Compilare: main.cpp: In function 'std::pair<int, int> find_min()': main.cpp:30:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | if (idx[j] + 1 < who[j].size()) | ~~~~~~~~~~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:83:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 83 | for (i = 0; i <= who[3].size(); i++) | ~~^~~~~~~~~~~~~~~~ main.cpp:111:50: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 111 | while (idx[1] + 1 < fromA and idx[1] + 1 < who[1].size()) | ~~~~~~~~~~~^~~~~~~~~~~~~~~ main.cpp:117:50: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 117 | while (idx[2] + 1 < fromB and idx[2] + 1 < who[2].size()) | ~~~~~~~~~~~^~~~~~~~~~~~~~~