mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-01-10 18:48:13 +08:00
23 lines
588 B
HTML
23 lines
588 B
HTML
<p>三步问题。有个小孩正在上楼梯，楼梯有n阶台阶，小孩一次可以上1阶、2阶或3阶。实现一种方法，计算小孩有多少种上楼梯的方式。结果可能很大，你需要对结果模1000000007。</p>
|
||
|
||
<p> <strong>示例1:</strong></p>
|
||
|
||
<pre>
|
||
<strong> 输入</strong>：n = 3
|
||
<strong> 输出</strong>：4
|
||
<strong> 说明</strong>: 有四种走法
|
||
</pre>
|
||
|
||
<p> <strong>示例2:</strong></p>
|
||
|
||
<pre>
|
||
<strong> 输入</strong>：n = 5
|
||
<strong> 输出</strong>：13
|
||
</pre>
|
||
|
||
<p> <strong>提示:</strong></p>
|
||
|
||
<ol>
|
||
<li>n范围在[1, 1000000]之间</li>
|
||
</ol>
|