Leetcode•Jan 17, 2026
Add to Array-Form of Integer
Hazrat Ali
Leetcode
The array-form of an integer num is an array representing its digits in left to right order.
- For example, for
num = 1321, the array form is[1,3,2,1].
Given num, the array-form of an integer, and an integer k, return the array-form of the integer num + k.
Example 1:
Input: num = [1,2,0,0], k = 34 Output: [1,2,3,4] Explanation: 1200 + 34 = 1234
Example 2:
Input: num = [2,7,4], k = 181 Output: [4,5,5] Explanation: 274 + 181 = 455
Example 3:
Input: num = [2,1,5], k = 806 Output: [1,0,2,1] Explanation: 215 + 806 = 1021
Solution
var addToArrayForm = function(num, k) {
let i = num.length - 1;
let carry = k;
let result = [];
while (i >= 0 || carry > 0) {
if (i >= 0) {
carry += num[i];
i--;
}
result.push(carry % 10);
carry = Math.floor(carry / 10);
}
return result.reverse();
};