// ⚠️ 易错点3：此处返回n而非0（完全有序无需排序，长度为0）
Number (2): Everything in this space must add up to 2. The answer is 1-0, placed vertically; 6-2, placed vertically.
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Wallace previously said he was "deeply sorry for any distress" he caused and that he "never set out to harm or humiliate".
curr = curr-next;