Reduction Operations to Make the Array Elements Equal

Problem

Given an integer array nums, your goal is to make all elements in nums equal. To complete one operation, follow these steps:

Find the largest value in nums. Let its index be i (0-indexed) and its value be largest. If there are multiple elements with the largest value, pick the smallest i.
Find the next largest value in nums strictly smaller than largest. Let its value be nextLargest.
Reduce nums[i] to nextLargest.

Return **the number of operations to make all elements in *nums* equal**.

Example 1:

Input: nums = [5,1,3]
Output: 3
Explanation:&nbsp;It takes 3 operations to make all elements in nums equal:
1. largest = 5 at index 0. nextLargest = 3. Reduce nums[0] to 3. nums = [3,1,3].
2. largest = 3 at index 0. nextLargest = 1. Reduce nums[0] to 1. nums = [1,1,3].
3. largest = 3 at index 2. nextLargest = 1. Reduce nums[2] to 1. nums = [1,1,1].

Example 2:

Input: nums = [1,1,1]
Output: 0
Explanation:&nbsp;All elements in nums are already equal.

Example 3:

Input: nums = [1,1,2,2,3]
Output: 4
Explanation:&nbsp;It takes 4 operations to make all elements in nums equal:
1. largest = 3 at index 4. nextLargest = 2. Reduce nums[4] to 2. nums = [1,1,2,2,2].
2. largest = 2 at index 2. nextLargest = 1. Reduce nums[2] to 1. nums = [1,1,1,2,2].
3. largest = 2 at index 3. nextLargest = 1. Reduce nums[3] to 1. nums = [1,1,1,1,2].
4. largest = 2 at index 4. nextLargest = 1. Reduce nums[4] to 1. nums = [1,1,1,1,1].

Constraints:

1 <= nums.length <= 5 * 104
1 <= nums[i] <= 5 * 104

Solution

/**
 * @param {number[]} nums
 * @return {number}
 */
var reductionOperations = function(nums) {
    nums.sort((a, b) => a - b);
    var uniqueNums = [];
    for (var i = 0; i < nums.length; i++) {
        if (nums[i] === nums[i - 1]) {
            uniqueNums[uniqueNums.length - 1]++;
        } else {
            uniqueNums.push(1);
        }
    }
    var res = 0;
    while (uniqueNums.length > 1) {
        var last = uniqueNums.pop();
        res += last;
        uniqueNums[uniqueNums.length - 1] += last;
    }
    return res;
};

Explain:

nope.

Complexity:

Time complexity : O(n * log(n)).
Space complexity : O(n).