foo.c: In function 'main':
foo.c:26:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   26 |     scanf("%d%d",&a,&b);
      |     ^~~~~~~~~~~~~~~~~~~
foo.c:29:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   29 |         scanf("%d",&m[i]);
      |         ^~~~~~~~~~~~~~~~~
foo.c:38:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   38 |         scanf("%d",&n[j]);
      |         ^~~~~~~~~~~~~~~~~

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