |
| v4.3 | ### Constraint solver - solver - Implemented NotBetween method to constrain a variable to be outside a given interval. - routing - Added a parse of the model to check existing NotMember constraints as shown in this [example](https://github.com/google/or-tools/blob/master/examples/cpp/cvrp_disjoint_tw.cc#L125"), and use them in local search filters. - Added local search profiling. - Fix for local moves. ### Linear solver - Fixed SCIP status reporting. ### Sat - Implemented [Solve | Low | 8/23/2016 |
| v4.2 | We’re happy to announce the release of July 2016 version of or-tools. Here's what's new with this release: Constraint solver: - Routing - A disjunction can now be defined with a cardinality, which is the maximum number of nodes that can be active within this disjunction. For example, if you add a disjunction with n nodes and a cardinality of k, then k nodes among the n nodes are allowed to be active. You can use the new definition of [AddDisjunction](https://github.com/google/or-tools/blob/m | Low | 7/27/2016 |
| v2016-06 | Examples: - c++: getting rid of filelinereader in examples - data: Add single machine scheduling problems Sat: - Remove unused core method (Resolution nodes) - Added drat writer to checks proofs on unsatisfiability - Add preprocessor Documentation: - Lots of cleanup in the header files. - Please check the new documentation at https://developers.google.com/optimization/ Bop: - Add new neighborhoods Constraint Solver: - Removed most of the instances of the callbacks (src/base/callback.h) | Low | 6/17/2016 |
| v2016-04 | Main changes: - Use protobuf instead of flags in the Constraint Programming and routing libraries. - See http://or-tools.blogspot.fr/2016/02/heads-up-upcoming-incompatibility-in.html for details. | Low | 4/13/2016 |
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