leetcode53-Maximum Subarray

2024-05-07 00:36
文章标签 maximum subarray leetcode53

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题目

给你一个整数数组 nums ,请你找出一个具有最大和的连续子数组(子数组最少包含一个元素),返回其最大和。
子数组
是数组中的一个连续部分。
示例 1:
输入:nums = [-2,1,-3,4,-1,2,1,-5,4]
输出:6
解释:连续子数组 [4,-1,2,1] 的和最大,为 6 。

分析

求连续子数组的和,我们可以用一个变量cur记录连续子数组的最大和,当cur加上当前元素比当前元素还要小的时候说明不能再继续累加了,往后遍历的时候就应该用当前元素的值作为cur的初始值。同时遍历的过程中不停的取cur的最大值

public class maximumSubarray {public static void main(String[] args) {int[] arr = {-2,1,-3,4,-1,2,1,-5,4};System.out.println(getMax(arr));}public static int getMax(int[] arr) {int len = arr.length;int cur = 0;int res = 0;for(int i = 0;i<len;i++) {cur = Math.max(cur+arr[i],arr[i]);res = Math.max(res,cur);}return res;}
}

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