[题解]Palindrome pairs [Codeforces159D] 传送门:\(Palindrome\) \(pairs\) \([CF159D]\) [题目描述] 给定一个长度为 \(N\) 的字符串 \(S\),求有多少四元组 \((l_1,r_1,l_2,r_2)\) 满足 \(1 \leqslant l_1 \leqslant r_1 \leqslant l_2 \leqslant r_2 \leqslant N\) 且 \(S[l1...r1],\) \([Sl2...r2]\…

原题链接在这里:https://leetcode.com/problems/palindrome-pairs/ 题目: Given a list of unique words, find all pairs of distinct indices (i, j) in the given list, so that the concatenation of the two words, i.e. words[i] + words[j] is a palindrome. Example 1:Giv…

题目地址:http://blog.csdn.net/shiyuankongbu/article/details/10004443 /* 题意:在i前面找回文子串,在i后面找回文子串相互配对,问有几对 DP:很巧妙的从i出发向两头扩展判断是否相同来找回文串 dpr[i] 代表记录从0到i间的回文子串的个数,dpl[i] 代表记录i之后的回文子串个数 两两相乘就行了 详细解释:http://blog.csdn.net/shiyuankongbu/article/details/10004443 */…

Given a list of unique words, find all pairs of distinct indices (i, j) in the given list, so that the concatenation of the two words, i.e. words[i] + words[j] is a palindrome. Example 1: Input: ["abcd","dcba","lls","s&q…

lc132 Palindrome Pairs 2 大致与lc131相同,这里要求的是最小分割方案 同样可以分割成子问题 dp[i][j]还是表示s(i~j)是否为palindrome res[i]则用来记录s(0~i)的最小cut数 class Solution { public int minCut(String s) { int[] dp = new int[s.length()]; boolean[][] isP = new boolean[s.length()][s.length()];…

lc131 Palindrome Pairs 解法1: 递归 观察题目,要求,将原字符串拆成若干子串,且这些子串本身都为Palindrome 那么挑选cut的位置就很有意思,后一次cut可以建立在前一次cut的基础上 举例来说 "aab" 第一次cut"a" "ab" 第二次cut"a" "b" 很容易总结出规律,s(i, j)被i=<k<j,截断 若s(i,k)本身就是palindrome,那…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 HashTable 相似题目 参考资料 日期 题目地址:https://leetcode.com/problems/palindrome-pairs/description/ 题目描述 Given a list of unique words, find all pairs of distinct indices (i, j) in the give…

Given a list of unique words. Find all pairs of distinct indices (i, j) in the given list, so that the concatenation of the two words, i.e. words[i] + words[j] is a palindrome. Example 1:Given words = ["bat", "tab", "cat"]Ret…

1. Description Given a list of unique words. Find all pairs of distinct indices (i, j) in the given list, so that the concatenation of the two words, i.e. words[i] + words[j] is a palindrome. Example 1: Given words = ["bat", "tab", &qu…

Given a list of unique words. Find all pairs of distinct indices (i, j) in the given list, so that the concatenation of the two words, i.e. words[i] + words[j] is a palindrome. Example 1:Given words = ["bat", "tab", "cat"]Ret…

Given a list of unique words. Find all pairs of distinct indices (i, j) in the given list, so that the concatenation of the two words, i.e. words[i] + words[j] is a palindrome. Example 1:Given words = ["bat", "tab", "cat"]Ret…

Given a list of unique words, find all pairs of distinct indices (i, j) in the given list, so that the concatenation of the two words, i.e. words[i] + words[j] is a palindrome. Example 1: Given words = ["bat", "tab", "cat"] R…

https://leetcode.com/problems/palindrome-pairs/ Given a list of unique words. Find all pairs of distinct indices (i, j) in the given list, so that the concatenation of the two words, i.e. words[i] + words[j] is a palindrome. Example 1: Given words =…

Question Given a list of unique words, find all pairs of distinct indices (i, j) in the given list, so that the concatenation of the two words, i.e. words[i] + words[j] is a palindrome. Example 1:Given words = ["bat", "tab", "cat&…

Given a list of unique words, find all pairs of distinct indices (i, j) in the given list, so that the concatenation of the two words, i.e. words[i] + words[j] is a palindrome. Example 1: Input: ["abcd","dcba","lls","s&q…

problem: Determine whether an integer is a palindrome. Do this without extra space. click to show spoilers. Some hints: Could negative integers be palindromes? (ie, -1) If you are thinking of converting the integer to string, note the restriction of…

[链接] 我是链接,点我呀:) [题意] 在这里输入题意 [题解] 先用枚举回文串中点的方法. 得到这个字符串中出现的所有的回文. 得到他们的左端点以及右端点. 整理成一个pair<int,int>数组 然后排序. 对于每一个回文串. 查找起点比这个回文串的终点大的所有回文串的个数. [代码] #include <bits/stdc++.h> #define LL long long #define rep1(i,a,b) for (int i = a;i <= b;i++)…

