foo.cc: In function 'int main()':
foo.cc:33:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld%lld",&n,&m);
  ~~~~~^~~~~~~~~~~~~~~~~~
foo.cc:37:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld%lld",&tree[i][1],&num);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:39:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%lld",&v),add(i,v);
    ~~~~~~~~~~~~~~~~^~~~~~~~~

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