3 ms·

GPT states at the end: > However, in the lines following the removal, P should be replaced with S to maintain correctness.

• bonzini 3y ago
  And that's not enough. Think of the swap sequence t=a,a=b,b=t: all three moves are necessary. While removing moves is a common optimization, it can't be done willy nilly. As mentioned in the comment you replied to, the algorithm is wrong without the extra precondition B<C that is not included in the prompt, as should be clear from the fact that the largest value is computed as max(A,C) rather than max(A,B,C). This is the same precondition that allows to remove the move, effectively computing the smallest value as min(A,B) instead of min(A,B,C). So the only correct answer to the prompt is to find a counterexample which does not sort correctly, for example 3 7 5. Not to remove an instruction randomly.