Method maxSubArray

src/com/blankj/easy/_0053/Solution.java:20–22

(int[] nums)

//        return max;
//    }
    public int maxSubArray(int[] nums) {
        return helper(nums, 0, nums.length - 1);
    }

    private int helper(int[] nums, int left, int right) {
        if (left >= right) return nums[left];