In file included from /in/Compile/check.cpp:7:
/in/sokoban.hpp:33:17: error: implicit conversion loses integer precision: 'std::size_t' (aka 'unsigned long') to 'int' [-Werror,-Wshorten-64-to-32]
        int h = std::hash<int>()(state.player_x);
            ~   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/sokoban.hpp:134:85: error: implicit conversion changes signedness: 'int' to 'size_t' (aka 'unsigned long') [-Werror,-Wsign-conversion]
            if (!is_within_bounds(new_px, new_py, rows, cols) || !is_walkable(grid, new_px, new_py)) {
                                                                  ~~~~~~~~~~~       ^~~~~~
/in/sokoban.hpp:146:89: error: implicit conversion changes signedness: 'int' to 'size_t' (aka 'unsigned long') [-Werror,-Wsign-conversion]
                if (!is_within_bounds(new_bx, new_by, rows, cols) || !is_walkable(grid, new_bx, new_by)) {
                                                                      ~~~~~~~~~~~       ^~~~~~
/in/sokoban.hpp:84:21: error: implicit conversion loses integer precision: 'std::vector::size_type' (aka 'unsigned long') to 'int' [-Werror,-Wshorten-64-to-32]
    int rows = grid.size();
        ~~~~   ~~~~~^~~~~~
/in/sokoban.hpp:85:24: error: implicit conversion loses integer precision: 'std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::size_type' (aka 'unsigned long') to 'int' [-Werror,-Wshorten-64-to-32]
    int cols = grid[0].size();
        ~~~~   ~~~~~~~~^~~~~~
/in/sokoban.hpp:190:20: error: implicit conversion changes signedness: 'int' to 'std::vector::size_type' (aka 'unsigned long') [-Werror,-Wsign-conversion]
    return answers[(int)index];
           ~~~~~~~ ^~~~~~~~~~
6 errors generated.
/in/Compile/Makefile:16: recipe for target 'main' failed
make: *** [main] Error 1