/in/foo.cc: In function 'void tarjan(int)':
/in/foo.cc:16:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<G[u].size();i++)
                 ~^~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:55:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int j=0;j<G[i].size();j++)
                     ~^~~~~~~~~~~~
/in/foo.cc:68:23: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
             if (ans=-1) ans=i;
                       ^

VJ4Error('ProblemDataNotFoundError', '题目 590c9c2bd3d8a13210993b33 的数据未找到。', 'newbzoj', '590c9c2bd3d8a13210993b33')