#357
Count Numbers with Unique Digits
specialist · 855 · lc medium +31 · verified · 55.4% accepted · 1,706 likes · top 49%
Description
Given an integer n, return the count of all numbers with unique digits, x, where 0 <= x < 10n.
Example 1:
Input: n = 2
Output: 91
Explanation: The answer should be the total numbers in the range of 0 ≤ x < 100, excluding 11,22,33,44,55,66,77,88,99
Example 2:
Input: n = 0
Output: 1
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