foo.c: In function 'main':
foo.c:27:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d", &m, &n);
^~~~~~~~~~~~~~~~~~~~~
foo.c:29:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d", &a[i]);
^~~~~~~~~~~~~~~~~~
foo.c:31:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d", &b[i]);
^~~~~~~~~~~~~~~~~~
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