In file included from /in/Compile/check.cpp:7:
/in/sokoban.hpp:63:17: error: implicit conversion changes signedness: 'int' to 'std::vector::size_type' (aka 'unsigned long') [-Werror,-Wsign-conversion]
    return grid[y][x] == '.' || grid[y][x] == 'T';
           ~~~~ ^
/in/sokoban.hpp:63:20: error: implicit conversion changes signedness: 'int' to 'std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::size_type' (aka 'unsigned long') [-Werror,-Wsign-conversion]
    return grid[y][x] == '.' || grid[y][x] == 'T';
           ~~~~    ^
/in/sokoban.hpp:63:38: error: implicit conversion changes signedness: 'int' to 'std::vector::size_type' (aka 'unsigned long') [-Werror,-Wsign-conversion]
    return grid[y][x] == '.' || grid[y][x] == 'T';
                                ~~~~ ^
/in/sokoban.hpp:63:41: error: implicit conversion changes signedness: 'int' to 'std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::size_type' (aka 'unsigned long') [-Werror,-Wsign-conversion]
    return grid[y][x] == '.' || grid[y][x] == 'T';
                                ~~~~    ^
/in/sokoban.hpp:93:22: error: implicit conversion changes signedness: 'int' to 'std::vector::size_type' (aka 'unsigned long') [-Werror,-Wsign-conversion]
            if (grid[y][x] == 'S') {
                ~~~~ ^
/in/sokoban.hpp:93:25: error: implicit conversion changes signedness: 'int' to 'std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::size_type' (aka 'unsigned long') [-Werror,-Wsign-conversion]
            if (grid[y][x] == 'S') {
                ~~~~    ^
/in/sokoban.hpp:96:22: error: implicit conversion changes signedness: 'int' to 'std::vector::size_type' (aka 'unsigned long') [-Werror,-Wsign-conversion]
                grid[y][x] = '.'; // Convert start point to walkable path
                ~~~~ ^
/in/sokoban.hpp:96:25: error: implicit conversion changes signedness: 'int' to 'std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::size_type' (aka 'unsigned long') [-Werror,-Wsign-conversion]
                grid[y][x] = '.'; // Convert start point to walkable path
                ~~~~    ^
/in/sokoban.hpp:97:29: error: implicit conversion changes signedness: 'int' to 'std::vector::size_type' (aka 'unsigned long') [-Werror,-Wsign-conversion]
            } else if (grid[y][x] == 'B') {
                       ~~~~ ^
/in/sokoban.hpp:97:32: error: implicit conversion changes signedness: 'int' to 'std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::size_type' (aka 'unsigned long') [-Werror,-Wsign-conversion]
            } else if (grid[y][x] == 'B') {
                       ~~~~    ^
/in/sokoban.hpp:99:22: error: implicit conversion changes signedness: 'int' to 'std::vector::size_type' (aka 'unsigned long') [-Werror,-Wsign-conversion]
                grid[y][x] = '.'; // Convert box to walkable path
                ~~~~ ^
/in/sokoban.hpp:99:25: error: implicit conversion changes signedness: 'int' to 'std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::size_type' (aka 'unsigned long') [-Werror,-Wsign-conversion]
                grid[y][x] = '.'; // Convert box to walkable path
                ~~~~    ^
/in/sokoban.hpp:100:29: error: implicit conversion changes signedness: 'int' to 'std::vector::size_type' (aka 'unsigned long') [-Werror,-Wsign-conversion]
            } else if (grid[y][x] == 'T') {
                       ~~~~ ^
/in/sokoban.hpp:100:32: error: implicit conversion changes signedness: 'int' to 'std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::size_type' (aka 'unsigned long') [-Werror,-Wsign-conversion]
            } else if (grid[y][x] == 'T') {
                       ~~~~    ^
/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/Compile/check.cpp:72:22: error: use of undeclared identifier 'print_answer'
        submit_ans = print_answer(index);
                     ^
17 errors generated.
/in/Compile/Makefile:16: recipe for target 'main' failed
make: *** [main] Error 1