Compilare: main.cpp: In function 'int main()': main.cpp:44:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | for(int i=0; i<vals.size(); i++) | ~^~~~~~~~~~~~ main.cpp:53:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | for(int j=0; j<add[i].size(); j++) | ~^~~~~~~~~~~~~~