leetcode-problemset/leetcode-cn/originData/find-lucky-integer-in-an-array.json

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        "question": {
            "questionId": "1510",
            "questionFrontendId": "1394",
            "categoryTitle": "Algorithms",
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            "title": "Find Lucky Integer in an Array",
            "titleSlug": "find-lucky-integer-in-an-array",
            "content": "<p>Given an array of integers <code>arr</code>, a <strong>lucky integer</strong> is an integer that has a frequency in the array equal to its value.</p>\n\n<p>Return <em>the largest <strong>lucky integer</strong> in the array</em>. If there is no <strong>lucky integer</strong> return <code>-1</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [2,2,3,4]\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> The only lucky number in the array is 2 because frequency[2] == 2.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [1,2,2,3,3,3]\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> 1, 2 and 3 are all lucky numbers, return the largest of them.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [2,2,2,3,3]\n<strong>Output:</strong> -1\n<strong>Explanation:</strong> There are no lucky numbers in the array.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= arr.length &lt;= 500</code></li>\n\t<li><code>1 &lt;= arr[i] &lt;= 500</code></li>\n</ul>\n",
            "translatedTitle": "找出数组中的幸运数",
            "translatedContent": "<p>在整数数组中，如果一个整数的出现频次和它的数值大小相等，我们就称这个整数为「幸运数」。</p>\n\n<p>给你一个整数数组 <code>arr</code>，请你从中找出并返回一个幸运数。</p>\n\n<ul>\n\t<li>如果数组中存在多个幸运数，只需返回 <strong>最大</strong> 的那个。</li>\n\t<li>如果数组中不含幸运数，则返回 <strong>-1 </strong>。</li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre><strong>输入：</strong>arr = [2,2,3,4]\n<strong>输出：</strong>2\n<strong>解释：</strong>数组中唯一的幸运数是 2 ，因为数值 2 的出现频次也是 2 。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre><strong>输入：</strong>arr = [1,2,2,3,3,3]\n<strong>输出：</strong>3\n<strong>解释：</strong>1、2 以及 3 都是幸运数，只需要返回其中最大的 3 。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre><strong>输入：</strong>arr = [2,2,2,3,3]\n<strong>输出：</strong>-1\n<strong>解释：</strong>数组中不存在幸运数。\n</pre>\n\n<p><strong>示例 4：</strong></p>\n\n<pre><strong>输入：</strong>arr = [5]\n<strong>输出：</strong>-1\n</pre>\n\n<p><strong>示例 5：</strong></p>\n\n<pre><strong>输入：</strong>arr = [7,7,7,7,7,7,7]\n<strong>输出：</strong>7\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= arr.length &lt;= 500</code></li>\n\t<li><code>1 &lt;= arr[i] &lt;= 500</code></li>\n</ul>\n",
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                "Count the frequency of each integer in the array.",
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