Compilare: main.cpp: In function 'int main()': main.cpp:38:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for(int j = 0; j < veci[i].size(); ++j) | ~~^~~~~~~~~~~~~~~~