foo.cc: In function ‘int main()’:
foo.cc:21:30: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<int>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   21 |                 for(int i=0;i<k[x].size();i++)q[k[x][i]]--;
      |                             ~^~~~~~~~~~~~

正在同步测试数据，请稍后