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Java Solution for LeetCode algorithm problems, continually updating
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233\. Number of Digit One
Hard
Given an integer `n`, count _the total number of digit_ `1` _appearing in all non-negative integers less than or equal to_ `n`.
**Example 1:**
**Input:** n = 13
**Output:** 6
**Example 2:**
**Input:** n = 0
**Output:** 0
**Constraints:**
* 0 <= n <= 109