题目: Given a string s, return all the palindromic permutations (without duplicates) of it. Return an empty list if no palindromic permutation could be form. For example: Given s = "aabb", return ["abba", "baab"]. Given s = &qu…

266.Palindrome Permutation https://www.cnblogs.com/grandyang/p/5223238.html 判断一个字符串的全排列能否形成一个回文串. 能组成回文串,在字符串长度为偶数的情况下,每个字符必须成对出现:奇数的情况下允许一个字符单独出现,其他字符都必须成对出现.用一个set对相同字符进行加减即可. class Solution { public: /** * @param s: the given string * @return: if…

题目链接:https://leetcode.com/submissions/detail/55876321/ 自己的做法,30个测试用例通过了29例,终究还是有一个系列类型的是无法通过的,因为自己妄想在permutation的代码上,通过排序来进行.然而,每一次同第一个元素交换位置之后,进入了递归,此时数组nums并不是有序的!!! 来看看自己的这段代码,谨记教训,然后还是去看看大神们的思路吧! class Solution { public: vector<vector<int>>…

Given a string s, return all the palindromic permutations (without duplicates) of it. Return an empty list if no palindromic permutation could be form. For example: Given s = "aabb", return ["abba", "baab"]. Given s = "a…

Question Given a string s, return all the palindromic permutations (without duplicates) of it. Return an empty list if no palindromic permutation could be form. For example: Given s = "aabb", return ["abba", "baab"]. Given s…

Given a string s, return all the palindromic permutations (without duplicates) of it. Return an empty list if no palindromic permutation could be form. For example: Given s = "aabb", return ["abba", "baab"]. Given s = "a…

Given a string s, return all the palindromic permutations (without duplicates) of it. Return an empty list if no palindromic permutation could be form. For example: Given s = "aabb", return ["abba", "baab"]. Given s = "a…

原题链接在这里:https://leetcode.com/problems/palindrome-permutation-ii/ 题目: Given a string s, return all the palindromic permutations (without duplicates) of it. Return an empty list if no palindromic permutation could be form. For example: Given s = "aabb&…

Problem: Given a string s, return all the palindromic permutations (without duplicates) of it. Return an empty list if no palindromic permutation could be form. For example: Given s = "aabb", return ["abba", "baab"]. Given s…

Palindrome Permutation I Given a string, determine if a permutation of the string could form a palindrome. For example,"code" -> False, "aab" -> True, "carerac" -> True. Hint: Consider the palindromes of odd vs even…

Palindrome Permutation Given a string, determine if a permutation of the string could form a palindrome. For example,"code" -> False, "aab" -> True, "carerac" -> True. Hint: Consider the palindromes of odd vs even le…

Given a string, determine if a permutation of the string could form a palindrome. For example,"code" -> False, "aab" -> True, "carerac" -> True. Hint: Consider the palindromes of odd vs even length. What difference d…

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], and [2,1,1]. 这道题是之前那道Permutations 全排列的延伸,由于输入数组有可能出现重复数字,如果按照之前的算法运算,会有…

Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers. If such arrangement is not possible, it must rearrange it as the lowest possible order (ie, sorted in ascending order). The replaceme…

(M) Permutations (M) Permutations II (M) Permutation Sequence (M) Palindrome Permutation II…

原题链接在这里:https://leetcode.com/problems/palindrome-permutation/ 题目: Given a string, determine if a permutation of the string could form a palindrome. For example,"code" -> False, "aab" -> True, "carerac" -> True. 题解: 看…

A reverse version of the Dictionary algorithm :) If you AC-ed "Next Permutation II", copy it over and just reverse the conditions. class Solution { public: /** * @param nums: An array of integers * @return: An array of integers that's previous p…

题目: A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside down). Find all strobogrammatic numbers that are of length = n. For example,Given n = 2, return ["11","69","88","96&…

By now, you are given a secret signature consisting of character 'D' and 'I'. 'D' represents a decreasing relationship between two numbers, 'I' represents an increasing relationship between two numbers. And our secret signature was constructed by a s…

combination sum I.permutation I.subsets  I 是组合和.全排列.子集的第一种情况,给定数组中没有重复的元素. combination sum II.permutation II.subsets  II 是组合和.全排列.子集的第而种情况,给定数组中有重复元素. combination sum I中元素每个可以被多次使用,所以每次遍历都是从当前元素开始,然后往后面遍历. combination sum II中元素只能被使用一次,所以算下个元素时,只能从当前元…

一.开篇 Permutation,排列问题.这篇博文以几道LeetCode的题目和引用剑指offer上的一道例题入手,小谈一下这种类型题目的解法. 二.上手 最典型的permutation题目是这样的: Given a collection of numbers, return all possible permutations. For example,[1,2,3] have the following permutations:[1,2,3], [1,3,2], [2,1,3], [2,3…

转:http://www.cnblogs.com/felixfang/p/3705754.html 一.开篇 Permutation,排列问题.这篇博文以几道LeetCode的题目和引用剑指offer上的一道例题入手,小谈一下这种类型题目的解法. 二.上手 最典型的permutation题目是这样的: Given a collection of numbers, return all possible permutations. For example,[1,2,3] have the foll…

本文解说4道关于permutation的题目: 1. Permutation:输出permutation--基础递归 2. Permutation Sequence: 输出字典序排列的第k个permutation--推理3. Next Permutation:给定一个permutation中的序列,求字典序它的下一个permutation是什么--逻辑推理4. Permutation II:和第一题有细微的区别: 对于一个可能有反复元素的数组输出全部permutation--有条件dfs    …

Given a string, determine if a permutation of the string could form a palindrome. Example 1: Input: "code" Output: false Example 2: Input: "aab" Output: true Example 3: Input: "carerac" Output: true Hint: Consider the palindr…

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] ] 这道题是之前那道 Permutations 的延伸,由于输入数组有可能出现重复数字,如果按照之前的算法运算,会有重复排列产生,我们要避免重复的产生,在递归函数中要判断前面一…

Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers. If such arrangement is not possible, it must rearrange it as the lowest possible order (ie, sorted in ascending order). The replaceme…

Yet Another Source Code for LintCode Current Status : 232AC / 289ALL in Language C++, Up to date (2016-02-10) For more problems and solutions, you can see my LintCode repository. I'll keep updating for full summary and better solutions. See cnblogs t…

终于将LeetCode的免费题刷完了,真是漫长的第一遍啊,估计很多题都忘的差不多了,这次开个题目汇总贴,并附上每道题目的解题连接,方便之后查阅吧~ 477 Total Hamming Distance 44.10% Meidum 475 Heaters  30.20% Easy 474 Ones and Zeroes  34.90% Meidum 473 Matchsticks to Square  31.80% Medium 472 Concatenated Words 29.20% Hard…

Given a string which consists of lowercase or uppercase letters, find the length of the longest palindromes that can be built with those letters. This is case sensitive, for example "Aa" is not considered a palindrome here. Note: Assume the leng…

Palindrome Permutation I/II 要点: oddCount to increase/decrease count II: chars: 先统计,再得到一半的c,相同的在一起,所以是不用排序的(permute去重需要排序) odds: odds只能在中间,所以要存起来,最后直接拼接,不参与permutation.这样就免去了用变量计数来做奇偶判定. https://repl.it/ChGE/1 (I: java) 错误点: java: string foreach loop:…