Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:41:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | for (i = 0; i<v[r].size(); i++) | ~^~~~~~~~~~~~ main.cpp:55:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | for (i = 0; i<v[r].size(); i++) | ~^~~~~~~~~~~~