Compilare: main.cpp: In function 'int main()': main.cpp:58:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | for(int i=0; i<l.size(); i++) | ~^~~~~~~~~ main.cpp:70:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 70 | for(int i=0; i<sol.size(); i++) | ~^~~~~~~~~~~