leetcode-problemset/leetcode-cn/originData/minimum-number-of-operations-to-make-array-empty.json

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            "title": "Minimum Number of Operations to Make Array Empty",
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            "content": "<p>You are given a <strong>0-indexed</strong> array <code>nums</code> consisting of positive integers.</p>\n\n<p>There are two types of operations that you can apply on the array <strong>any</strong> number of times:</p>\n\n<ul>\n\t<li>Choose <strong>two</strong> elements with <strong>equal</strong> values and <strong>delete</strong> them from the array.</li>\n\t<li>Choose <strong>three</strong> elements with <strong>equal</strong> values and <strong>delete</strong> them from the array.</li>\n</ul>\n\n<p>Return <em>the <strong>minimum</strong> number of operations required to make the array empty, or </em><code>-1</code><em> if it is not possible</em>.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [2,3,3,2,2,4,2,3,4]\n<strong>Output:</strong> 4\n<strong>Explanation:</strong> We can apply the following operations to make the array empty:\n- Apply the first operation on the elements at indices 0 and 3. The resulting array is nums = [3,3,2,4,2,3,4].\n- Apply the first operation on the elements at indices 2 and 4. The resulting array is nums = [3,3,4,3,4].\n- Apply the second operation on the elements at indices 0, 1, and 3. The resulting array is nums = [4,4].\n- Apply the first operation on the elements at indices 0 and 1. The resulting array is nums = [].\nIt can be shown that we cannot make the array empty in less than 4 operations.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [2,1,2,2,3,3]\n<strong>Output:</strong> -1\n<strong>Explanation:</strong> It is impossible to empty the array.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>2 &lt;= nums.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>1 &lt;= nums[i] &lt;= 10<sup>6</sup></code></li>\n</ul>\n",
            "translatedTitle": "使数组为空的最少操作次数",
            "translatedContent": "<p>给你一个下标从 <strong>0</strong>&nbsp;开始的正整数数组&nbsp;<code>nums</code>&nbsp;。</p>\n\n<p>你可以对数组执行以下两种操作 <strong>任意次</strong>&nbsp;：</p>\n\n<ul>\n\t<li>从数组中选择 <strong>两个</strong>&nbsp;值 <strong>相等</strong>&nbsp;的元素，并将它们从数组中 <strong>删除</strong>&nbsp;。</li>\n\t<li>从数组中选择 <strong>三个</strong>&nbsp;值 <strong>相等</strong>&nbsp;的元素，并将它们从数组中 <strong>删除</strong>&nbsp;。</li>\n</ul>\n\n<p>请你返回使数组为空的 <strong>最少</strong>&nbsp;操作次数，如果无法达成，请返回 <code>-1</code>&nbsp;。</p>\n\n<p>&nbsp;</p>\n\n<p><strong class=\"example\">示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>nums = [2,3,3,2,2,4,2,3,4]\n<b>输出：</b>4\n<b>解释：</b>我们可以执行以下操作使数组为空：\n- 对下标为 0 和 3 的元素执行第一种操作，得到 nums = [3,3,2,4,2,3,4] 。\n- 对下标为 2 和 4 的元素执行第一种操作，得到 nums = [3,3,4,3,4] 。\n- 对下标为 0 ，1 和 3 的元素执行第二种操作，得到 nums = [4,4] 。\n- 对下标为 0 和 1 的元素执行第一种操作，得到 nums = [] 。\n至少需要 4 步操作使数组为空。\n</pre>\n\n<p><strong class=\"example\">示例 2：</strong></p>\n\n<pre>\n<b>输入：</b>nums = [2,1,2,2,3,3]\n<b>输出：</b>-1\n<b>解释：</b>无法使数组为空。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>2 &lt;= nums.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>1 &lt;= nums[i] &lt;= 10<sup>6</sup></code></li>\n</ul>\n",
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