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算法题（国外版）/arranging-coins.html Normal file
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<p>You have <code>n</code> coins and you want to build a staircase with these coins. The staircase consists of <code>k</code> rows where the <code>i<sup>th</sup></code> row has exactly <code>i</code> coins. The last row of the staircase <strong>may be</strong> incomplete.</p>
<p>Given the integer <code>n</code>, return <em>the number of <strong>complete rows</strong> of the staircase you will build</em>.</p>
<p>&nbsp;</p>
<p><strong>Example 1:</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2021/04/09/arrangecoins1-grid.jpg" style="width: 253px; height: 253px;" />
<pre>
<strong>Input:</strong> n = 5
<strong>Output:</strong> 2
<strong>Explanation:</strong> Because the 3<sup>rd</sup> row is incomplete, we return 2.
</pre>
<p><strong>Example 2:</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2021/04/09/arrangecoins2-grid.jpg" style="width: 333px; height: 333px;" />
<pre>
<strong>Input:</strong> n = 8
<strong>Output:</strong> 3
<strong>Explanation:</strong> Because the 4<sup>th</sup> row is incomplete, we return 3.
</pre>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>
<ul>
<li><code>1 &lt;= n &lt;= 2<sup>31</sup> - 1</code></li>
</ul>