233. Number of Digit One

LeetCodeMathDynamic ProgrammingRecursionOpen on judge ↗

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

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solution.cppC++17

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