foo.cc: In function ‘int main()’:
foo.cc:17:9: warning: ‘cj’ may be used uninitialized [-Wmaybe-uninitialized]
   17 |         if(a[i]!=cj)
      |         ^~
foo.cc:5:23: note: ‘cj’ was declared here
    5 |     int rx,xh,a[1001],cj,sum=0;
      |                       ^~