foo.c: In function 'main':
foo.c:24:12: error: 't' undeclared (first use in this function)
   24 |  for(j=1;j<t;j++)
      |            ^
foo.c:24:12: note: each undeclared identifier is reported only once for each function it appears in
foo.c:22:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   22 |  scanf("%d%d%d",&n,&x,&y);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~

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