foo.cc: In function 'int main()':
foo.cc:22:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   22 |  scanf("%d %d",&n,&m); //读入
      |  ~~~~~^~~~~~~~~~~~~~~
foo.cc:25:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   25 |      scanf("%d",&a[i]); //还是读入
      |      ~~~~~^~~~~~~~~~~~
foo.cc:29:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   29 |   scanf("%d",&q);
      |   ~~~~~^~~~~~~~~

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