In file included from /in/Compile/check.cpp:7:
/in/sokoban.hpp:114:71: error: implicit conversion changes signedness: 'int' to 'unsigned long' [-Werror,-Wsign-conversion]
            Position nextPlayer = {current.player.row + directions[i].first,
                                                      ~ ~~~~~~~~~~~~~~^~~~~
/in/sokoban.hpp:115:71: error: implicit conversion changes signedness: 'int' to 'unsigned long' [-Werror,-Wsign-conversion]
                                   current.player.col + directions[i].second};
                                                      ~ ~~~~~~~~~~~~~~^~~~~~
/in/sokoban.hpp:124:70: error: implicit conversion changes signedness: 'int' to 'unsigned long' [-Werror,-Wsign-conversion]
                Position behindBox = {nextPlayer.row + directions[i].first,
                                                     ~ ~~~~~~~~~~~~~~^~~~~
/in/sokoban.hpp:125:70: error: implicit conversion changes signedness: 'int' to 'unsigned long' [-Werror,-Wsign-conversion]
                                      nextPlayer.col + directions[i].second};
                                                     ~ ~~~~~~~~~~~~~~^~~~~~
4 errors generated.
/in/Compile/Makefile:16: recipe for target 'main' failed
make: *** [main] Error 1