Compilare: main.cpp: In function 'void dfs(int, int, int)': main.cpp:88:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 88 | while (i < vec.size()) | ~~^~~~~~~~~~~~ main.cpp:90:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 90 | for (j = i; j < vec.size() and vec[j].first == vec[i].first; j++) | ~~^~~~~~~~~~~~