foo.cc: In function 'int main()':
foo.cc:80:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   80 |     scanf("%d",&n);//n个区间
      |     ~~~~~^~~~~~~~~
foo.cc:83:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   83 |         scanf("%d%d%d",&a[i].left,&a[i].right,&a[i].h);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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Found 10 testcases.
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