Data Structure Problem Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://acm.uestc.edu.cn/#/problem/show/483 Description Data structure is a fundamental course of Computer Science, so that each contestant is highly likely to solve this data structu…

题目链接  ZOJ Monthly, March 2018 Problem F 题意很明确 这个模数很奇妙,在$[0, mod)$的所有数满足任意一个数立方$48$次对$mod$取模之后会回到本身. 所以开$48$棵线段树,和一个永久标记.当对某个区间操作时对这个区间加一层永久标记. 即当前我要查找的第$x$层,实际找的是第$up[i] + x$层. 时间复杂度$O(48nlogn)$ #include <bits/stdc++.h> using namespace std; #define…

不难发现,问题即求满足以下条件的$(i,j)$对数: 1.$1\le i<j\le n$且$a_{i}=a_{j}$ 2.$\min_{i\le k\le j}y_{k}\ge l$且$\max_{i\le k\le j}y_{k}\le r$ 先考虑条件1,枚举$1\le x\le n$,并对满足$a_{i}=x$的$i$个数$cnt$分类讨论: 1.若$cnt\le B$(其中$B$为常数),那么$a_{i}=a_{j}=x$的区间个数和(指对所有这样的$x$)不超过$nB$,暴力预处理出此…

(四边形不等式的套路题) 对于某一组$a_{i}$,显然可以区间dp,设$f_{l,r}$表示区间$[l,r]$​的答案,则转移即$$f_{l,r}=\begin{cases}0&(l=r)\\\sum_{i=l}^{r}\sum_{j=l}^{r}dist(a_{i},a_{j})+\min_{l\le i<r}(f_{l,i}+f_{i+1,r})&(l<r)\end{cases}$$为了方便,对于$l<r$定义$f_{l,r}$的最优决策为后者取到$\min$时的(…

首先可以证明,点积最值的点对都是都是在凸包上,套用题解的证明:假设里两个点都不在凸包上, 考虑把一个点换成凸包上的点(不动的那个点), 不管你是要点积最大还是最小, 你都可以把那个不动的点跟原点拉一条直线, 然后把所有的点投影到这条直线上, 要找的无非就是这条直线最前面或者最后面的两个点.这两个点不可能是不在凸包上的点.同理我们可以把另一个点移到凸包上. 由于数据随机生成,那么生成凸包上的点的个数的期望是logn,而且删的点落在凸包上的概率是logn/n,所以只需要对每次删点和加点暴力重构凸包即…

Design a data structure that supports the following two operations: void addWord(word) bool search(word) search(word) can search a literal word or a regular expression string containing only letters a-z or .. A . means it can represent any one letter…

题目: Design a data structure that supports the following two operations: void addWord(word) bool search(word) search(word) can search a literal word or a regular expression string containing only letters a-z or .. A . means it can represent any one le…

Question Design a data structure that supports the following two operations: void addWord(word) bool search(word) search(word) can search a literal word or a regular expression string containing only letters a-z or .. A . means it can represent any o…

字典树(Trie树相关) 208. Implement Trie (Prefix Tree) Implement a trie with insert, search, and startsWith methods. (Medium) Note:You may assume that all inputs are consist of lowercase letters a-z. 分析: 字典树即前缀匹配树,在空间不是很影响的情况下一般采用如下数据结构存储Trie节点 class TrieNod…

题目 Source http://acm.hdu.edu.cn/showproblem.php?pid=5739 Description Professor Zhang has an undirected graph G with n vertices and m edges. Each vertex is attached with a weight wi. Let Gi be the graph after deleting the i-th vertex from graph G. Pro…

题目链接: Basic Data Structure Time Limit: 7000/3500 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 207    Accepted Submission(s): 41 Problem Description Mr. Frog learned a basic data structure recently, which is called…

Basic Data Structure Time Limit: 7000/3500 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Problem Description Mr. Frog learned a basic data structure recently, which is called stack.There are some basic operations of stack: ∙ PUSH x: p…

Data Structure? Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Problem Description Data structure is one of the basic skills for Computer Science students, which is a particular way of storing and organizing data…

