foo.c: In function 'main':
foo.c:23:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
23 | scanf("%d",&n);
| ^~~~~~~~~~~~~~
foo.c:26:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
26 | scanf("%d",&a[i]);
| ^~~~~~~~~~~~~~~~~
foo.c:28:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
28 | scanf("%d ",&x);//这个就是几次
| ^~~~~~~~~~~~~~~
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