摘要：
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],[2,3],[1,2],[1,3],[1,4] 1 public static List<List<int>> Combination(int n, int k) 2 { 3 List<List<int>>[] ret = new List<List. 阅读全文
