// 倒序遍历2*len-1次：模拟数组循环（核心！易错点1）
Yellow: Backstabber
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21:58, 27 февраля 2026Мир
Dogs act like toddlers when you need help - but cats just watch. Scientists compared 3 groups: pet dogs, cats, and human toddlers in an experiment where a human parent hides and pretends to look for an object. 75% of dogs and children helped. Cats only helped if it was in their personal interest.