leetcode-problemset/leetcode-cn/originData/find-the-index-of-the-first-occurrence-in-a-string.json

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            "title": "Find the Index of the First Occurrence in a String",
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            "content": "<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>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> haystack = &quot;sadbutsad&quot;, needle = &quot;sad&quot;\n<strong>Output:</strong> 0\n<strong>Explanation:</strong> &quot;sad&quot; occurs at index 0 and 6.\nThe first occurrence is at index 0, so we return 0.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> haystack = &quot;leetcode&quot;, needle = &quot;leeto&quot;\n<strong>Output:</strong> -1\n<strong>Explanation:</strong> &quot;leeto&quot; did not occur in &quot;leetcode&quot;, so we return -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": "找出字符串中第一个匹配项的下标",
            "translatedContent": "<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> 字符串的第一个匹配项的下标（下标从 0 开始）。如果&nbsp;<code>needle</code> 不是 <code>haystack</code> 的一部分，则返回&nbsp; <code>-1</code><strong> </strong>。</p>\n\n<p>&nbsp;</p>\n\n<p><strong class=\"example\">示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>haystack = \"sadbutsad\", needle = \"sad\"\n<strong>输出：</strong>0\n<strong>解释：</strong>\"sad\" 在下标 0 和 6 处匹配。\n第一个匹配项的下标是 0 ，所以返回 0 。\n</pre>\n\n<p><strong class=\"example\">示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>haystack = \"leetcode\", needle = \"leeto\"\n<strong>输出：</strong>-1\n<strong>解释：</strong>\"leeto\" 没有在 \"leetcode\" 中出现，所以返回 -1 。\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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