[LeetCode]77.Combinations

題目 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], ] 思路 典型的遞歸回溯法。 （1

>>阅读原文<<