Compilare: user.cpp: In function ‘void query(int)’: user.cpp:15:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<qind[nod].size();i++) ^ user.cpp: In function ‘void dfs(int)’: user.cpp:25:31: 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:34:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,x,n,m,q; ^