#1299 - Replace Elements with Greatest Element on Right Side

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Problem Description

Given an array arr, replace every element in that array with the greatest element among the elements to its right, and replace the last element with -1.

After doing so, return the array.

Solution

/**
 * @param {number[]} arr
 * @return {number[]}
 */
var replaceElements = function(arr) {
  let maxRight = -1;
  for (let i = arr.length - 1; i >= 0; i--) {
    const current = arr[i];
    arr[i] = maxRight;
    maxRight = Math.max(maxRight, current);
  }
  return arr;
};