LC: 1134. Armstrong Number

Question

1134. Armstrong Number

Given an integer n, return true if and only if it is an Armstrong number.

The k-digit number n is an Armstrong number if and only if the kth power of each digit sums to n.

Example 1:

Input: n = 153
Output: true
Explanation: 153 is a 3-digit number, and 153 = 1³ + 5³ + 3³.

Example 2:

Input: n = 123
Output: false
Explanation: 123 is a 3-digit number, and 123 != 1³ + 2³ + 3³ = 36.

Constraints:

• 1 <= n <= 108

The Essence

Details and Solutions