leetcode-problemset/leetcode-cn/originData/find-all-numbers-disappeared-in-an-array.json

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        "question": {
            "questionId": "448",
            "questionFrontendId": "448",
            "categoryTitle": "Algorithms",
            "boundTopicId": 1563,
            "title": "Find All Numbers Disappeared in an Array",
            "titleSlug": "find-all-numbers-disappeared-in-an-array",
            "content": "<p>Given an array <code>nums</code> of <code>n</code> integers where <code>nums[i]</code> is in the range <code>[1, n]</code>, return <em>an array of all the integers in the range</em> <code>[1, n]</code> <em>that do not appear in</em> <code>nums</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n<pre><strong>Input:</strong> nums = [4,3,2,7,8,2,3,1]\n<strong>Output:</strong> [5,6]\n</pre><p><strong>Example 2:</strong></p>\n<pre><strong>Input:</strong> nums = [1,1]\n<strong>Output:</strong> [2]\n</pre>\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>n == nums.length</code></li>\n\t<li><code>1 &lt;= n &lt;= 10<sup>5</sup></code></li>\n\t<li><code>1 &lt;= nums[i] &lt;= n</code></li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong>Follow up:</strong> Could you do it without extra space and in <code>O(n)</code> runtime? You may assume the returned list does not count as extra space.</p>\n",
            "translatedTitle": "找到所有数组中消失的数字",
            "translatedContent": "<p>给你一个含 <code>n</code> 个整数的数组 <code>nums</code> ，其中 <code>nums[i]</code> 在区间 <code>[1, n]</code> 内。请你找出所有在 <code>[1, n]</code> 范围内但没有出现在 <code>nums</code> 中的数字，并以数组的形式返回结果。</p>\n\n<p> </p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>nums = [4,3,2,7,8,2,3,1]\n<strong>输出：</strong>[5,6]\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>nums = [1,1]\n<strong>输出：</strong>[2]\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>n == nums.length</code></li>\n\t<li><code>1 <= n <= 10<sup>5</sup></code></li>\n\t<li><code>1 <= nums[i] <= n</code></li>\n</ul>\n\n<p><strong>进阶：</strong>你能在不使用额外空间且时间复杂度为<em> </em><code>O(n)</code><em> </em>的情况下解决这个问题吗? 你可以假定返回的数组不算在额外空间内。</p>\n",
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            "difficulty": "Easy",
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            "hints": [
                "This is a really easy problem if you decide to use additional memory. For those trying to write an initial solution using additional memory, think <b>counters!</b>",
                "However, the trick really is to not use any additional space than what is already available to use. Sometimes, multiple passes over the input array help find the solution. However, there's an interesting piece of information in this problem that makes it easy to re-use the input array itself for the solution.",
                "The problem specifies that the numbers in the array will be in the range [1, n] where n is the number of elements in the array. Can we use this information and modify the array in-place somehow to find what we need?"
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