Compilare: main.cpp: In function 'int main()': main.cpp:55:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | if (idx[j] + 1 < who[j].size()) | ~~~~~~~~~~~^~~~~~~~~~~~~~~ main.cpp:72:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 72 | for (i = 0; i <= who[3].size(); i++) | ~~^~~~~~~~~~~~~~~~ main.cpp:101:50: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 101 | while (idx[1] + 1 < fromA and idx[1] + 1 < who[1].size()) | ~~~~~~~~~~~^~~~~~~~~~~~~~~ main.cpp:107:50: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 107 | while (idx[2] + 1 < fromB and idx[2] + 1 < who[2].size()) | ~~~~~~~~~~~^~~~~~~~~~~~~~~