/in/project1.cpp:28:29: warning: implicit conversion changes signedness: 'int' to 'std::vector::size_type' (aka 'unsigned long') [-Wsign-conversion]
    map        original_map(height, vector<char>(width, 0));
               ~~~~~~~~~~~~ ^~~~~~
/in/project1.cpp:28:50: warning: implicit conversion changes signedness: 'int' to 'std::vector::size_type' (aka 'unsigned long') [-Wsign-conversion]
    map        original_map(height, vector<char>(width, 0));
                                    ~~~~~~       ^~~~~
/in/project1.cpp:29:42: warning: implicit conversion changes signedness: 'int' to 'std::vector::size_type' (aka 'unsigned long') [-Wsign-conversion]
    discovered discovered_map(num_colors + 1, vector<vector<char>>(height, vector<char>(width, 0)));
               ~~~~~~~~~~~~~~ ~~~~~~~~~~~^~~
/in/project1.cpp:29:68: warning: implicit conversion changes signedness: 'int' to 'std::vector::size_type' (aka 'unsigned long') [-Wsign-conversion]
    discovered discovered_map(num_colors + 1, vector<vector<char>>(height, vector<char>(width, 0)));
                                              ~~~~~~               ^~~~~~
/in/project1.cpp:29:89: warning: implicit conversion changes signedness: 'int' to 'std::vector::size_type' (aka 'unsigned long') [-Wsign-conversion]
    discovered discovered_map(num_colors + 1, vector<vector<char>>(height, vector<char>(width, 0)));
                                                                           ~~~~~~       ^~~~~
/in/project1.cpp:30:39: warning: implicit conversion changes signedness: 'int' to 'std::vector::size_type' (aka 'unsigned long') [-Wsign-conversion]
    backtrack  backtracker(num_colors + 1, vector<vector<char>>(height, vector<char>(width, -1)));
               ~~~~~~~~~~~ ~~~~~~~~~~~^~~
/in/project1.cpp:30:65: warning: implicit conversion changes signedness: 'int' to 'std::vector::size_type' (aka 'unsigned long') [-Wsign-conversion]
    backtrack  backtracker(num_colors + 1, vector<vector<char>>(height, vector<char>(width, -1)));
                                           ~~~~~~               ^~~~~~
/in/project1.cpp:30:86: warning: implicit conversion changes signedness: 'int' to 'std::vector::size_type' (aka 'unsigned long') [-Wsign-conversion]
    backtrack  backtracker(num_colors + 1, vector<vector<char>>(height, vector<char>(width, -1)));
                                                                        ~~~~~~       ^~~~~
/in/project1.cpp:32:39: warning: implicit conversion changes signedness: 'int' to 'unsigned int' [-Wsign-conversion]
    state            start = read_map(num_colors, width, height, original_map);
                             ~~~~~~~~ ^~~~~~~~~~
/in/project1.cpp:32:51: warning: implicit conversion changes signedness: 'int' to 'unsigned int' [-Wsign-conversion]
    state            start = read_map(num_colors, width, height, original_map);
                             ~~~~~~~~             ^~~~~
/in/project1.cpp:32:58: warning: implicit conversion changes signedness: 'int' to 'unsigned int' [-Wsign-conversion]
    state            start = read_map(num_colors, width, height, original_map);
                             ~~~~~~~~                    ^~~~~~
/in/project1.cpp:33:32: warning: implicit conversion changes signedness: 'int' to 'unsigned int' [-Wsign-conversion]
    state end = discover_route(width, height, start, original_map, discovered_map, backtracker,
                ~~~~~~~~~~~~~~ ^~~~~
/in/project1.cpp:33:39: warning: implicit conversion changes signedness: 'int' to 'unsigned int' [-Wsign-conversion]
    state end = discover_route(width, height, start, original_map, discovered_map, backtracker,
                ~~~~~~~~~~~~~~        ^~~~~~
/in/project1.cpp:36:66: warning: implicit conversion changes signedness: 'int' to 'unsigned int' [-Wsign-conversion]
    output(end, backtracker, original_map, opts, discovered_map, width, height, num_colors);
    ~~~~~~                                                       ^~~~~
/in/project1.cpp:36:73: warning: implicit conversion changes signedness: 'int' to 'unsigned int' [-Wsign-conversion]
    output(end, backtracker, original_map, opts, discovered_map, width, height, num_colors);
    ~~~~~~                                                              ^~~~~~
/in/project1.cpp:36:81: warning: implicit conversion changes signedness: 'int' to 'unsigned int' [-Wsign-conversion]
    output(end, backtracker, original_map, opts, discovered_map, width, height, num_colors);
    ~~~~~~                                                                      ^~~~~~~~~~
16 warnings generated.
