Permutations II Given a collection of numbers that might contain duplicates, return all possible unique permutations. For example,[1,1,2] have ...
這個比一般的backtrack要難一點,有 個限制因素。 某個元素在某次遞歸中只能用一次。 重復。 主要就是這 個因素。 先SORT一下。 用visited 記錄哪個元素用過,用過直接跳過。 然后每個遞歸里,除了第一個元素之外,不許重復。 剩下的就是比較基礎的backtrack了,記得每次要把visited恢復。 這不是重點。。重點是有個用SWAP的方法, 都可以那么做。研究一下。。 思路是這樣的 ...
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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: 這道題是之前那道 Permutations 的延伸 ...
題目: 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 ...
原題地址:https://oj.leetcode.com/problems/permutations-ii/ 題意: Given a collection of numbers that might contain duplicates ...
一.Elk簡介 什么是ELK? 什么是Elasticsearch: 分片:把數據拆分為幾份,並寫入到指定分片里面,如:0 1,多個分片一定程度可以提升讀寫性能 副本:對 ...
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 ...