2460.js

/** ------------------------------------------------------------------------------
 * 
 * 2460. Apply Operations to an Array
 * Topics: Array, Two Pointers
 * https://leetcode.com/problems/apply-operations-to-an-array/description/
 * 
 ------------------------------------------------------------------------------ */
/**
 * @param {number[]} nums
 * @return {number[]}
 */
var applyOperations = function (nums) {
  for (let i = 0; i < nums.length - 1; i++) {
    if (nums[i] === nums[i + 1]) {
      nums[i] = nums[i] * 2
      nums[i + 1] = 0
    }
  }

  let pointer = 0
  for (let i = 0; i < nums.length; i++) {
    if (nums[i] !== 0) {
      // let temp = nums[i]
      // nums[i] = nums[pointer]
      // nums[pointer] = temp
      ;[nums[pointer], nums[i]] = [nums[i], nums[pointer]]
      pointer++
    }
  }

  return nums
}

console.log(applyOperations([1, 2, 2, 1, 1, 0]))