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"translatedContent": "<p>给你一个整数数组 <code>nums</code> 。</p>\n\n<p>如果一组数字 <code>(i,j)</code> 满足 <code>nums[i]</code> == <code>nums[j]</code> 且 <code>i</code> &lt; <code>j</code> ,就可以认为这是一组 <strong>好数对</strong> 。</p>\n\n<p>返回好数对的数目。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1</strong></p>\n\n<pre><strong>输入:</strong>nums = [1,2,3,1,1,3]\n<strong>输出:</strong>4\n<strong>解释:</strong>有 4 组好数对,分别是 (0,3), (0,4), (3,4), (2,5) ,下标从 0 开始\n</pre>\n\n<p><strong>示例 2</strong></p>\n\n<pre><strong>输入:</strong>nums = [1,1,1,1]\n<strong>输出:</strong>6\n<strong>解释:</strong>数组中的每组数字都是好数对</pre>\n\n<p><strong>示例 3</strong></p>\n\n<pre><strong>输入:</strong>nums = [1,2,3]\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;= nums.length &lt;= 100</code></li>\n\t<li><code>1 &lt;= nums[i] &lt;= 100</code></li>\n</ul>\n",
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"difficulty": "Easy",
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"hints": [
"Count how many times each number appears. If a number appears n times, then n * (n 1) // 2 good pairs can be made with this number."
],