Compilare: main.cpp: In function 'int main()': main.cpp:55:19: 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++){ | ~^~~~~~~~~ main.cpp:41:9: warning: unused variable 'x1' [-Wunused-variable] 41 | int x1,y1; | ^~ main.cpp:41:12: warning: unused variable 'y1' [-Wunused-variable] 41 | int x1,y1; | ^~