foo.cc: In function 'int main()':
foo.cc:92:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   92 |  scanf("%d%d%lf", &n, &m, &k);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~
foo.cc:94:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   94 |   scanf("%d%d%lf", &u, &v, &w);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

正在同步测试数据，请稍后
[Hydro](https://hydro.ac)提供评测服务