Compilare: main.cpp: In function 'int main()': main.cpp:52:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::__cxx11::basic_string<char>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 52 | for(int i = 0;i < v.size();++i) | ~~^~~~~~~~~~ main.cpp:55:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::__cxx11::basic_string<char>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | for(int j = 0;j < sol.size();++j) | ~~^~~~~~~~~~~~ main.cpp:74:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::__cxx11::basic_string<char>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 74 | for(int i = 0;i < sol.size();++i) | ~~^~~~~~~~~~~~