Compilare: main.cpp: In function 'int main()': main.cpp:161:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 161 | for(int i = 0; i < v1.size(); i++){ | ~~^~~~~~~~~~~ main.cpp:162:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 162 | for(int j = 0; j < v2.size(); j++){ | ~~^~~~~~~~~~~ main.cpp:151:9: warning: unused variable 'x1' [-Wunused-variable] 151 | int x1, y1, x2, y2; | ^~ main.cpp:151:13: warning: unused variable 'y1' [-Wunused-variable] 151 | int x1, y1, x2, y2; | ^~ main.cpp:151:17: warning: unused variable 'x2' [-Wunused-variable] 151 | int x1, y1, x2, y2; | ^~ main.cpp:151:21: warning: unused variable 'y2' [-Wunused-variable] 151 | int x1, y1, x2, y2; | ^~