Practice Count Numbers with Unique Digits
Read the task, work through the examples, and check your approach against the constraints. Use the original LeetCode task for coding and submissions.
Problem Statement
Given an integer n, return the count of all numbers with unique digits, x, where 0 <= x < 10^n (10 raised to the power n).
Source: Count Numbers with Unique Digits on LeetCode. Use the original task for its coding environment and submissions.
Examples
# Example 1
Input
n = 2
Output
91
# Example 2
Input
n = 0
Output
1
Constraints
0 <= n <= 8
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