233. Number of Digit One（统计1出现的次数）

Given an integer n, count the total number of digit 1 appearing in all non-negative integers less than or equal to n.

For example:
Given n = 13,
Return 6, because digit 1 occurred in the following numbers: 1, 10, 11, 12, 13.

按不同位置统计

31456 统计百位时：

（0-31） 1 （0-99） 32*100次

31156：

（0-30）1（0-99） + (31)  1  （0-56）  31*100+56+1次

31056：

（0-30）1  （0-99) _31*100 次

原文地址：https://www.cnblogs.com/zle1992/p/8543817.html

时间： 2024-08-02 03:02:29

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