foo.c: In function 'main':
foo.c:14:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   14 |  scanf("%d",&n);
      |  ^~~~~~~~~~~~~~
foo.c:17:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   17 |   scanf("%d %d",&a[i],&b[i]);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c:62:5: warning: 'mu' may be used uninitialized in this function [-Wmaybe-uninitialized]
   62 |   if(c<d)
      |     ^
foo.c:10:6: note: 'mu' was declared here
   10 |  int mu,zi=0;
      |      ^~

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