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"questionId": "77",
"questionFrontendId": "77",
"categoryTitle": "Algorithms",
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"title": "Combinations",
"titleSlug": "combinations",
"content": "<p>Given two integers <code>n</code> and <code>k</code>, return <em>all possible combinations of</em> <code>k</code> <em>numbers out of the range</em> <code>[1, n]</code>.</p>\n\n<p>You may return the answer in <strong>any order</strong>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 4, k = 2\n<strong>Output:</strong>\n[\n [2,4],\n [3,4],\n [2,3],\n [1,2],\n [1,3],\n [1,4],\n]\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 1, k = 1\n<strong>Output:</strong> [[1]]\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= n &lt;= 20</code></li>\n\t<li><code>1 &lt;= k &lt;= n</code></li>\n</ul>\n",
"translatedTitle": "组合",
"translatedContent": "<p>给定两个整数 <code>n</code> 和 <code>k</code>,返回范围 <code>[1, n]</code> 中所有可能的 <code>k</code> 个数的组合。</p>\n\n<p>你可以按 <strong>任何顺序</strong> 返回答案。</p>\n\n<p> </p>\n\n<p><strong>示例 1</strong></p>\n\n<pre>\n<strong>输入:</strong>n = 4, k = 2\n<strong>输出:</strong>\n[\n [2,4],\n [3,4],\n [2,3],\n [1,2],\n [1,3],\n [1,4],\n]</pre>\n\n<p><strong>示例 2</strong></p>\n\n<pre>\n<strong>输入:</strong>n = 1, k = 1\n<strong>输出:</strong>[[1]]</pre>\n\n<p> </p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>1 <= n <= 20</code></li>\n\t<li><code>1 <= k <= n</code></li>\n</ul>\n",
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"code": "class Solution(object):\n def combine(self, n, k):\n \"\"\"\n :type n: int\n :type k: int\n :rtype: List[List[int]]\n \"\"\"",
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"code": "\n\n/**\n * Return an array of arrays of size *returnSize.\n * The sizes of the arrays are returned as *returnColumnSizes array.\n * Note: Both returned array and *columnSizes array must be malloced, assume caller calls free().\n */\nint** combine(int n, int k, int* returnSize, int** returnColumnSizes){\n\n}",
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