Find all possible combinations of k numbers that add up to a number n, given that only numbers from 1 to 9 can be used and each combination should be a unique set of numbers.
题意:1..9个数,从中选择k个,和为n,要求输出所有满足题意的集合。
思路:枚举子集,根据sum和集合元素个数剪枝即可。
阅读更多Given two integers n and k, return all possible combinations of k numbers out of 1 ... n.
思路:就是枚举子集,根据集合的大小剪枝。。。最后只要集合大小为k的集合
1/* *********************************************** 2Author :111qqz 3Created Time :2017年04月13日 星期四 15时25分37秒 4File Name :77.cpp 5************************************************ */ 6class …
阅读更多* Total Accepted: **106670** * Total Submissions: **329718** * Difficulty: **Medium** * Contributor: **LeetCode**
Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T.
Each number in C may only be used once in the …
阅读更多