Maximum Subarray in python

题目链接

https://leetcode.com/explore/interview/card/top-interview-questions-easy/97/dynamic-programming/566/

解题思路

遍历数组逐个叠加,
如果出现叠加值为负,则更新为当前index值;
为正,则继续叠加。
同时,判断是否为目前最大和,若是,则更新最大值。
最终,返回记录的最大值。

代码

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

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