In file included from /in/Compile/check.cpp:7:
/in/sokoban.hpp:59:43: error: implicit conversion changes signedness: 'int' to 'unsigned long' [-Werror,-Wsign-conversion]
        hash = (hash * prime + (pos.first + pos.second)) % prime;
                             ~  ~~~~~~~~~~^~~~~~~~~~~~
/in/sokoban.hpp:70:54: error: implicit conversion changes signedness: 'int' to 'unsigned long' [-Werror,-Wsign-conversion]
        std::size_t playerHash = (state.player.first + state.player.second) % prime;
                                  ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~  ~
2 errors generated.
/in/Compile/Makefile:16: recipe for target 'main' failed
make: *** [main] Error 1