Maximum Product Subarray

Maximum Product Subarray array

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.

public class MaximumProductSubarray {
    public int maxProduct(int[] nums) {
        if(nums == null || nums.length == 0) {
            return 0;
        }

        int result = nums[0];
        int max = nums[0];
        int min = nums[0];

        for(int i = 1; i < nums.length; i++) {
            int temp = max;
            max = Math.max(Math.max(nums[i] * max, nums[i] * min), nums[i]);
            min = Math.min(Math.min(nums[i] * temp, nums[i] * min), nums[i]);

            if(max > result) {
                result = max;
            }
        }

        return result;
    }
}

Last modified October 4, 2020