leetcood学习笔记-53*-最大子列和

题目描述：

 

方法一：O(N)

class Solution(object):
    def maxSubArray(self, nums):
        sum = 0
        max_sub_sum = nums[0]
        for num in nums:
            sum += num
            if sum > max_sub_sum:
                max_sub_sum = sum
            if sum < 0:
                sum = 0
        return max_sub_sum

二：O(N)/O(1)

class Solution(object):
    def maxSubArray(self, nums):
        """
        :type nums: List[int]
        :rtype: int
         """
        for i in range(1, len(nums)):
            nums[i]= nums[i] + max(nums[i-1], 0)
        return max(nums)

三：分治法