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Given an integer array
nums, find the contiguous subarray (containing at least one number) which has the largest sum and return its sum.
A subarray is a contiguous part of an array.
Input: nums = [-2,1,-3,4,-1,2,1,-5,4] Output: 6 Explanation: [4,-1,2,1] has the largest sum = 6.
Input: nums =  Output: 1
Input: nums = [5,4,-1,7,8] Output: 23
1 <= nums.length <= 105
-104 <= nums[i] <= 104
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.