Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:30:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<G[x].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:72:40: warning: left operand of comma operator has no effect [-Wunused-value] for (int j=seq[i],k=seq[i+1]; j<seq[i+1],k<seq[i+2];) ^