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leetcode-problemset/leetcode-cn/problem (Chinese)/爬楼梯 [climbing-stairs].html
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<p>假设你正在爬楼梯。需要 <code>n</code>&nbsp;阶你才能到达楼顶。</p>
<p>每次你可以爬 <code>1</code><code>2</code> 个台阶。你有多少种不同的方法可以爬到楼顶呢?</p>
<p>&nbsp;</p>
<p><strong>示例 1</strong></p>
<pre>
<strong>输入:</strong>n = 2
<strong>输出:</strong>2
<strong>解释:</strong>有两种方法可以爬到楼顶。
1. 1 阶 + 1 阶
2. 2 阶</pre>
<p><strong>示例 2</strong></p>
<pre>
<strong>输入:</strong>n = 3
<strong>输出:</strong>3
<strong>解释:</strong>有三种方法可以爬到楼顶。
1. 1 阶 + 1 阶 + 1 阶
2. 1 阶 + 2 阶
3. 2 阶 + 1 阶
</pre>
<p>&nbsp;</p>
<p><strong>提示:</strong></p>
<ul>
<li><code>1 &lt;= n &lt;= 45</code></li>
</ul>