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leetcode-cn/problem (Chinese)/杨辉三角 [pascals-triangle].html Normal file
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<p>给定一个非负整数 <em><code>numRows</code>，</em>生成「杨辉三角」的前 <em><code>numRows</code> </em>行。</p>
<p><small>在「杨辉三角」中，每个数是它左上方和右上方的数的和。</small></p>
<p><img alt="" src="https://pic.leetcode-cn.com/1626927345-DZmfxB-PascalTriangleAnimated2.gif" /></p>
<p> </p>
<p><strong>示例 1:</strong></p>
<pre>
<strong>输入:</strong> numRows = 5
<strong>输出:</strong> [[1],[1,1],[1,2,1],[1,3,3,1],[1,4,6,4,1]]
</pre>
<p><strong>示例 2:</strong></p>
<pre>
<strong>输入:</strong> numRows = 1
<strong>输出:</strong> [[1]]
</pre>
<p> </p>
<p><strong>提示:</strong></p>
<ul>
<li><code>1 <= numRows <= 30</code></li>
</ul>