description:
Given an array of integers, find a contiguous subarray which has the largest sum.
Notice
The subarray should contain at least one number.
Have you met this question in a real interview? Yes
Example
Given the array [−2,2,−3,4,−1,2,1,−5,3], the contiguous subarray [4,−1,2,1] has the largest sum = 6.
解题思路:使用滑窗法,进行处理。当算计算的值比原有的值小的时候,要进行最大值回滚。同时还要有一个全局的变量来进行最大值的记录。
public class Solution {
/**
* @param nums: A list of integers
* @return: A integer indicate the sum of max subarray
*/
public int maxSubArray(int[] nums) {
// write your code
if (nums == null || nums.length == 0) {
return 0;
}
int max = Integer.MIN_VALUE;
int sum = 0;
for (int i = 0; i < nums.length; i++) {
sum += nums[i];
max = Math.max(sum, max);
sum = Math.max(0, sum);
}
return max;
}
}