foo.c: In function 'main':
foo.c:5:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&c);
  ^~~~~~~~~~~~~~~~~~~
foo.c:6:22: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=0;i<n;++i)scanf("%d",&w[i]);
                      ^~~~~~~~~~~~~~~~~

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