53. Maximum Subarray java solutions

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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 1 public class Solution {
 2     public int maxSubArray(int[] nums) {
 3         if(nums == null) return 0;
 4         if(nums.length == 1) return nums[0];
 5         int curmax = 0;
 6         int ans = Integer.MIN_VALUE;
 7         for(int i = 0;i<nums.length;i++){
 8             curmax += nums[i];
 9             ans = Math.max(curmax,ans);
10             if(curmax < 0) curmax = 0;
11         }
12         return ans;
13     }
14 }

使用DP即可。

如果要求的是subarray的 的起始位置，则需要加上 startIndex， 和endIndex变量。即可得出。