Write a function that can return the number of times that ____ appears in a number.

Write a function that can return the number of times that ____ appears in a number.

题目类型: 技术面试题

这是一道技术面试题，常见于澳洲IT公司面试中。

难度: medium

分类: problem-solving

标签: Apple SWE, Algorithms

目标岗位: Software Engineer

目标公司: Apple

参考答案摘要

解题思路：Digit-count problem: for digit d in [0..9], count occurrences from 0..n using positional math (higher/cur/lower). O(log n).

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