Compilare: main.cpp: In function 'int main()': main.cpp:69:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 69 | for (int i = 0; i < ans.size(); i++) { | ~~^~~~~~~~~~~~ main.cpp:105:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 105 | for (int i = 0; i < ans.size(); i++) { | ~~^~~~~~~~~~~~ main.cpp:74:7: warning: unused variable 'ap1' [-Wunused-variable] 74 | int ap1=0, ap2=0; | ^~~