foo.c: In function 'main':
foo.c:25:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &m, &n);
  ^~~~~~~~~~~~~~~~~~~~~
foo.c:28:4: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d", &sz[i][j]);
    ^~~~~~~~~~~~~~~~~~~~~~
foo.c:33:4: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d", &sd[i][j]);
    ^~~~~~~~~~~~~~~~~~~~~~
foo.c:37:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d", &a, &b, &k);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~

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