leetcode 【 Maximum Subarray 】python 实现

题目：

Find the contiguous subarray within an array (containing at least one number) which has the largest sum.

For example, given the array [−2,1,−3,4,−1,2,1,−5,4],
the contiguous subarray [4,−1,2,1] has the largest sum = 6.

click to show more practice.

More practice:

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

 

代码：oj测试通过 Runtime: 80 ms

class Solution:
    # @param A, a list of integers
    # @return an integer
    def maxSubArray(self, A):
        curr_sum = 0
        max_sum = -100000
        for i in range(len(A)):
            if curr_sum < 0 :
                curr_sum = 0
            curr_sum = curr_sum + A[i]
            max_sum = max(curr_sum, max_sum)
        return max_sum

 

思路：

想不出来这种精妙的算法。

隔了一天Google到了一篇解释日志：

http://blog.csdn.net/linhuanmars/article/details/21314059

这个把这道题的背后思想解释的很好，有些受益。