152.[LeetCode] Maximum Product Subarray

Given an integer array nums, find the contiguous subarray within an array (containing at least one number) which has the largest product.

Example 1:

Input: [2,3,-2,4]
Output: 6
Explanation: [2,3] has the largest product 6.

Example 2:

Input: [-2,0,-1]
Output: 0
Explanation: The result cannot be 2, because [-2,-1] is not a subarray.

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class Solution {
public:
    int maxProduct(vector<int>& nums) {
        int ans=nums[],frontprod=,backprod=;
        int n=nums.size();
        for(int i=;i<n;i++){
            frontprod*=nums[i];
            backprod*=nums[n-i-];
            ans=max(ans,max(frontprod,backprod));
            frontprod=frontprod ==  ? :frontprod;
            backprod=backprod ==  ?  : backprod;

        }
       return ans;
    }
};