foo.c: In function 'main':
foo.c:33:7: warning: unused variable 'm' [-Wunused-variable]
  char m;
       ^
foo.c:34:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ^~~~~~~~~~~~~~
foo.c:40:4: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%c",&d[i][j]);
    ^~~~~~~~~~~~~~~~~~~~

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