foo.c: In function 'main':
foo.c:6:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    6 |     scanf("%d%d%d",&m,&n,&p);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~
foo.c:12:13: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   12 |             scanf("%d",&a[i][j]);
      |             ^~~~~~~~~~~~~~~~~~~~
foo.c:15:13: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   15 |             scanf("%d",&b[i][j]);
      |             ^~~~~~~~~~~~~~~~~~~~

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