Compilare: main.cpp: In function 'int main()': main.cpp:34:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | for(int i = 0; i<v[1].vec.size(); i++) | ~^~~~~~~~~~~~~~~~ main.cpp:60:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 60 | for(int i = 0; i<v[pmax].vec.size(); i++) | ~^~~~~~~~~~~~~~~~~~~