Compilare: main.cpp: In function 'int main()': main.cpp:43:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | for (int i = 0; i < v.size(); i++) g<<v[i].first<<':'<<v[i].second<<' '; | ~~^~~~~~~~~~ main.cpp:46:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | for (int i = 0; i < v.size()-1; i++) { | ~~^~~~~~~~~~~~ main.cpp:55:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | for (int i = 0; i < v.size(); i++) g<<v[i].first<<':'<<v[i].second<<' '; | ~~^~~~~~~~~~