Compilare: main.cpp: In function 'int main()': main.cpp:42:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | for(int i=0;i<e.size();i++) | ~^~~~~~~~~ main.cpp:44:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | for(int j=i+1;j<e.size();j++) | ~^~~~~~~~~ main.cpp:46:28: 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 k=j+1;k<e.size();k++) | ~^~~~~~~~~