Compilare: main.cpp: In function 'int back(int)': main.cpp:57:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | for(int i=0;i<v.size();i++) | ~^~~~~~~~~ main.cpp:85:1: warning: no return statement in function returning non-void [-Wreturn-type] 85 | } | ^ main.cpp: In function 'int rez()': main.cpp:42:1: warning: control reaches end of non-void function [-Wreturn-type] 42 | } | ^