{ "data": { "question": { "questionId": "377", "questionFrontendId": "377", "categoryTitle": "Algorithms", "boundTopicId": 1172, "title": "Combination Sum IV", "titleSlug": "combination-sum-iv", "content": "

Given an array of distinct integers nums and a target integer target, return the number of possible combinations that add up to target.

\n\n

The test cases are generated so that the answer can fit in a 32-bit integer.

\n\n

 

\n

Example 1:

\n\n
\nInput: nums = [1,2,3], target = 4\nOutput: 7\nExplanation:\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
\n\n

Example 2:

\n\n
\nInput: nums = [9], target = 3\nOutput: 0\n
\n\n

 

\n

Constraints:

\n\n\n\n

 

\n

Follow up: 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?

\n", "translatedTitle": "组合总和 Ⅳ", "translatedContent": "

给你一个由 不同 整数组成的数组 nums ,和一个目标整数 target 。请你从 nums 中找出并返回总和为 target 的元素组合的个数。

\n\n

题目数据保证答案符合 32 位整数范围。

\n\n

 

\n\n

示例 1:

\n\n
\n输入:nums = [1,2,3], target = 4\n输出:7\n解释:\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
\n\n

示例 2:

\n\n
\n输入:nums = [9], target = 3\n输出:0\n
\n\n

 

\n\n

提示:

\n\n\n\n

 

\n\n

进阶: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?

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