foo.cc: In function 'int main()':
foo.cc:24:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   24 |  scanf("%d",&n);
      |  ~~~~~^~~~~~~~~
foo.cc:25:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   25 |  for(int i=1;i<=n;i++) scanf("%d",&tree[i].val);
      |                        ~~~~~^~~~~~~~~~~~~~~~~~~
foo.cc:26:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   26 |  for(int i=1;i<=n;i++) scanf("%d %d",&tree[i].leftnum ,&tree[i].rightnum );
      |                        ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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