Design a data structure that supports the following two operations: void addWord(word) bool search(word) search(word) can search a literal word or a regular expression string containing only letters a-z or .. A . means it can represent any one letter…

https://leetcode.com/problems/add-and-search-word-data-structure-design/ Design a data structure that supports the following two operations: void addWord(word) bool search(word) search(word) can search a literal word or a regular expression string co…

https://leetcode.com/problems/add-and-search-word-data-structure-design/ 本题是在Trie树进行dfs+backtracking操作. Trie树模板代码见:http://www.cnblogs.com/fu11211129/p/4952255.html 题目介绍: Design a data structure that supports the following two operations: void addWord…

leetcode面试准备:Add and Search Word - Data structure design 1 题目 Design a data structure that supports the following two operations: void addWord(word) bool search(word) search(word) can search a literal word or a regular expression string containing on…

Basic Data Structure Time Limit: 7000/3500 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 872    Accepted Submission(s): 236 Problem Description Mr. Frog learned a basic data structure recently, which is called stac…

11995 - I Can Guess the Data Structure! Time limit: 1.000 seconds Problem I I Can Guess the Data Structure! There is a bag-like data structure, supporting two operations: 1 x Throw an element x into the bag. 2 Take out an element from the bag. Given…

题目链接 写一个数据结构, 支持两种操作. 加入一个字符串, 查找一个字符串是否存在.查找的时候, '.'可以代表任意一个字符. 显然是Trie树, 添加就是正常的添加, 查找的时候只要dfs查找就可以. 具体dfs方法看代码. struct node { node *next[]; int idEnd; node() { memset(next, NULL, sizeof(next)); idEnd = ; } }; class WordDictionary { public: // Adds…

Source:http://v0ids3curity.blogspot.com/2015/04/data-structure-recovery-using-pin-and.html -------------------------------- Data Structure Recovery using PIN and PyGraphviz   This is a simple POC PIN tool to recover data structures in dynamically lin…

Basic Data Structure Time Limit: 7000/3500 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 982    Accepted Submission(s): 253 Problem Description Mr. Frog learned a basic data structure recently, which is called stac…

C - Data Structure? Time Limit:5000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Submit Status Practice id=27724" class="ui-button ui-widget ui-state-default ui-corner-all ui-button-text-only" style="display:inline-…

Add and Search Word - Data structure design Design a data structure that supports the following two operations: void addWord(word) bool search(word) search(word) can search a literal word or a regular expression string containing only letters a-z or …

Design a data structure that supports the following two operations: void addWord(word) bool search(word) search(word) can search a literal word or a regular expression string containing only letters a-z or .. A . means it can represent any one letter…

字典树(查找树) 26个分支作用:检测字符串是否在这个字典里面插入.查找 字典树与哈希表的对比:时间复杂度:以字符来看:O(N).O(N) 以字符串来看:O(1).O(1)空间复杂度:字典树远远小于哈希表 前缀相关的题目字典树优于哈希表字典树可以查询abc是否有ab的前缀 字典树常考点:1.字典树实现2.利用字典树前缀特性解题3.矩阵类字符串一个一个字符深度遍历的问题(DFS+trie) dfs树和trie树同时遍历 word searchIIdfs+hash:时间复杂度大,后面遍历到有些字符就…

Problem Description Data structure is one of the basic skills for Computer Science students, which is a particular way of storing and organizing data in a computer so that it can be used efficiently. Today let me introduce a data-structure-like probl…

Implement a data structure supporting the following operations: Inc(Key) - Inserts a new key with value 1. Or increments an existing key by 1. Key is guaranteed to be a non-empty string. Dec(Key) - If Key's value is 1, remove it from the data structu…

Design and implement a TwoSum class. It should support the following operations:add and find. add - Add the number to an internal data structure.find - Find if there exists any pair of numbers which sum is equal to the value. For example,add(1); add(…

http://staff.city.ac.uk/~ross/papers/FingerTree.html Summary We present 2-3 finger trees, a functional representation of persistent sequences supporting access to the ends in amortized constant time, and concatenation and splitting in time logarithmi…