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add leetcode problem-cn part6

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2022-03-27 20:56:26 +08:00
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算法题（国内版）/problem (Chinese)/缺失的第一个正数 [first-missing-positive].html Normal file
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<p>给你一个未排序的整数数组 <code>nums</code> ，请你找出其中没有出现的最小的正整数。</p>
请你实现时间复杂度为 <code>O(n)</code> 并且只使用常数级别额外空间的解决方案。
<p> </p>
<p><strong>示例 1：</strong></p>
<pre>
<strong>输入：</strong>nums = [1,2,0]
<strong>输出：</strong>3
</pre>
<p><strong>示例 2：</strong></p>
<pre>
<strong>输入：</strong>nums = [3,4,-1,1]
<strong>输出：</strong>2
</pre>
<p><strong>示例 3：</strong></p>
<pre>
<strong>输入：</strong>nums = [7,8,9,11,12]
<strong>输出：</strong>1
</pre>
<p> </p>
<p><strong>提示：</strong></p>
<ul>
<li><code>1 <= nums.length <= 5 * 10<sup>5</sup></code></li>
<li><code>-2<sup>31</sup> <= nums[i] <= 2<sup>31</sup> - 1</code></li>
</ul>