foo.c: In function 'main':
foo.c:5:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d\n",&m,&n,&p);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c:7:27: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    for (int j=1;j<=n;j++) scanf("%d",&a[i][j]);
                           ^~~~~~~~~~~~~~~~~~~~
foo.c:9:27: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    for (int j=1;j<=p;j++) scanf("%d",&b[i][j]);
                           ^~~~~~~~~~~~~~~~~~~~

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