leetcode-problemset/leetcode-cn/originData/unique-number-of-occurrences.json

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        "question": {
            "questionId": "1319",
            "questionFrontendId": "1207",
            "categoryTitle": "Algorithms",
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            "title": "Unique Number of Occurrences",
            "titleSlug": "unique-number-of-occurrences",
            "content": "<p>Given an array of integers <code>arr</code>, return <code>true</code> <em>if the number of occurrences of each value in the array is <strong>unique</strong> or </em><code>false</code><em> otherwise</em>.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [1,2,2,1,1,3]\n<strong>Output:</strong> true\n<strong>Explanation:</strong>&nbsp;The value 1 has 3 occurrences, 2 has 2 and 3 has 1. No two values have the same number of occurrences.</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [1,2]\n<strong>Output:</strong> false\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [-3,0,1,-3,1,1,1,-3,10,0]\n<strong>Output:</strong> true\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;= 1000</code></li>\n\t<li><code>-1000 &lt;= arr[i] &lt;= 1000</code></li>\n</ul>\n",
            "translatedTitle": "独一无二的出现次数",
            "translatedContent": "<p>给你一个整数数组&nbsp;<code>arr</code>，请你帮忙统计数组中每个数的出现次数。</p>\n\n<p>如果每个数的出现次数都是独一无二的，就返回&nbsp;<code>true</code>；否则返回 <code>false</code>。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre><strong>输入：</strong>arr = [1,2,2,1,1,3]\n<strong>输出：</strong>true\n<strong>解释：</strong>在该数组中，1 出现了 3 次，2 出现了 2 次，3 只出现了 1 次。没有两个数的出现次数相同。</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre><strong>输入：</strong>arr = [1,2]\n<strong>输出：</strong>false\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre><strong>输入：</strong>arr = [-3,0,1,-3,1,1,1,-3,10,0]\n<strong>输出：</strong>true\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&nbsp;&lt;= 1000</code></li>\n\t<li><code>-1000 &lt;= arr[i] &lt;= 1000</code></li>\n</ul>\n",
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                "Find the number of occurrences of each element in the array using a hash map.",
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