Compilare: main.cpp: In function 'void dfs(int)': main.cpp:19:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | for (int i = 0; i < v[k].size(); i++) | ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:54:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 54 | for (x = 0; x < v[y].size(); x++) | ~~^~~~~~~~~~~~~