Difference Between Element Sum and Digit Sum of an Array

You are given a positive integer array nums.

• The element sum is the sum of all the elements in nums.

• The digit sum is the sum of all the digits (not necessarily distinct) that appear in nums.

Return the absolute difference between the element sum and digit sum of nums.

Note that the absolute difference between two integers x and y is defined as |x - y|.

LeetCode Problem - 2535

class Solution {

    // Method to calculate the sum of digits of a number
    public static int digiSum(int num) {
        int sum = 0;
        while(num > 0) {
            int rem = num % 10;
            sum = sum + rem;
            num = num / 10;
        }
        return sum;
    }

    // Method to find the absolute difference between the sum of elements and the sum of their digits
    public int differenceOfSum(int[] nums) {
        int eleSum = 0, digitSum = 0;

        // Loop through each element in the array
        for(int i = 0; i < nums.length; i++) {   
            int num = nums[i];

            // Add the element to the element sum
            eleSum += nums[i]; 

            // Calculate the sum of digits of the current element and add it to digitSum
            digitSum += Solution.digiSum(num);
        }

        // Return the absolute difference between the sum of elements and the sum of their digits
        return Math.abs(eleSum - digitSum);
    }
}