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31 lines
866 B
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31 lines
866 B
HTML
<p>一只青蛙一次可以跳上1级台阶，也可以跳上2级台阶。求该青蛙跳上一个 <code>n</code> 级的台阶总共有多少种跳法。</p>
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<p>答案需要取模 1e9+7（1000000007），如计算初始结果为：1000000008，请返回 1。</p>
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<p><strong>示例 1：</strong></p>
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<pre><strong>输入：</strong>n = 2
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<strong>输出：</strong>2
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</pre>
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<p><strong>示例 2：</strong></p>
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<pre><strong>输入：</strong>n = 7
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<strong>输出：</strong>21
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</pre>
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<p><strong>示例 3：</strong></p>
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<pre><strong>输入：</strong>n = 0
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<strong>输出：</strong>1</pre>
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<p><strong>提示：</strong></p>
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<ul>
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<li><code>0 <= n <= 100</code></li>
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</ul>
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<p>注意：本题与主站 70 题相同：<a href="https://leetcode-cn.com/problems/climbing-stairs/">https://leetcode-cn.com/problems/climbing-stairs/</a></p>
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<p> </p>
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