Maximum Product Subarray

Given an array of integers nums, find the subarray with the largest product and return that product.

A subarray is a run of one or more elements that stand next to each other in nums. Its product is all of its elements multiplied together.

Example 1:

Input: nums = [2, 3, -2, 4]
Output: 6
Explanation: The subarray [2, 3] has the largest product, 2 × 3 = 6. -2 is the only negative number, so every subarray that includes it has a negative product.

Example 2:

Input: nums = [-2, 0, -1]
Output: 0
Explanation: The answer can't be 2: [-2, -1] is not a subarray, because 0 stands between them. The subarray [0] gives 0, and every other subarray gives 0 or less.

Example 3:

Input: nums = [-2, 3, -4]
Output: 24
Explanation: The whole array: the two negative numbers cancel out, -2 × 3 × -4 = 24.

Constraints:

• 1 <= nums.size <= 105
• -10 <= nums[i] <= 10
• The product of any subarray of nums fits in a 32-bit integer.