Tens of thousands of years ago, as modern humans migrated into northerly territories inhabited by our ancient cousins, the Neanderthals, the two species met – and sometimes mated.
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// ⚠️ 易错点2：循环条件写left <= n-1（会导致left+1越界），或把<=写成<（漏判相等的有序情况）
with the flexibility and complexity that entails.