Given an integer array with all positive numbers and no duplicates, find the number of possible combinations that add up to a positive integer target.

原题：Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T.The same repeated num...

原题：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...

Given a digit string, return all possible letter combinations that the number could represent. A ma

Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses. For example, given n = 3, a solution set is:[ "((()...

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 ...

Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. The same repeated numb...

Given two integers n and k, return all possible combinations of k numbers out of 1 ... n. For example, If n = 4 and k = 2, a solution is:[ [2,4], [3,4],...

该文是关于LeetCode的一个题目，给出了一个候选集合和目标值，要求找到所有候选集合中元素的和等于目标值的集合。使用了回溯法，递归地搜索所有可能的组合。...