1819. Number of Different Subsequences GCDs

https://leetcode.com/problems/number-of-different-subsequences-gcds

Description

You are given an array nums that consists of positive integers.

The GCD of a sequence of numbers is defined as the greatest integer that divides all the numbers in the sequence evenly.

• For example, the GCD of the sequence [4,6,16] is 2.

A subsequence of an array is a sequence that can be formed by removing some elements (possibly none) of the array.

• For example, [2,5,10] is a subsequence of [1,2,1,**2**,4,1,**5**,**10**].

Return the number of different GCDs among all non-empty subsequences of nums.

Example 1:

**Input:** nums = [6,10,3]
**Output:** 5
**Explanation:** The figure shows all the non-empty subsequences and their GCDs.
The different GCDs are 6, 10, 3, 2, and 1.

Example 2:

**Input:** nums = [5,15,40,5,6]
**Output:** 7

Constraints:

• 1 <= nums.length <= 105

• 1 <= nums[i] <= 2 * 105

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