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g0201_0300.s0233_number_of_digit_one.readme.md Maven / Gradle / Ivy

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