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 java.lang.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)