In file included from /in/Compile/check.cpp:7:
/in/sokoban.hpp:77:22: error: implicit conversion changes signedness: 'int' to 'size_t' (aka 'unsigned long') [-Werror,-Wsign-conversion]
    size_t start_x = -1, start_y = -1;
           ~~~~~~~   ^~
/in/sokoban.hpp:77:36: error: implicit conversion changes signedness: 'int' to 'size_t' (aka 'unsigned long') [-Werror,-Wsign-conversion]
    size_t start_x = -1, start_y = -1;
                         ~~~~~~~   ^~
/in/sokoban.hpp:116:83: error: implicit conversion changes signedness: 'int' to 'unsigned long' [-Werror,-Wsign-conversion]
            size_t new_player_x = current_state.player_x + direction_vectors[dir].first;
                                                         ~ ~~~~~~~~~~~~~~~~~~~~~~~^~~~~
/in/sokoban.hpp:117:83: error: implicit conversion changes signedness: 'int' to 'unsigned long' [-Werror,-Wsign-conversion]
            size_t new_player_y = current_state.player_y + direction_vectors[dir].second;
                                                         ~ ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
/in/sokoban.hpp:128:90: error: implicit conversion changes signedness: 'int' to 'size_t' (aka 'unsigned long') [-Werror,-Wsign-conversion]
                    if (can_push_box(grid, box.first, box.second, direction_vectors[dir].first, direction_vectors[dir].second)) {
                        ~~~~~~~~~~~~                              ~~~~~~~~~~~~~~~~~~~~~~~^~~~~
/in/sokoban.hpp:128:120: error: implicit conversion changes signedness: 'int' to 'size_t' (aka 'unsigned long') [-Werror,-Wsign-conversion]
                    if (can_push_box(grid, box.first, box.second, direction_vectors[dir].first, direction_vectors[dir].second)) {
                        ~~~~~~~~~~~~                                                            ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
/in/sokoban.hpp:129:61: error: implicit conversion changes signedness: 'int' to 'unsigned long' [-Werror,-Wsign-conversion]
                        box.first += direction_vectors[dir].first;
                                  ~~ ~~~~~~~~~~~~~~~~~~~~~~~^~~~~
/in/sokoban.hpp:130:62: error: implicit conversion changes signedness: 'int' to 'unsigned long' [-Werror,-Wsign-conversion]
                        box.second += direction_vectors[dir].second;
                                   ~~ ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
8 errors generated.
/in/Compile/Makefile:16: recipe for target 'main' failed
make: *** [main] Error 1