foo.cc: In function 'int main()':
foo.cc:13:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   13 |     int n,k,cnt=0; scanf("%d%d",&n,&k);
      |                    ~~~~~^~~~~~~~~~~~~~
foo.cc:14:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   14 |     for(int i=1;i<=n;i++) scanf("%d",&a[i]);
      |                           ~~~~~^~~~~~~~~~~~

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