Given a collection of numbers that might contain duplicates, return all possible unique permutations. Example: Input: [1,1,2] Output: [ [1,1,2], [1,2,1], [2,1,1] ] 题意: 打印全排列,注明了给定序列可含有重复元素 Solution1: Backtracking code class Solution { public List<Lis…
Given a collection of numbers that might contain duplicates, return all possible unique permutations. For example,[1,1,2] have the following unique permutations: [ [1,1,2], [1,2,1], [2,1,1] ] 46. Permutations 的拓展,这题数组含有重复的元素.解法和46题,主要是多出处理重复的数字. 先对nu…
82. 删除排序链表中的重复元素 II 82. Remove Duplicates from Sorted List II 题目描述 给定一个排序链表,删除所有含有重复数字的节点,只保留原始链表中没有重复出现的数字. LeetCode82. Remove Duplicates from Sorted List II中等 示例 1: 输入: 1->2->3->3->4->4->5 输出: 1->2->5 示例 2: 输入: 1->1->1->…