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leetcode-problemset/leetcode-cn/problem (Chinese)/最长连续序列 [longest-consecutive-sequence].html
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<p>给定一个未排序的整数数组 <code>nums</code> ,找出数字连续的最长序列(不要求序列元素在原数组中连续)的长度。</p>
<p>请你设计并实现时间复杂度为 <code>O(n)</code><em> </em>的算法解决此问题。</p>
<p> </p>
<p><strong>示例 1</strong></p>
<pre>
<strong>输入:</strong>nums = [100,4,200,1,3,2]
<strong>输出:</strong>4
<strong>解释:</strong>最长数字连续序列是 <code>[1, 2, 3, 4]。它的长度为 4。</code></pre>
<p><strong>示例 2</strong></p>
<pre>
<strong>输入:</strong>nums = [0,3,7,2,5,8,4,6,0,1]
<strong>输出:</strong>9
</pre>
<p> </p>
<p><strong>提示:</strong></p>
<ul>
<li><code>0 <= nums.length <= 10<sup>5</sup></code></li>
<li><code>-10<sup>9</sup> <= nums[i] <= 10<sup>9</sup></code></li>
</ul>