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leetcode-problemset/leetcode-cn/problem (Chinese)/统计是给定字符串前缀的字符串数目 [count-prefixes-of-a-given-string].html

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2022-05-02 23:41:28 +08:00
<p>给你一个字符串数组&nbsp;<code>words</code>&nbsp;和一个字符串&nbsp;<code>s</code>&nbsp;,其中&nbsp;<code>words[i]</code>&nbsp;<code>s</code>&nbsp;只包含 <strong>小写英文字母</strong>&nbsp;</p>
<p>请你返回 <code>words</code>&nbsp;中是字符串 <code>s</code>&nbsp;<strong>前缀&nbsp;</strong><strong>字符串数目</strong>&nbsp;</p>
<p>一个字符串的 <strong>前缀</strong>&nbsp;是出现在字符串开头的子字符串。<strong>子字符串</strong>&nbsp;是一个字符串中的连续一段字符序列。</p>
<p>&nbsp;</p>
<p><strong>示例 1</strong></p>
<pre><b>输入:</b>words = ["a","b","c","ab","bc","abc"], s = "abc"
<b>输出:</b>3
<strong>解释:</strong>
words 中是 s = "abc" 前缀的字符串为:
"a" "ab" 和 "abc" 。
所以 words 中是字符串 s 前缀的字符串数目为 3 。</pre>
<p><strong>示例 2</strong></p>
<pre><b>输入:</b>words = ["a","a"], s = "aa"
<b>输出:</b>2
<strong>解释:
</strong>两个字符串都是 s 的前缀。
注意,相同的字符串可能在 words 中出现多次,它们应该被计数多次。</pre>
<p>&nbsp;</p>
<p><strong>提示:</strong></p>
<ul>
<li><code>1 &lt;= words.length &lt;= 1000</code></li>
<li><code>1 &lt;= words[i].length, s.length &lt;= 10</code></li>
<li><code>words[i]</code>&nbsp;<code>s</code>&nbsp;<strong></strong>&nbsp;包含小写英文字母。</li>
</ul>