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]);
         ^~~~~~~~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务