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Commit 8b59803

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add LeetCode 209. 长度最小的子数组
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![](https://imgconvert.csdnimg.cn/aHR0cHM6Ly9jZG4uanNkZWxpdnIubmV0L2doL2Nob2NvbGF0ZTE5OTkvY2RuL2ltZy8yMDIwMDgyODE0NTUyMS5qcGc?x-oss-process=image/format,png)
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>仰望星空的人,不应该被嘲笑
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## 题目描述
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给定一个含有 n 个正整数的数组和一个正整数 s ,找出该数组中满足其和 ≥ s 的长度最小的 连续 子数组,并返回其长度。如果不存在符合条件的子数组,返回 0。
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示例:
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```javascript
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输入:s = 7, nums = [2,3,1,2,4,3]
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输出:2
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解释:子数组 [4,3] 是该条件下的长度最小的子数组。
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```
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进阶:
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- 如果你已经完成了 O(n) 时间复杂度的解法, 请尝试 O(n log n) 时间复杂度的解法。
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来源:力扣(LeetCode)
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链接:https://leetcode-cn.com/problems/minimum-size-subarray-sum
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著作权归领扣网络所有。商业转载请联系官方授权,非商业转载请注明出处。
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## 解题思路
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滑动窗口,利用双指针实现,从左到右看,满足条件就把左指针左移,找到最小的长度,然后每次窗口右指针都往右滑动,直到数组末尾。
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```javascript
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/**
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* @param {number} s
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* @param {number[]} nums
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* @return {number}
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*/
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var minSubArrayLen = function (s, nums) {
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let len = nums.length;
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let L = 0, R = 0;
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let res = Infinity, sum = 0;
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while (R < len) {
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sum += nums[R];
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while (sum >= s) { // 滑动窗口
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res = Math.min(res, R - L + 1);
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sum -= nums[L];
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L++;
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}
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R++;
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}
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return res == Infinity ? 0 : res; // 判断合法性
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};
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```
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## 最后
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文章产出不易,还望各位小伙伴们支持一波!
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往期精选:
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<a href="https://github.com/Chocolate1999/Front-end-learning-to-organize-notes">小狮子前端の笔记仓库</a>
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<a href="https://github.com/Chocolate1999/leetcode-javascript">leetcode-javascript:LeetCode 力扣的 JavaScript 解题仓库,前端刷题路线(思维导图)</a>
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小伙伴们可以在Issues中提交自己的解题代码,🤝 欢迎Contributing,可打卡刷题,Give a ⭐️ if this project helped you!
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<a href="https://yangchaoyi.vip/">访问超逸の博客</a>,方便小伙伴阅读玩耍~
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![](https://img-blog.csdnimg.cn/2020090211491121.png#pic_center)
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```javascript
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学如逆水行舟,不进则退
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```
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