Package g0301_0400.s0357_count_numbers_with_unique_digits

Class Solution

java.lang.Object

g0301_0400.s0357_count_numbers_with_unique_digits.Solution

public class Solution
extends Object

357 - Count Numbers with Unique Digits.

Medium

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 \u2264 x < 100, excluding 11,22,33,44,55,66,77,88,99

Example 2:

Input: n = 0

Output: 1

Constraints:

• 0 <= n <= 8

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
int	countNumbersWithUniqueDigits(int n)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Solution

public Solution()

Method Details

countNumbersWithUniqueDigits

public int countNumbersWithUniqueDigits(int n)