leetcode-problemset/leetcode-cn/originData/least-number-of-unique-integers-after-k-removals.json

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            "title": "Least Number of Unique Integers after K Removals",
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            "content": "<p>Given an array of integers&nbsp;<code>arr</code>&nbsp;and an integer <code>k</code>.&nbsp;Find the <em>least number of unique integers</em>&nbsp;after removing <strong>exactly</strong> <code>k</code> elements<b>.</b></p>\r\n\r\n<ol>\r\n</ol>\r\n\r\n<p>&nbsp;</p>\r\n<p><strong class=\"example\">Example 1:</strong></p>\r\n\r\n<pre>\r\n<strong>Input: </strong>arr = [5,5,4], k = 1\r\n<strong>Output: </strong>1\r\n<strong>Explanation</strong>: Remove the single 4, only 5 is left.\r\n</pre>\r\n<strong class=\"example\">Example 2:</strong>\r\n\r\n<pre>\r\n<strong>Input: </strong>arr = [4,3,1,1,3,3,2], k = 3\r\n<strong>Output: </strong>2\r\n<strong>Explanation</strong>: Remove 4, 2 and either one of the two 1s or three 3s. 1 and 3 will be left.</pre>\r\n\r\n<p>&nbsp;</p>\r\n<p><strong>Constraints:</strong></p>\r\n\r\n<ul>\r\n\t<li><code>1 &lt;= arr.length&nbsp;&lt;= 10^5</code></li>\r\n\t<li><code>1 &lt;= arr[i] &lt;= 10^9</code></li>\r\n\t<li><code>0 &lt;= k&nbsp;&lt;= arr.length</code></li>\r\n</ul>",
            "translatedTitle": "不同整数的最少数目",
            "translatedContent": "<p>给你一个整数数组 <code>arr</code> 和一个整数 <code>k</code> 。现需要从数组中恰好移除 <code>k</code> 个元素，请找出移除后数组中不同整数的最少数目。</p>\n\n<ol>\n</ol>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre><strong>输入：</strong>arr = [5,5,4], k = 1\n<strong>输出：</strong>1\n<strong>解释：</strong>移除 1 个 4 ，数组中只剩下 5 一种整数。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre><strong>输入：</strong>arr = [4,3,1,1,3,3,2], k = 3\n<strong>输出：</strong>2\n<strong>解释：</strong>先移除 4、2 ，然后再移除两个 1 中的任意 1 个或者三个 3 中的任意 1 个，最后剩下 1 和 3 两种整数。</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;= 10^5</code></li>\n\t<li><code>1 &lt;= arr[i] &lt;= 10^9</code></li>\n\t<li><code>0 &lt;= k&nbsp;&lt;= arr.length</code></li>\n</ul>\n",
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                "Use a map to count the frequencies of the numbers in the array.",
                "An optimal strategy is to remove the numbers with the smallest count first."
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