developed by an IBM researcher named Horst Feistel. Feistel, for silly reasons,
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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），详情可参考Line官方版本下载
Cyrillic homoglyphs: the real threat，这一点在同城约会中也有详细论述