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可以优化
脏词库的子节点一般都比较少, 可以使用vector来存储, 通过lower_bound来查找, 同样是LogN的时间复杂度,但是效率比map应该要高一点.
子节点里面存一个char, 会把一个中文字, 拆分成多个char, 通常是3个以上, 增加了树的高度, 可以考虑使用wchar_t, 这样一个中文字就一个字符, 树的高度减半, 减少匹配次数.
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