leetcode-problemset/leetcode-cn/originData/implement-strstr.json

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            "title": "Implement strStr()",
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            "content": "<p>Implement <a href=\"http://www.cplusplus.com/reference/cstring/strstr/\" target=\"_blank\">strStr()</a>.</p>\n\n<p>Given two strings <code>needle</code> and <code>haystack</code>, return the index of the first occurrence of <code>needle</code> in <code>haystack</code>, or <code>-1</code> if <code>needle</code> is not part of <code>haystack</code>.</p>\n\n<p><strong>Clarification:</strong></p>\n\n<p>What should we return when <code>needle</code> is an empty string? This is a great question to ask during an interview.</p>\n\n<p>For the purpose of this problem, we will return 0 when <code>needle</code> is an empty string. This is consistent to C&#39;s <a href=\"http://www.cplusplus.com/reference/cstring/strstr/\" target=\"_blank\">strstr()</a> and Java&#39;s <a href=\"https://docs.oracle.com/javase/7/docs/api/java/lang/String.html#indexOf(java.lang.String)\" target=\"_blank\">indexOf()</a>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> haystack = &quot;hello&quot;, needle = &quot;ll&quot;\n<strong>Output:</strong> 2\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> haystack = &quot;aaaaa&quot;, needle = &quot;bba&quot;\n<strong>Output:</strong> -1\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= haystack.length, needle.length &lt;= 10<sup>4</sup></code></li>\n\t<li><code>haystack</code> and <code>needle</code> consist of only lowercase English characters.</li>\n</ul>\n",
            "translatedTitle": "实现 strStr()",
            "translatedContent": "<p>实现&nbsp;<a href=\"https://baike.baidu.com/item/strstr/811469\" target=\"_blank\">strStr()</a>&nbsp;函数。</p>\n\n<p>给你两个字符串&nbsp;<code>haystack</code> 和 <code>needle</code> ，请你在 <code>haystack</code> 字符串中找出 <code>needle</code> 字符串出现的第一个位置（下标从 0 开始）。如果不存在，则返回&nbsp; <code>-1</code><strong> </strong>。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>说明：</strong></p>\n\n<p>当&nbsp;<code>needle</code>&nbsp;是空字符串时，我们应当返回什么值呢？这是一个在面试中很好的问题。</p>\n\n<p>对于本题而言，当&nbsp;<code>needle</code>&nbsp;是空字符串时我们应当返回 0 。这与 C 语言的&nbsp;<a href=\"https://baike.baidu.com/item/strstr/811469\" target=\"_blank\">strstr()</a>&nbsp;以及 Java 的&nbsp;<a href=\"https://docs.oracle.com/javase/7/docs/api/java/lang/String.html#indexOf(java.lang.String)\" target=\"_blank\">indexOf()</a>&nbsp;定义相符。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>haystack = \"hello\", needle = \"ll\"\n<strong>输出：</strong>2\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>haystack = \"aaaaa\", needle = \"bba\"\n<strong>输出：</strong>-1\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>haystack = \"\", needle = \"\"\n<strong>输出：</strong>0\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= haystack.length, needle.length &lt;= 10<sup>4</sup></code></li>\n\t<li><code>haystack</code> 和 <code>needle</code> 仅由小写英文字符组成</li>\n</ul>\n",
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