Compilare: main.cpp: In function 'void dfs(int)': main.cpp:14:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 14 | for(int i =0;i<gr[node].size();++i) | ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:35:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | for(int i=0;i<s.size();++i) | ~^~~~~~~~~