Compilare: main.cpp: In function 'int main()': main.cpp:79:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 79 | for (int i = 0; i < L[y].size(); i++) | ~~^~~~~~~~~~~~~ main.cpp:88:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 88 | for (int i = 0; i < L[x].size(); i++) | ~~^~~~~~~~~~~~~