foo.c: In function 'main':
foo.c:4:1: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d",&n);
 ^~~~~~~~~~~~~~
foo.c:5:23: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
 for(int i=1;i<=n;i++) scanf("%d",&a[i]),pre[i]=pre[i-1]+a[i];
                       ^~~~~~~~~~~~~~~~~
foo.c:6:1: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d",&m);
 ^~~~~~~~~~~~~~
foo.c:9:1: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d%d",&x,&y);
 ^~~~~~~~~~~~~~~~~~~

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