LeetCode 53. Maximum Subarray

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.

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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.

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最大连续公共序列，采用动态规划，O（N）复杂度，优化后O（1）空间复杂度。

public class Solution {    public int maxSubArray(int[] nums) {        if(nums.length  == 0) return 0;        int lastSum = nums[0];        int max = lastSum;        for(int i = 1; i< nums.length; i++){            lastSum = lastSum > 0 ? lastSum+nums[i]:nums[i];            max = max > lastSum ? max : lastSum;        }        return max;    }}