counting-words-with-a-given-prefix

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Algorithms

You are given an array of strings <code>words</code> and a string <code>pref</code>.

Return the number of strings in <code>words</code> that contain <code>pref</code> as a prefix.

A prefix of a string <code>s</code> is any leading contiguous substring of <code>s</code>.

&nbsp;
Example 1:

<pre>
Input: words = [&quot;pay&quot;,&quot;attention&quot;,&quot;practice&quot;,&quot;attend&quot;], <code>pref </code>= &quot;at&quot;
Output: 2
Explanation: The 2 strings that contain &quot;at&quot; as a prefix are: &quot;attention&quot; and &quot;attend&quot;.
</pre>

Example 2:

<pre>
Input: words = [&quot;leetcode&quot;,&quot;win&quot;,&quot;loops&quot;,&quot;success&quot;], <code>pref </code>= &quot;code&quot;
Output: 0
Explanation: There are no strings that contain &quot;code&quot; as a prefix.
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= words.length &lt;= 100</code></li>
	<li><code>1 &lt;= words[i].length, pref.length &lt;= 100</code></li>
	<li><code>words[i]</code> and <code>pref</code> consist of lowercase English letters.</li>
</ul>

prefixCount

Counting Words With a Given Prefix

Check If a Word Occurs As a Prefix of Any Word in a Sentence

check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence

检查单词是否为句中其他单词的前缀

Count Prefixes of a Given String

count-prefixes-of-a-given-string

统计是给定字符串前缀的字符串数目

Array

String

String Matching

给你一个字符串数组 <code>words</code> 和一个字符串 <code>pref</code> 。

返回 <code>words</code> 中以 <code>pref</code> 作为 前缀 的字符串的数目。

字符串 <code>s</code> 的 前缀 就是&nbsp; <code>s</code> 的任一前导连续字符串。

&nbsp;

示例 1：

<pre>输入：words = ["pay","attention","practice","attend"], <code>pref </code>= "at"
输出：2
解释：以 "at" 作为前缀的字符串有两个，分别是："attention" 和 "attend" 。
</pre>

示例 2：

<pre>输入：words = ["leetcode","win","loops","success"], <code>pref </code>= "code"
输出：0
解释：不存在以 "code" 作为前缀的字符串。
</pre>

&nbsp;

提示：

<ul>
	<li><code>1 &lt;= words.length &lt;= 100</code></li>
	<li><code>1 &lt;= words[i].length, pref.length &lt;= 100</code></li>
	<li><code>words[i]</code> 和 <code>pref</code> 由小写英文字母组成</li>
</ul>