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.
\n\n\n
Example 1:
\n\n\nInput: nums = [-2,1,-3,4,-1,2,1,-5,4]\nOutput: 6\nExplanation: [4,-1,2,1] has the largest sum = 6.\n\n\n
Example 2:
\n\n\nInput: nums = [1]\nOutput: 1\n\n\n
Example 3:
\n\n\nInput: nums = [5,4,-1,7,8]\nOutput: 23\n\n\n
\n
Constraints:
\n\n1 <= nums.length <= 105-104 <= nums[i] <= 104\n
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.
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