Permutations II Given a collection of numbers that might contain duplicates, return all possible unique permutations. For example,[1,1,2] have ...
这个比一般的backtrack要难一点,有 个限制因素。 某个元素在某次递归中只能用一次。 重复。 主要就是这 个因素。 先SORT一下。 用visited 记录哪个元素用过,用过直接跳过。 然后每个递归里,除了第一个元素之外,不许重复。 剩下的就是比较基础的backtrack了,记得每次要把visited恢复。 这不是重点。。重点是有个用SWAP的方法, 都可以那么做。研究一下。。 思路是这样的 ...
2016-11-11 12:28 0 1420 推荐指数:
Permutations II Given a collection of numbers that might contain duplicates, return all possible unique permutations. For example,[1,1,2] have ...
Given a collection of numbers that might contain duplicates, return all possible unique permutations. Example: 这道题是之前那道 Permutations 的延伸 ...
题目: Given a collection of numbers that might contain duplicates, return all possible unique permutations. For example, [1,1,2] have ...
Given a collection of numbers that might contain duplicates, return all possible unique permutations. For example,[1,1,2] have the following unique ...
原题地址:https://oj.leetcode.com/problems/permutations-ii/ 题意: Given a collection of numbers that might contain duplicates ...
一.Elk简介 什么是ELK? 什么是Elasticsearch: 分片:把数据拆分为几份,并写入到指定分片里面,如:0 1,多个分片一定程度可以提升读写性能 副本:对 ...
Permutations Given a collection of numbers, return all possible permutations. For example, [1,2,3] have the following permutations: [1,2,3], [1,3,2 ...
Permutations II Given a collection of numbers that might contain duplicates, return all possible unique permutations.For example,[1,1,2] have ...