You are given an integer array
nums. A subsequence of
nums is called a square streak if:
Return the length of the longest square streak in
nums, or return
-1 if there is no square streak.
A subsequence is an array that can be derived from another array by deleting some or no elements without changing the order of the remaining elements.
Input: nums = [4,3,6,16,8,2] Output: 3 Explanation: Choose the subsequence [4,16,2]. After sorting it, it becomes [2,4,16]. - 4 = 2 * 2. - 16 = 4 * 4. Therefore, [4,16,2] is a square streak. It can be shown that every subsequence of length 4 is not a square streak.
Input: nums = [2,3,5,6,7] Output: -1 Explanation: There is no square streak in nums so return -1.
2 <= nums.length <= 105
2 <= nums[i] <= 105