foo.c: In function 'main':
foo.c:7:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    7 |  scanf("%d%d%d",&m,&n,&p);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~
foo.c:13:4: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   13 |    scanf("%d",&a[i][j]);
      |    ^~~~~~~~~~~~~~~~~~~~
foo.c:20:4: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   20 |    scanf("%d",&b[i][j]);
      |    ^~~~~~~~~~~~~~~~~~~~

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