Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:24:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i<T[x].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:41:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<T[X].size(); ++i) ^