Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:25:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for (i = 0; i<v[r].size(); i++) | ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:65:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 65 | for (it = 0; it<intv[i].size(); it++) | ~~^~~~~~~~~~~~~~~