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            "title": "Combination Sum IV",
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            "content": "<p>Given an array of <strong>distinct</strong> integers <code>nums</code> and a target integer <code>target</code>, return <em>the number of possible combinations that add up to</em>&nbsp;<code>target</code>.</p>\n\n<p>The test cases are generated so that the answer can fit in a <strong>32-bit</strong> integer.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [1,2,3], target = 4\n<strong>Output:</strong> 7\n<strong>Explanation:</strong>\nThe possible combination ways are:\n(1, 1, 1, 1)\n(1, 1, 2)\n(1, 2, 1)\n(1, 3)\n(2, 1, 1)\n(2, 2)\n(3, 1)\nNote that different sequences are counted as different combinations.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [9], target = 3\n<strong>Output:</strong> 0\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= nums.length &lt;= 200</code></li>\n\t<li><code>1 &lt;= nums[i] &lt;= 1000</code></li>\n\t<li>All the elements of <code>nums</code> are <strong>unique</strong>.</li>\n\t<li><code>1 &lt;= target &lt;= 1000</code></li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong>Follow up:</strong> What if negative numbers are allowed in the given array? How does it change the problem? What limitation we need to add to the question to allow negative numbers?</p>\n",
            "translatedTitle": "组合总和 Ⅳ",
            "translatedContent": "<p>给你一个由 <strong>不同</strong> 整数组成的数组 <code>nums</code> ，和一个目标整数 <code>target</code> 。请你从 <code>nums</code> 中找出并返回总和为 <code>target</code> 的元素组合的个数。</p>\n\n<p>题目数据保证答案符合 32 位整数范围。</p>\n\n<p> </p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>nums = [1,2,3], target = 4\n<strong>输出：</strong>7\n<strong>解释：</strong>\n所有可能的组合为：\n(1, 1, 1, 1)\n(1, 1, 2)\n(1, 2, 1)\n(1, 3)\n(2, 1, 1)\n(2, 2)\n(3, 1)\n请注意，顺序不同的序列被视作不同的组合。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>nums = [9], target = 3\n<strong>输出：</strong>0\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 <= nums.length <= 200</code></li>\n\t<li><code>1 <= nums[i] <= 1000</code></li>\n\t<li><code>nums</code> 中的所有元素 <strong>互不相同</strong></li>\n\t<li><code>1 <= target <= 1000</code></li>\n</ul>\n\n<p> </p>\n\n<p><strong>进阶：</strong>如果给定的数组中含有负数会发生什么？问题会产生何种变化？如果允许负数出现，需要向题目中添加哪些限制条件？</p>\n",
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