Compilare: main.cpp: In function 'std::pair<int, int> find_min()': main.cpp:30:20: 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] < who[j].size()) | ~~~~~~~^~~~~~~~~~~~~~~ main.cpp: In function 'void baga(int, int)': main.cpp:45:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 45 | while (idx[category] < who[category].size() and idx[category] < need) | ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'bool optimize(int, int)': main.cpp:67:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 67 | if (idx[i] < who[i].size() and mn > who[i][idx[i]]) | ~~~~~~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:129:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 129 | for (i = 0; i <= who[3].size(); i++) | ~~^~~~~~~~~~~~~~~~