foo.cc: In function 'int main()':
foo.cc:44:61: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::priority_queue<int>::size_type {aka long unsigned int}' [-Wformat=]
 printf("%d",q.size/*返回优先队列中的元素个数*/());
             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
foo.cc:20:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d",&n);
 ~~~~~^~~~~~~~~
foo.cc:22:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d %d",&a[i].h,&a[i].t);
 ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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