Compilare: main.cpp: In function 'int main()': main.cpp:29:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | for(int j=0; j<l[i].size(); j++){ | ~^~~~~~~~~~~~ main.cpp:41:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | for(int j=0; j<l[i].size(); j++){ | ~^~~~~~~~~~~~