题目:戳这里 题意:给1e5个字符串,问有多少对字符串组合,满足最多只有一种字符有奇数个. 解题思路:每种情况用map存一下就行了.感觉这题自己的代码思路比较清晰,所以写个题解记录一下 附ac代码: 1 #include <bits/stdc++.h> 2 using namespace std; 3 typedef long long ll; 4 const int maxn = 2e5 + 10; 5 const ll mod = 998244353; 6 int arr[33]; 7 i…

题目: 判断一个数字是不是回文数字,即最高位与最低位相同,次高位与次低位相同,... 解法: 求出数字的位数,然后依次求商和求余判断是否相等. 代码: class Solution { public: bool isPalindrome(int x) { ) //负数有符号,肯定不是回文数 return false; ; ) //d与x位数相同 d *= ; while(x) { ) //比较最高位和最低位是否相等 return false; x = x % d / ; //去掉最高位和最低位…

http://codeforces.com/problemset/problem/159/D 题目大意: 给出一个字符串,求取这个字符串中互相不覆盖的两个回文子串的对数. 思路:num[i]代表左端点在i这个位置的回文串个数,然后用树状数组维护sum[i],代表回文串右端点小于等于i的回文串数,总复杂度:O(n^2) #include<cstdio> #include<cmath> #include<algorithm> #include<cstring>…

给定一组独特的单词, 找出在给定列表中不同 的索引对(i, j),使得关联的两个单词,例如:words[i] + words[j]形成回文.示例 1:给定 words = ["bat", "tab", "cat"]返回 [[0, 1], [1, 0]]回文是 ["battab", "tabbat"]示例 2:给定 words = ["abcd", "dcba", &q…

题目如下: 解题思路:对于任意一个word,要找出在wordlist中是否存在与之能组成回文的其他words,有两种思路.一是遍历wordlist:二是对word本身进行分析,找出能组成回文的words,并判断是否存在于wordlist中.显然,第二种思路比较的次数要少很多.怎么找出能组成回文的words呢?只要把后面的字符依次往前复制,并判断是否为回文,直到全部字符复制完成为止,这就能得到所有能与之组成回文的words.以abcd作为前缀为例,首先把d复制到abcd前面得到dabcd,接下来依…

突然很想刷刷题,LeetCode是一个不错的选择,忽略了输入输出,更好的突出了算法,省去了不少时间. dalao们发现了任何错误,或是代码无法通过,或是有更好的解法,或是有任何疑问和建议的话,可以在对应的随笔下面评论区留言,我会及时处理,在此谢过了. 过程或许会很漫长,也很痛苦,慢慢来吧. 编号 题名 过题率 难度 1 Two Sum 0.376 Easy 2 Add Two Numbers 0.285 Medium 3 Longest Substring Without Repeating C…

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…

Given a string S, you are allowed to convert it to a palindrome by adding characters in front of it. Find and return the shortest palindrome you can find by performing this transformation. For example: Given "aacecaaa", return "aaacecaaa&qu…

比赛的时候开G开了3h结果rose说一句那唯一一个AC的是羊的心态就崩了.. 这套题感觉质量挺好然后就back了下 A: AI robots 有三个限制条件:相互能够看见和智商的差.使用主席树,可以维护两个状态,分别是其中一个“看见”和“智商”,这样的做法就无法利用K<=20的条件了. 利用扫描线+线段树,可以解决相互看见的约束(大概是我做过最神的扫描线了)对于一个点,处理出它能够看见的最前和最后点,和它的位置一起当做一条线,最前点加入这个点的位置,最后点删除这个点的影响,点的位置的线相当于一个…

Given a string s, you are allowed to convert it to a palindrome by adding characters in front of it. Find and return the shortest palindrome you can find by performing this transformation. Example 1: Input: "aacecaaa" Output: "aaacecaaa&quo…

Bubble Cup 11 - Finals [Online Mirror, Div. 1] 一场很好玩的题啊! I. Palindrome Pairs 枚举哪种字符出现奇数次. G. AI robots 对\(r\)从大到小排序,然后cdq分治. 注意要对\(q-k,q+k,q\)进行离散化 B. Space Isaac 对原序列做差分,b[i]=a[i]-a[i-1] 如果我们要凑出\(x\),那么集合A中小于\(x\)的数字,要关于\(x/2\)对称,大于\(x\)的数字要关于\((x+m…

回文对 给定一组唯一的单词, 找出所有不同 的索引对(i, j),使得列表中的两个单词, words[i] + words[j] ,可拼接成回文串. 示例 1: 输入: ["abcd","dcba","lls","s","sssll"] 输出: [[0,1],[1,0],[3,2],[2,4]] 解释: 可拼接成的回文串为 ["dcbaabcd","abcddcba"…

Hash Table基础 哈希表(Hash Table)是常用的数据结构,其运用哈希函数(hash function)实现映射,内部使用开放定址.拉链法等方式解决哈希冲突,使得读写时间复杂度平均为O(1). HashMap(std::unordered_map).HashSet(std::unordered_set)的原理与Hash Table一样,它们的用途广泛.用法灵活,接下来侧重于介绍它们的应用. 相关LeetCode题: 706. Design HashMap  题解  705. Des…