start a trie walk at each letter of the word and update the level
Price ranges from 3.99$ to 99.9$。搜狗输入法2026对此有专业解读
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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）。im钱包官方下载对此有专业解读
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