foo.c: In function 'main':
foo.c:68:17: warning: 'ch1' may be used uninitialized [-Wmaybe-uninitialized]
   68 |                 printf("%d ", ch1[s]);
      |                 ^~~~~~~~~~~~~~~~~~~~~
foo.c:11:13: note: 'ch1' declared here
   11 |         int ch1[10000];
      |             ^~~

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