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357. Count Numbers with Unique Digits

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Description

Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x < 10ⁿ.

Example:

Input: 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

Solutions

Python3

Java

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