/in/map.cpp:42:31: warning: implicit conversion changes signedness: '__gnu_cxx::__alloc_traits<std::allocator<char> >::value_type' (aka 'char') to 'unsigned char' [-Wsign-conversion]
            unsigned char t = tmp[i];
                          ~   ^~~~~~
/in/map.cpp:67:25: warning: implicit conversion changes signedness: 'unsigned char' to '__gnu_cxx::__alloc_traits<std::allocator<char> >::value_type' (aka 'char') [-Wsign-conversion]
            map[j][i] = t;
                      ~ ^
/in/map.cpp:126:23: warning: implicit conversion changes signedness: 'char' to 'std::vector::size_type' (aka 'unsigned long') [-Wsign-conversion]
           discovered[color][y][x] || (is_button(c) && discovered[button_to_id(c)][y][x]);
           ~~~~~~~~~~ ^~~~~
/in/map.cpp:126:67: warning: implicit conversion changes signedness: 'char' to 'std::vector::size_type' (aka 'unsigned long') [-Wsign-conversion]
           discovered[color][y][x] || (is_button(c) && discovered[button_to_id(c)][y][x]);
                                                       ~~~~~~~~~~ ^~~~~~~~~~~~~~~
/in/map.cpp:157:16: warning: implicit conversion changes signedness: 'char' to 'std::vector::size_type' (aka 'unsigned long') [-Wsign-conversion]
    discovered[c][y][x] = 1;
    ~~~~~~~~~~ ^
/in/map.cpp:164:21: warning: implicit conversion changes signedness: 'char' to 'std::vector::size_type' (aka 'unsigned long') [-Wsign-conversion]
    if (backtracker[c][y][x] != -1) {
        ~~~~~~~~~~~ ^
/in/map.cpp:167:17: warning: implicit conversion changes signedness: 'char' to 'std::vector::size_type' (aka 'unsigned long') [-Wsign-conversion]
    backtracker[c][y][x] = action;
    ~~~~~~~~~~~ ^
/in/map.cpp:182:22: warning: implicit conversion changes signedness: 'const char' to 'std::vector::size_type' (aka 'unsigned long') [-Wsign-conversion]
    discovered[start.color][start.y][start.x] = 1;
    ~~~~~~~~~~ ~~~~~~^~~~~
/in/map.cpp:261:43: warning: implicit conversion changes signedness: 'char' to 'std::vector::size_type' (aka 'unsigned long') [-Wsign-conversion]
        char action = backtracker[current.color][current.y][current.x];
                      ~~~~~~~~~~~ ~~~~~~~~^~~~~
/in/map.cpp:298:43: warning: implicit conversion changes signedness: 'char' to 'std::vector::size_type' (aka 'unsigned long') [-Wsign-conversion]
        char action = backtracker[current.color][current.y][current.x];
                      ~~~~~~~~~~~ ~~~~~~~~^~~~~
/in/map.cpp:313:32: warning: implicit conversion changes signedness: 'char' to 'std::vector::size_type' (aka 'unsigned long') [-Wsign-conversion]
            discovered[current.color][current.y][current.x] = '@';
            ~~~~~~~~~~ ~~~~~~~~^~~~~
/in/map.cpp:314:24: warning: implicit conversion changes signedness: 'char' to 'std::vector::size_type' (aka 'unsigned long') [-Wsign-conversion]
            discovered[action][current.y][current.x]        = '%';
            ~~~~~~~~~~ ^~~~~~
/in/map.cpp:362:33: warning: implicit conversion changes signedness: 'char' to 'std::vector::size_type' (aka 'unsigned long') [-Wsign-conversion]
            char c = discovered[layer][s.y][s.x];
                     ~~~~~~~~~~ ^~~~~
13 warnings generated.