mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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186 lines
16 KiB
JSON
186 lines
16 KiB
JSON
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"questionId": "2308",
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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> </p>\n<p><strong class=\"example\">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 class=\"example\">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> </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 <= n <= 500</code></li>\n\t<li><code>1 <= nums[i] <= 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.",
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"The elements with equal value can be divided completely into pairs if and only if their count is even."
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