Compilare: main.cpp: In function 'int main()': main.cpp:52:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<char, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 52 | for(int i=0;i<x.size();i++) | ~^~~~~~~~~ main.cpp:59:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<char, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 59 | for(int i=0;i<y.size();i++) | ~^~~~~~~~~