foo.cc: In function 'int main()':
foo.cc:42:11: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::priority_queue<int>::size_type' {aka 'long unsigned int'} [-Wformat=]
   42 |  printf("%d",q.size());
      |          ~^  ~~~~~~~~
      |           |        |
      |           int      std::priority_queue<int>::size_type {aka long unsigned int}
      |          %ld
foo.cc:18:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   18 |  scanf("%d",&n);
      |  ~~~~~^~~~~~~~~
foo.cc:20:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   20 |   scanf("%d %d",&a[i].h,&a[i].t);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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