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LeetCode 2659: Make Array Empty Solution

Master LeetCode problem 2659 (Make Array Empty), a hard challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

Problem Explanation

Explanation:

To solve this problem, we can simulate the process of removing elements from the array according to the given rules. We can use a deque (double-ended queue) data structure to efficiently manipulate the array elements.

  1. Initialize a deque to store the numbers from the input array.
  2. Initialize a variable to keep track of the number of operations.
  3. Iterate until the deque is not empty:
    • Check if the first element in the deque is the smallest value.
    • If it is the smallest value, remove it from the deque.
    • If it is not the smallest value, move it to the end of the deque.
    • Increment the number of operations.
  4. Return the total number of operations.

Time complexity: O(nlogn) where n is the number of elements in the array. The time complexity is dominated by the sorting operation to check the smallest element. Space complexity: O(n) for the deque to store the elements.

:

Solution Code

import java.util.ArrayDeque;
import java.util.Deque;
import java.util.Arrays;

class Solution {
    public int makeArrayEmpty(int[] nums) {
        Deque<Integer> deque = new ArrayDeque<>();
        for (int num : nums) {
            deque.add(num);
        }
        Arrays.sort(nums);
        int operations = 0;
        while (!deque.isEmpty()) {
            if (deque.peekFirst() == nums[0]) {
                deque.pollFirst();
                nums = Arrays.copyOfRange(nums, 1, nums.length);
            } else {
                int first = deque.pollFirst();
                deque.addLast(first);
            }
            operations++;
        }
        return operations;
    }
}

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