Shortest Prefixes Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 17683   Accepted: 7686 Description A prefix of a string is a substring starting at the beginning of the given string. The prefixes of "carbon" are: "c", &qu…

Shortest Prefixes Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 18687   Accepted: 8087 Description A prefix of a string is a substring starting at the beginning of the given string. The prefixes of "carbon" are: "c", &qu…

传送门 题目大意:求最短唯一前缀 题解:Trie树 把单词一个个插入,每个字母节点v[]++;然后输出时输出到v[]为1的点, v[]=1说明只有这个单词经过. 代码 : #include<iostream> #include<cstdio> #include<cstring> #include<algorithm> #define N 100009 using namespace std; int n,cnt; ][],v[N]; ]; void inse…

Shortest Prefixes 题意:输入不超过1000个字符串,每个字符串为小写字母,长度不超过20:之后输出每个字符串可以简写的最短前缀串: Sample Input carbohydrate cart carburetor caramel caribou carbonic cartilage carbon carriage carton car carbonate Sample Output carbohydrate carboh (carbo不止一个字符串含有,所以不能作为简写符号)…

题目链接:POJ 2001 Description A prefix of a string is a substring starting at the beginning of the given string. The prefixes of "carbon" are: "c", "ca", "car", "carb", "carbo", and "carbon"…

Description A prefix of a string is a substring starting at the beginning of the given string. The prefixes of "carbon" are: "c", "ca", "car", "carb", "carbo", and "carbon". Note that t…

题目大意就是帮你给N条字符串,每条长度不超过20.问要将他们单一识别出来,每个字符串最短可以缩为多短. 如: abc abcdefg bc adef 这四个字符串就可分别缩写为 abc abcd b ad 方法:   字典树(可以参阅http://s.acmore.net/show_article/show/58). 另外我还用了一个bool数组last用来记录每个单一识别的字符串最短可以到哪个位置,他的下标就是字典树中每个字母对应的序号 方法如下:(以上面的为例) 当输入的字符串在某一个位置开…

题意:给你一组串,求每个串在组中唯一标志的最短前缀 分析:保存树上经过各节点的单词个数,扫描每个串当经过节点单词个数是一(能唯一标志)结束 #include <map> #include <set> #include <list> #include <cmath> #include <queue> #include <stack> #include <cstdio> #include <vector> #inc…

Shortest Prefixes Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 15574   Accepted: 6719 Description A prefix of a string is a substring starting at the beginning of the given string. The prefixes of "carbon" are: "c", &qu…

Shortest Prefixes Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 15610   Accepted: 6734 Description A prefix of a string is a substring starting at the beginning of the given string. The prefixes of "carbon" are: "c", &qu…

Shortest Prefixes Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 15948   Accepted: 6887 Description A prefix of a string is a substring starting at the beginning of the given string. The prefixes of "carbon" are: "c", &qu…

<题目链接> 题目大意: 找出能唯一标示一个字符串的最短前缀,如果找不出,就输出该字符串. 解题分析: Trie树的简单应用,对于每个单词的插入,都在相应字符对应的节点 num 值+1 ,这样在查询的时候,如果遍历到num值为1的节点,就可以确定,该前缀能够唯一确定一个字符串,或者是一直遍历到NULL,这时直接输出它本身即可. 指针式Trie树: #include <cstdio> #include <cstring> #include <algorithm>…

直接用Trie树即可. 每个节点统计经过该点的单词数,遍历时当经过的单词数为1时即为合法的前缀. type arr=record next:array['a'..'z'] of longint; w:longint; end; ; ..maxn] of arr; s:..maxn] of ansistring; i,j,m,n,now,num:longint; begin while not eof do begin inc(n); readln(s[n]); end; num:=; to n…

读入建立一棵字母树,并且每到一个节点就增加这个节点的覆盖数. 然后再重新扫一遍,一旦碰到某个覆盖数为1就是这个单词的最短前缀了. 不知为何下面的程序一直有bug……不知是读入的问题? type node=record w:longint; go:array['a'..'z'] of longint; end; var i,n,tot:longint; s:string; a,ans:..] of string; t:..] of node; procedure getintree(s:strin…

Description A prefix of a string is a substring starting at the beginning of the given string. The prefixes of "carbon" are: "c", "ca", "car", "carb", "carbo", and "carbon". Note that t…

Implement a trie with insert, search, and startsWith methods. Note: You may assume that all inputs are consist of lowercase letters a-z. 参考百度百科:Trie树 a trie, also called digital tree and sometimes radix tree or prefix tree (as they can be searched by…

