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            "title": "Find All Numbers Disappeared in an Array",
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            "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",
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                    "code": "class Solution {\npublic:\n    vector<int> findDisappearedNumbers(vector<int>& nums) {\n        \n    }\n};",
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                    "code": "class Solution {\n    public List<Integer> findDisappearedNumbers(int[] nums) {\n        \n    }\n}",
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                    "code": "class Solution(object):\n    def findDisappearedNumbers(self, nums):\n        \"\"\"\n        :type nums: List[int]\n        :rtype: List[int]\n        \"\"\"\n        ",
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                    "lang": "C",
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                    "code": "\n\n/**\n * Note: The returned array must be malloced, assume caller calls free().\n */\nint* findDisappearedNumbers(int* nums, int numsSize, int* returnSize){\n\n}",
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                    "code": "public class Solution {\n    public IList<int> FindDisappearedNumbers(int[] nums) {\n        \n    }\n}",
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                    "code": "/**\n * @param {number[]} nums\n * @return {number[]}\n */\nvar findDisappearedNumbers = function(nums) {\n    \n};",
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                    "code": "# @param {Integer[]} nums\n# @return {Integer[]}\ndef find_disappeared_numbers(nums)\n    \nend",
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                    "code": "class Solution {\n    func findDisappearedNumbers(_ nums: [Int]) -> [Int] {\n        \n    }\n}",
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                    "code": "object Solution {\n    def findDisappearedNumbers(nums: Array[Int]): List[Int] = {\n        \n    }\n}",
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                    "code": "class Solution {\n    fun findDisappearedNumbers(nums: IntArray): List<Int> {\n        \n    }\n}",
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                    "lang": "Rust",
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                    "code": "impl Solution {\n    pub fn find_disappeared_numbers(nums: Vec<i32>) -> Vec<i32> {\n        \n    }\n}",
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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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