Project Notes

Factorial Trailing Zeroes

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Description

tab: English
 
<p>Given an integer <code>n</code>, return <em>the number of trailing zeroes in </em><code>n!</code>.</p>
 
<p>Note that <code>n! = n * (n - 1) * (n - 2) * ... * 3 * 2 * 1</code>.</p>
 
<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
 
<pre>
<strong>Input:</strong> n = 3
<strong>Output:</strong> 0
<strong>Explanation:</strong> 3! = 6, no trailing zero.
</pre>
 
<p><strong class="example">Example 2:</strong></p>
 
<pre>
<strong>Input:</strong> n = 5
<strong>Output:</strong> 1
<strong>Explanation:</strong> 5! = 120, one trailing zero.
</pre>
 
<p><strong class="example">Example 3:</strong></p>
 
<pre>
<strong>Input:</strong> n = 0
<strong>Output:</strong> 0
</pre>
 
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>
 
<ul>
	<li><code>0 &lt;= n &lt;= 10<sup>4</sup></code></li>
</ul>
 
<p>&nbsp;</p>
<p><strong>Follow up:</strong> Could you write a solution that works in logarithmic time complexity?</p>
 
 
 
---
 
[submissions](https://leetcode.com/problems/factorial-trailing-zeroes/submissions/) | [solutions](https://leetcode.com/problems/factorial-trailing-zeroes/solutions/)
 
 
tab: 中文
 
<p>给定一个整数 <code>n</code> ，返回 <code>n!</code> 结果中尾随零的数量。</p>
 
<p>提示&nbsp;<code>n! = n * (n - 1) * (n - 2) * ... * 3 * 2 * 1</code></p>
 
<p>&nbsp;</p>
 
<p><strong>示例 1：</strong></p>
 
<pre>
<strong>输入：</strong>n = 3
<strong>输出：</strong>0
<strong>解释：</strong>3! = 6 ，不含尾随 0
</pre>
 
<p><strong>示例 2：</strong></p>
 
<pre>
<strong>输入：</strong>n = 5
<strong>输出：</strong>1
<strong>解释：</strong>5! = 120 ，有一个尾随 0
</pre>
 
<p><strong>示例 3：</strong></p>
 
<pre>
<strong>输入：</strong>n = 0
<strong>输出：</strong>0
</pre>
 
<p>&nbsp;</p>
 
<p><strong>提示：</strong></p>
 
<ul>
	<li><code>0 &lt;= n &lt;= 10<sup>4</sup></code></li>
</ul>
 
<p>&nbsp;</p>
 
<p><b>进阶：</b>你可以设计并实现对数时间复杂度的算法来解决此问题吗？</p>
 
 
 
---
 
[提交记录](https://leetcode.cn/problems/factorial-trailing-zeroes/submissions/) | [题解](https://leetcode.cn/problems/factorial-trailing-zeroes/solution/)

Solutions & Notes

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