Compilare: main.cpp: In function 'bool find_pair(int)': main.cpp:15:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | for(int i = 0; i < edge[node].size(); i++){ | ~~^~~~~~~~~~~~~~~~~~~ main.cpp:23:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | for(int i = 0; i < edge[node].size(); i++){ | ~~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:59:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 59 | for(int i = 0 ; i < ans.size(); i++) | ~~^~~~~~~~~~~~