Compilare: main.cpp: In function 'void dfs3(ll, ll)': main.cpp:106:29: warning: comparison of integer expressions of different signedness: 'std::set<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare] 106 | while (bestK.size() < k) { | ~~~~~~~~~~~~~^~~ main.cpp:120:29: warning: comparison of integer expressions of different signedness: 'std::set<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare] 120 | while (bestK.size() < k) { | ~~~~~~~~~~~~~^~~