Compilare: main.cpp: In function 'int main()': main.cpp:42:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | for (i = 0; i <= who[3].size(); i++) | ~~^~~~~~~~~~~~~~~~ main.cpp:49:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 49 | if (fromB <= who[2].size() and fromA <= who[1].size()) | ~~~~~~^~~~~~~~~~~~~~~~ main.cpp:49:46: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 49 | if (fromB <= who[2].size() and fromA <= who[1].size()) | ~~~~~~^~~~~~~~~~~~~~~~ main.cpp:69:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 69 | if (idx[j] < who[j].size()) | ~~~~~~~^~~~~~~~~~~~~~~