foo.cc: In function 'int main()':
foo.cc:99:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   99 |     scanf("%d%d",&n,&k);m=n;n*=3;
      |     ~~~~~^~~~~~~~~~~~~~
foo.cc:101:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  101 |         scanf("%d",&a[i]);
      |         ~~~~~^~~~~~~~~~~~

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