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"translatedContent": "<p>给定一个包含 <code>n + 1</code> 个整数的数组 <code>nums</code> ,其数字都在 <code>[1, n]</code> 范围内(包括 <code>1</code> 和 <code>n</code>),可知至少存在一个重复的整数。</p>\n\n<p>假设 <code>nums</code> 只有 <strong>一个重复的整数</strong> ,返回 <strong>这个重复的数</strong> 。</p>\n\n<p>你设计的解决方案必须 <strong>不修改</strong> 数组 <code>nums</code> 且只用常量级 <code>O(1)</code> 的额外空间。</p>\n\n<p> </p>\n\n<p><strong>示例 1:</strong></p>\n\n<pre>\n<strong>输入:</strong>nums = [1,3,4,2,2]\n<strong>输出:</strong>2\n</pre>\n\n<p><strong>示例 2:</strong></p>\n\n<pre>\n<strong>输入:</strong>nums = [3,1,3,4,2]\n<strong>输出:</strong>3\n</pre>\n\n<p> </p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>1 <= n <= 10<sup>5</sup></code></li>\n\t<li><code>nums.length == n + 1</code></li>\n\t<li><code>1 <= nums[i] <= n</code></li>\n\t<li><code>nums</code> 中 <strong>只有一个整数</strong> 出现 <strong>两次或多次</strong> ,其余整数均只出现 <strong>一次</strong></li>\n</ul>\n\n<p> </p>\n\n<p><b>进阶:</b></p>\n\n<ul>\n\t<li>如何证明 <code>nums</code> 中至少存在一个重复的数字?</li>\n\t<li>你可以设计一个线性级时间复杂度 <code>O(n)</code> 的解决方案吗?</li>\n</ul>\n",
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