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D0F0SV.json
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{
"data": {
"question": {
"questionId": "1000290",
"questionFrontendId": "剑指 Offer II 104",
"categoryTitle": "LCOF2",
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"title": "排列的数目",
"titleSlug": "D0F0SV",
"content": "<p>English description is not available for the problem. Please switch to Chinese.</p>\n",
"translatedTitle": "排列的数目",
"translatedContent": "<p>给定一个由 <strong>不同</strong> 正整数组成的数组 <code>nums</code> ，和一个目标整数 <code>target</code> 。请从 <code>nums</code> 中找出并返回总和为 <code>target</code> 的元素组合的个数。数组中的数字可以在一次排列中出现任意次，但是顺序不同的序列被视作不同的组合。</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\n<p> </p>\n\n<p><meta charset=\"UTF-8\" />注意：本题与主站 377 题相同：<a href=\"https://leetcode-cn.com/problems/combination-sum-iv/\">https://leetcode-cn.com/problems/combination-sum-iv/</a></p>\n",
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