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目前大家经常使用的Excel列名与列号转换算法都至少包含一个循环算法的时间复杂度远大于O(1),众所周知Excel的列数是有上限的,既然是有穷的那么很显然我们可以做到O(1)转换列名与列号。 首先我们获取列号的上限,打开Excel按 Ctrl + → 切换到最后一列发现列名为XFD 通过常
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