Compilare: main.cpp: In function 'std::pair<int, int> find_min()': main.cpp:28:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | if (idx[j] < who[j].size()) | ~~~~~~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:81:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 81 | for (i = 0; i <= who[3].size(); i++) | ~~^~~~~~~~~~~~~~~~ main.cpp:109:42: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 109 | while (idx[1] < fromA and idx[1] < who[1].size()) | ~~~~~~~^~~~~~~~~~~~~~~ main.cpp:115:42: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 115 | while (idx[2] < fromB and idx[2] < who[2].size()) | ~~~~~~~^~~~~~~~~~~~~~~