Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:19:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[nod].size(); ++i){ ^ user.cpp: In function ‘int main()’: user.cpp:54:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ans.size(); ++i){ ^ user.cpp:64:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ans2.size(); ++i){ ^