leetcode-problemset/leetcode/originData/divide-array-into-equal-pairs.json

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            "title": "Divide Array Into Equal Pairs",
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            "content": "<p>You are given an integer array <code>nums</code> consisting of <code>2 * n</code> integers.</p>\n\n<p>You need to divide <code>nums</code> into <code>n</code> pairs such that:</p>\n\n<ul>\n\t<li>Each element belongs to <strong>exactly one</strong> pair.</li>\n\t<li>The elements present in a pair are <strong>equal</strong>.</li>\n</ul>\n\n<p>Return <code>true</code> <em>if nums can be divided into</em> <code>n</code> <em>pairs, otherwise return</em> <code>false</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [3,2,3,2,2,2]\n<strong>Output:</strong> true\n<strong>Explanation:</strong> \nThere are 6 elements in nums, so they should be divided into 6 / 2 = 3 pairs.\nIf nums is divided into the pairs (2, 2), (3, 3), and (2, 2), it will satisfy all the conditions.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [1,2,3,4]\n<strong>Output:</strong> false\n<strong>Explanation:</strong> \nThere is no way to divide nums into 4 / 2 = 2 pairs such that the pairs satisfy every condition.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>nums.length == 2 * n</code></li>\n\t<li><code>1 &lt;= n &lt;= 500</code></li>\n\t<li><code>1 &lt;= nums[i] &lt;= 500</code></li>\n</ul>\n",
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                "For any number x in the range [1, 500], count the number of elements in nums whose values are equal to x.",
                "The elements with equal value can be divided completely into pairs if and only if their count is even."
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