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leetcode-cn/problem (English)/数组中重复的数据(English) [find-all-duplicates-in-an-array].html
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<p>Given an integer array <code>nums</code> of length <code>n</code> where all the integers of <code>nums</code> are in the range <code>[1, n]</code> and each integer appears <strong>once</strong> or <strong>twice</strong>, return <em>an array of all the integers that appears <strong>twice</strong></em>.</p>
<p>Given an integer array <code>nums</code> of length <code>n</code> where all the integers of <code>nums</code> are in the range <code>[1, n]</code> and each integer appears <strong>at most</strong> <strong>twice</strong>, return <em>an array of all the integers that appears <strong>twice</strong></em>.</p>
<p>You must write an algorithm that runs in&nbsp;<code>O(n)&nbsp;</code>time and uses only constant extra space.</p>
<p>You must write an algorithm that runs in <code>O(n)</code> time and uses only <em>constant</em> auxiliary space, excluding the space needed to store the output</p>
<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>