Compilare: user.cpp: In function ‘void st(int)’: user.cpp:14:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[x].size();i++) ^ user.cpp: In function ‘void dfs(int)’: user.cpp:24:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Gt[x].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:53:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<C[i].size();j++) ^ user.cpp:31:17: warning: unused variable ‘ok’ [-Wunused-variable] int n,m,x,y,ok,i; ^