【LeetCode】Maximum Subarray

http://oj.leetcode.com/problems/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.

 

public class Solution {
    public int maxSubArray(int[] A) {
        if(A.length==0)
            return 0;
        int max=A[0];
        int sum = A[0];
        for(int i=1;i<A.length;i++){
            if(A[i]>=0){
                if(sum<0){
                    sum=A[i];
                    if(max<sum){
                        max = sum;
                    }
                }else{
                    sum+=A[i];
                    if(max<sum){
                        max=sum;
                    }
                }
            }else{
                sum+=A[i];
                if(sum<=0){
                    sum=A[i];
                    if(sum>max){
                        max=sum;
                    }
                }else{
                    if(sum>max){
                        max=sum;
                    }
                }
            }
        }
        
        return max;
        
    }
}