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53. 最大子数组和 #18

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webVueBlog opened this issue Aug 30, 2022 · 0 comments
Open

53. 最大子数组和 #18

webVueBlog opened this issue Aug 30, 2022 · 0 comments

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@webVueBlog
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53. 最大子数组和

Description

Difficulty: 中等

Related Topics: 数组, 分治, 动态规划

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 。

示例 2:

输入:nums = [1]
输出:1

示例 3:

输入:nums = [5,4,-1,7,8]
输出:23

提示:

  • 1 <= nums.length <= 105
  • -104 <= nums[i] <= 104

**进阶:**如果你已经实现复杂度为 O(n) 的解法,尝试使用更为精妙的 分治法 求解。

Solution

Language: JavaScript

/**
 * @param {number[]} nums
 * @return {number}
 */
var maxSubArray = function(nums) {
 let [pre, maxAns] = [0, nums[0]]
 nums.forEach((x) => {
  pre = Math.max(pre + x, x)
  maxAns = Math.max(maxAns, pre)
 })
 return maxAns
};
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