Compilare: main.cpp: In function 'void rec(std::pair<int, int>, int)': main.cpp:41:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | for(int i=0; i<ac.size(); i++){ | ~^~~~~~~~~~ main.cpp: In function 'int32_t main()': main.cpp:157:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 157 | while(i<=ans.size()){ | ~^~~~~~~~~~~~ main.cpp:161:9: 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 | if(i>ans.size()){ | ~^~~~~~~~~~~