foo.cc: In function ‘void klskr()’:
foo.cc:29:13: error: ‘res’ was not declared in this scope
   29 |             res += edg[i].w;//a b 之间这条边要
      |             ^~~
foo.cc: In function ‘int main()’:
foo.cc:52:25: error: ‘res’ was not declared in this scope
   52 |                 cout << res << endl;
      |                         ^~~

正在同步测试数据，请稍后