In file included from /in/Compile/check.cpp:7:
/in/sokoban.hpp:38:47: error: implicit conversion loses integer precision: 'unsigned long' to 'int' [-Werror,-Wshorten-64-to-32]
    int hash = std::hash<int>()(player.first) ^ std::hash<int>()(player.second);
        ~~~~   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
/in/Compile/Makefile:16: recipe for target 'main' failed
make: *** [main] Error 1