Leetcode #357 Count Numbers with Unique Digits
2016-09-25 22:38
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问题描述:
Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x n.
Example:
Given n = 2, return 91. (The answer should be the total numbers in the range of 0 ≤ x < 10
Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x n.
Example:
Given n = 2, return 91. (The answer should be the total numbers in the range of 0 ≤ x < 10
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