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Commit 7e846a4

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add LeetCode 70. 爬楼梯
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‎DP/LeetCode 70. 爬楼梯.md

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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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假设你正在爬楼梯。需要 n 阶你才能到达楼顶。
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每次你可以爬 1 或 2 个台阶。你有多少种不同的方法可以爬到楼顶呢?
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注意:给定 n 是一个正整数。
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示例 1:
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```javascript
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输入: 2
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输出: 2
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解释: 有两种方法可以爬到楼顶。
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1. 1+ 1
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2. 2
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```
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示例 2:
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```javascript
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输入: 3
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输出: 3
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解释: 有三种方法可以爬到楼顶。
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1. 1+ 1+ 1
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2. 1+ 2
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3. 2+ 1
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```
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来源:力扣(LeetCode)
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链接:https://leetcode-cn.com/problems/climbing-stairs
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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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到达第n阶楼梯有从n-1阶走一步和从第n-2阶走两步两种情况
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```javascript
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/**
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* @param {number} n
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* @return {number}
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*/
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var climbStairs = function (n) {
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let dp = new Array(n);
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dp[1] = 1;
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dp[2] = 2;
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for (let i = 3; i <= n; i++) { // 到达第n阶楼梯有从n-1阶走一步和从第n-2阶走两步两种情况
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dp[i] = dp[i - 1] + dp[i - 2];
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}
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return dp[n];
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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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