You are given an integer array nums
. We call a subset of nums
good if its product can be represented as a product of one or more distinct prime numbers.
nums = [1, 2, 3, 4]
:
[2, 3]
, [1, 2, 3]
, and [1, 3]
are good subsets with products 6 = 2*3
, 6 = 2*3
, and 3 = 3
respectively.[1, 4]
and [4]
are not good subsets with products 4 = 2*2
and 4 = 2*2
respectively.Return the number of different good subsets in nums
modulo 109 + 7
.
A subset of nums
is any array that can be obtained by deleting some (possibly none or all) elements from nums
. Two subsets are different if and only if the chosen indices to delete are different.
Example 1:
Input: nums = [1,2,3,4] Output: 6 Explanation: The good subsets are: - [1,2]: product is 2, which is the product of distinct prime 2. - [1,2,3]: product is 6, which is the product of distinct primes 2 and 3. - [1,3]: product is 3, which is the product of distinct prime 3. - [2]: product is 2, which is the product of distinct prime 2. - [2,3]: product is 6, which is the product of distinct primes 2 and 3. - [3]: product is 3, which is the product of distinct prime 3.
Example 2:
Input: nums = [4,2,3,15] Output: 5 Explanation: The good subsets are: - [2]: product is 2, which is the product of distinct prime 2. - [2,3]: product is 6, which is the product of distinct primes 2 and 3. - [2,15]: product is 30, which is the product of distinct primes 2, 3, and 5. - [3]: product is 3, which is the product of distinct prime 3. - [15]: product is 15, which is the product of distinct primes 3 and 5.
Constraints:
1 <= nums.length <= 105
1 <= nums[i] <= 30