leetcode-problemset/leetcode-cn/originData/set-intersection-size-at-least-two.json

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            "title": "Set Intersection Size At Least Two",
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            "content": "<p>An integer interval <code>[a, b]</code> (for integers <code>a &lt; b</code>) is a set of all consecutive integers from <code>a</code> to <code>b</code>, including <code>a</code> and <code>b</code>.</p>\n\n<p>Find the minimum size of a set S such that for every integer interval A in <code>intervals</code>, the intersection of S with A has a size of at least two.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> intervals = [[1,3],[1,4],[2,5],[3,5]]\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> Consider the set S = {2, 3, 4}.  For each interval, there are at least 2 elements from S in the interval.\nAlso, there isn&#39;t a smaller size set that fulfills the above condition.\nThus, we output the size of this set, which is 3.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> intervals = [[1,2],[2,3],[2,4],[4,5]]\n<strong>Output:</strong> 5\n<strong>Explanation:</strong> An example of a minimum sized set is {1, 2, 3, 4, 5}.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= intervals.length &lt;= 3000</code></li>\n\t<li><code>intervals[i].length == 2</code></li>\n\t<li><code>0 &lt;= a<sub>i</sub> &lt;&nbsp;b<sub>i</sub> &lt;= 10<sup>8</sup></code></li>\n</ul>\n",
            "translatedTitle": "设置交集大小至少为2",
            "translatedContent": "<p>一个整数区间&nbsp;<code>[a, b]</code>&nbsp;&nbsp;(&nbsp;<code>a &lt; b</code>&nbsp;) 代表着从&nbsp;<code>a</code>&nbsp;到&nbsp;<code>b</code>&nbsp;的所有连续整数，包括&nbsp;<code>a</code>&nbsp;和&nbsp;<code>b</code>。</p>\n\n<p>给你一组整数区间<code>intervals</code>，请找到一个最小的集合 S，使得 S 里的元素与区间<code>intervals</code>中的每一个整数区间都至少有2个元素相交。</p>\n\n<p>输出这个最小集合S的大小。</p>\n\n<p><strong>示例 1:</strong></p>\n\n<pre><strong>输入:</strong> intervals = [[1, 3], [1, 4], [2, 5], [3, 5]]\n<strong>输出:</strong> 3\n<strong>解释:</strong>\n考虑集合 S = {2, 3, 4}. S与intervals中的四个区间都有至少2个相交的元素。\n且这是S最小的情况，故我们输出3。\n</pre>\n\n<p><strong>示例 2:</strong></p>\n\n<pre><strong>输入:</strong> intervals = [[1, 2], [2, 3], [2, 4], [4, 5]]\n<strong>输出:</strong> 5\n<strong>解释:</strong>\n最小的集合S = {1, 2, 3, 4, 5}.\n</pre>\n\n<p><strong>注意:</strong></p>\n\n<ol>\n\t<li><code>intervals</code>&nbsp;的长度范围为<code>[1, 3000]</code>。</li>\n\t<li><code>intervals[i]</code>&nbsp;长度为&nbsp;<code>2</code>，分别代表左、右边界。</li>\n\t<li><code>intervals[i][j]</code> 的值是&nbsp;<code>[0, 10^8]</code>范围内的整数。</li>\n</ol>\n",
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