In file included from /in/Compile/check.cpp:7:
/in/sokoban.hpp:177:56: error: implicit conversion changes signedness: 'int' to 'unsigned long' [-Werror,-Wsign-conversion]
    int newPlayerRow = (int)(state.player.to_ulong() / numCols) + move.first;
                                                     ~ ^~~~~~~
/in/sokoban.hpp:253:20: error: implicit conversion changes signedness: 'int' to 'unsigned long long' [-Werror,-Wsign-conversion]
    state.player = newPlayerPos;
                   ^~~~~~~~~~~~
/in/sokoban.hpp:275:52: error: implicit conversion changes signedness: 'int' to 'unsigned long long' [-Werror,-Wsign-conversion]
                initialState.player = (i * numCols + j);
                                      ~~~~~~~~~~~~~^~~
3 errors generated.
/in/Compile/Makefile:16: recipe for target 'main' failed
make: *** [main] Error 1