Compilare: main.cpp: In function 'int main()': main.cpp:54:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 54 | for( j = 0; j < ans[0].size(); j++ ) | ~~^~~~~~~~~~~~~~~