foo.cc: In function 'int main()':
foo.cc:12:7: error: 'k' was not declared in this scope
   12 |   a[++k]=xx/10;
      |       ^
foo.cc:17:3: error: 'ans' was not declared in this scope; did you mean 'abs'?
   17 |   ans++;
      |   ^~~
      |   abs

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