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51 lines
2.1 KiB
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<p>给定两个由一些<strong> 闭区间 </strong>组成的列表，<code>firstList</code> 和 <code>secondList</code> ，其中 <code>firstList[i] = [start<sub>i</sub>, end<sub>i</sub>]</code> 而 <code>secondList[j] = [start<sub>j</sub>, end<sub>j</sub>]</code> 。每个区间列表都是成对 <strong>不相交</strong> 的，并且 <strong>已经排序</strong> 。</p>
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<p>返回这 <strong>两个区间列表的交集</strong> 。</p>
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<p>形式上，<strong>闭区间</strong> <code>[a, b]</code>（其中 <code>a <= b</code>）表示实数 <code>x</code> 的集合，而 <code>a <= x <= b</code> 。</p>
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<p>两个闭区间的 <strong>交集</strong> 是一组实数，要么为空集，要么为闭区间。例如，<code>[1, 3]</code> 和 <code>[2, 4]</code> 的交集为 <code>[2, 3]</code> 。</p>
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<p> </p>
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<p><strong>示例 1：</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2019/01/30/interval1.png" style="width: 700px; height: 194px;" />
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<pre>
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<strong>输入：</strong>firstList = [[0,2],[5,10],[13,23],[24,25]], secondList = [[1,5],[8,12],[15,24],[25,26]]
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<strong>输出：</strong>[[1,2],[5,5],[8,10],[15,23],[24,24],[25,25]]
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</pre>
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<p><strong>示例 2：</strong></p>
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<pre>
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<strong>输入：</strong>firstList = [[1,3],[5,9]], secondList = []
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<strong>输出：</strong>[]
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</pre>
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<p><strong>示例 3：</strong></p>
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<pre>
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<strong>输入：</strong>firstList = [], secondList = [[4,8],[10,12]]
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<strong>输出：</strong>[]
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</pre>
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<p><strong>示例 4：</strong></p>
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<pre>
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<strong>输入：</strong>firstList = [[1,7]], secondList = [[3,10]]
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<strong>输出：</strong>[[3,7]]
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</pre>
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<p> </p>
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<p><strong>提示：</strong></p>
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<ul>
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<li><code>0 <= firstList.length, secondList.length <= 1000</code></li>
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<li><code>firstList.length + secondList.length >= 1</code></li>
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<li><code>0 <= start<sub>i</sub> < end<sub>i</sub> <= 10<sup>9</sup></code></li>
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<li><code>end<sub>i</sub> < start<sub>i+1</sub></code></li>
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<li><code>0 <= start<sub>j</sub> < end<sub>j</sub> <= 10<sup>9</sup> </code></li>
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<li><code>end<sub>j</sub> < start<sub>j+1</sub></code></li>
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</ul>
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