Compilare: main.cpp: In function 'int main()': main.cpp:114:25: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 114 | if (s.size()==n-1) { | ~~~~~~~~^~~~~ main.cpp:121:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 121 | for (int i = 0; i < s.size(); ++i) { | ~~^~~~~~~~~~