[LeetCode] Maximum Product Subarray

Problem:

Find the contiguous subarray within an array (containing at least one number) which has the largest product.
For example, given the array [2,3,-2,4],
the contiguous subarray [2,3] has the largest product = 6.

Java Code:

public class Solution {
    public int maxProduct(int[] A) {
        if (A == null || A.length == 0) {
            return 0;
        } else if (A.length == 1) {
            return A[0];
        }
        
        int length = A.length;
        int [] sMax = new int[length];
        int [] sMin = new int[length];
        int maxProduct = A[0];
        
        sMax[0] = A[0];
        sMin[0] = A[0];
        for (int i = 1; i < length; i++) {
            sMax[i] = Math.max(Math.max(sMax[i - 1] * A[i], sMin[i - 1] * A[i]), A[i]);
            sMin[i] = Math.min(Math.min(sMax[i - 1] * A[i], sMin[i - 1] * A[i]), A[i]);
            maxProduct = Math.max(maxProduct, sMax[i]);
        }
        
        return maxProduct;
    }
}