LeetCode 1299: Replace Elements with Greatest Element on Right Side Solution

Master LeetCode problem 1299 (Replace Elements with Greatest Element on Right Side), a easy 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.

1299. Replace Elements with Greatest Element on Right Side

Easy

Array

Problem Explanation

Explanation:

Algorithmic Idea:
1. Iterate the array from right to left while keeping track of the maximum element seen so far.
2. Replace each element with the current maximum and update the maximum accordingly.
3. Finally, replace the last element with -1.
Step-by-Step Iterations:
- Input: arr = [17,18,5,4,6,1]
- Iterate from right to left:
  - At index 5: Update element to -1, max = 1
  - At index 4: Update element to 1, max = 6
  - At index 3: Update element to 6, max = 6
  - At index 2: Update element to 6, max = 6
  - At index 1: Update element to 6, max = 18
  - At index 0: Update element to 18
Time Complexity: O(n) where n is the number of elements in the input array.
Space Complexity: O(1) as we are not using any additional data structures.

Solution Code

class Solution {
    public int[] replaceElements(int[] arr) {
        int n = arr.length;
        int max = -1;
        for (int i = n - 1; i >= 0; i--) {
            int temp = arr[i];
            arr[i] = max;
            max = Math.max(max, temp);
        }
        return arr;
    }
}

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