This is a modest proof of concept where I intended to play with advanced human
heuristics, and also with C++20, C++23 stdex::mdspan and stdex::mdarray,
Modern CMake, Doctest BDD macros... Hence this overdesigned solution.
In the end, brute force solving is extremely fast: we don't really need heuristics like hidden singles, naked pairs/triples, pointing...
Yet the internals has been designed with these evolutions in mind. Hence the
internal (optimized) bitset to model candidates in cells.
Many things remain to be done like
- cleaning dead code
- documenting some classes and design choices
- simplify the cells
- implement these human solving heuristics (see http://www.sudokusnake.com/techniques.php, http://angusj.com/sudoku/hints.php, etc)
The input format should be compatible with the puzzles available on Simple Sudoku website.
To compile the code you'll need
- a C++20 compiler like clang++ 13 for instance
- CMake 3.19
Then, the compilation can be done with:
# Configure in ../build/build-static-13
CXX=clang++ cmake -G Ninja -S . -B ../build/build-static-13 -DBUILD_SHARED_LIBS=NO -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_FLAGS='-stdlib=libc++ -Wall -Wextra' -DCMAKE_EXE_LINKER_FLAGS='-stdlib=libc++' -DCMAKE_EXPORT_COMPILE_COMMANDS=On
# Compile
cmake --build ../build/build-static-13Tests can be ran with
cd ../build/build-static-13 && ctest
# Or
../build/build-static-13/tests/testsCopyright 2021, Luc Hermitte
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