foo.c: In function 'main':
foo.c:20:9: warning: 'b' may be used uninitialized [-Wmaybe-uninitialized]
   20 |         printf("%d",b);
      |         ^~~~~~~~~~~~~~
foo.c:4:19: note: 'b' was declared here
    4 |         int n,a=0,b,t=1,c=1;
      |                   ^

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