2501.js

/** ------------------------------------------------------------------------------
 * 
 * 2501. Longest Square Streak in an Array
 * Topics: Array
 * https://leetcode.com/problems/longest-square-streak-in-an-array/description/?envType=daily-question&envId=2024-10-28
 * 
 ------------------------------------------------------------------------------ */
/**
 * @param {number[]} nums
 * @return {number}
 */
var longestSquareStreak = function (nums) {
  const set = new Set(nums)
  let max = -1

  for (let num of nums) {
    let count = 0
    while (set.has(num)) {
      num = num * num
      count++
    }

    if (count > 1) {
      max = Math.max(max, count)
    }
  }

  return max
}