Given an integer array nums, find the contiguous subarray (containing at least one number) which has the largest sum and return its sum.


Input: [-2,1,-3,4,-1,2,1,-5,4],
Output: 6
Explanation: [4,-1,2,1] has the largest sum = 6.

Follow up:
If you have figured out the O(n) solution, try coding another solution using the divide and conquer approach, which is more subtle.


func max(a, b int) int {
    if a > b {
        return a
    return b

func maxSubArray(nums []int) int {
    currentSubSum := nums[0]
    maxValue := nums[0]
    lenN := len(nums)
    for i := 1; i < lenN; i++ {
        currentSubSum = max(nums[i], currentSubSum + nums[i])
        maxValue = max(maxValue, currentSubSum)
    return maxValue