来源于英文“retrieval”.   Trie树就是字符树,其核心思想就是空间换时间. 举个简单的例子.   给你100000个长度不超过10的单词.对于每一个单词,我们要判断他出没出现过,如果出现了,第一次出现第几个位置.这题当然可以用hash来,但是我要介绍的是trie树.在某些方面它的用途更大.比如说对于某一个单词,我要询问它的前缀是否出现过.这样hash就不好搞了,而用trie还是很简单. 现在回到例子中,如果我们用最傻的方法,对于每一个单词,我们都要去查找它前面的单词中是否有它.那么…

Problem Description IP lookup is one of the key functions of routers for packets forwarding and classifying. Generally, IP lookup can be simplified as a Longest Prefix Matching (LPM) problem. That's to find the longest prefix in the Forwarding Inform…

描述 http://poj.org/problem?id=2001 给出一组单词,求每个单词的最小唯一前缀. 最小唯一前缀:该前缀不能是其他单词的前缀,并且最小,如果不存在,则为该单词本身. Shortest Prefixes Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 16921   Accepted: 7338 Description A prefix of a string is a substring star…

http://acm.hdu.edu.cn/showproblem.php?pid=4570 Multi-bit Trie Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 446    Accepted Submission(s): 169 Problem Description IP lookup is one of the key f…

主题链接:http://poj.org/problem?id=2001 Description A prefix of a string is a substring starting at the beginning of the given string. The prefixes of "carbon" are: "c", "ca", "car", "carb", "carbo",…

Problem Description IP lookup is one of the key functions of routers for packets forwarding and classifying. Generally, IP lookup can be simplified as a Longest Prefix Matching (LPM) problem. That's to find the longest prefix in the Forwarding Inform…

package com.shundong.utils; import java.util.ArrayList; import java.util.Iterator; import java.util.List; /** * 一个只能处理26个字母的单词树(trie) * 空间换时间 T(n) = O(n) * ps:如果缺陷 欢迎留言 * @author shundong * @data 2018-10-13 */ public class FindWordsTrie{ //一个Trie树有一个…

题目链接 Problem Description IP lookup is one of the key functions of routers for packets forwarding and classifying. Generally, IP lookup can be simplified as a Longest Prefix Matching (LPM) problem. That's to find the longest prefix in the Forwarding I…

Description A prefix of a string is a substring starting at the beginning of the given string. The prefixes of "carbon" are: "c", "ca", "car", "carb", "carbo", and "carbon". Note that t…

Trie,又经常叫前缀树,字典树等等.它有很多变种,如后缀树,Radix Tree/Trie,PATRICIA tree,以及bitwise版本的crit-bit tree.当然很多名字的意义其实有交叉. 定义 在计算机科学中,trie,又称前缀树或字典树,是一种有序树,用于保存关联数组,其中的键通常是字符串.与二叉查找树不同,键不是直接保存在节点中,而是由节点在树中的位置决定.一个节点的所有子孙都有相同的前缀,也就是这个节点对应的字符串,而根节点对应空字符串.一般情况下,不是所有的节点都有对应…

基于trie树做一个ac自动机 #!/usr/bin/python # -*- coding: utf-8 -*- class Node: def __init__(self): self.value = None self.children = {} # children is of type {char, Node} self.fre = 0 self.father = None self.fail = None def CMP(a, b): return b.fre - a.fre cla…

之前的软件设计与开发实践课程中,自己构思的大作业题目.做的具有核心功能,但是还欠缺边边角角的小功能和持久化数据结构,先放出来,有机会一点点改.github:https://github.com/chuxiuhong/smarteditor 数据结构,使用过程截图以及源代码如下: #数据结构 **trie树** trie树相应的介绍点击链接 https://en.wikipedia.org/wiki/Trie trie树在python文件中的类型定义 Node定义 #GUI设计界面 首先,用较大的…

Implement a trie with insert, search, and startsWith methods. Note:You may assume that all inputs are consist of lowercase letters a-z. 这道题让我们实现一个重要但又有些复杂的数据结构-字典树, 又称前缀树或单词查找树,详细介绍可以参见网友董的博客,例如,一个保存了8个键的trie结构,"A", "to", "tea&quo…

hihocoder 1014 : Trie树 link: https://hihocoder.com/problemset/problem/1014 题意: 实现Trie树,实现对单词的快速统计. #include <iostream> #include <cstdio> using namespace std; typedef struct TrieNode{ int cnt; struct TrieNode *next[26]; }TrieNode; TrieNode memo…