博客
关于我
Shortest Prefixes(trie树唯一标识)
阅读量:621 次
发布时间:2019-03-13

本文共 2323 字,大约阅读时间需要 7 分钟。

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", "ca", "car", "carb", "carbo", and "carbon". Note that the empty string is not considered a prefix in this problem, but every non-empty string is considered to be a prefix of itself. In everyday language, we tend to abbreviate words by prefixes. For example, "carbohydrate" is commonly abbreviated by "carb". In this problem, given a set of words, you will find for each word the shortest prefix that uniquely identifies the word it represents.
In the sample input below, "carbohydrate" can be abbreviated to "carboh", but it cannot be abbreviated to "carbo" (or anything shorter) because there are other words in the list that begin with "carbo".
An exact match will override a prefix match. For example, the prefix "car" matches the given word "car" exactly. Therefore, it is understood without ambiguity that "car" is an abbreviation for "car" , not for "carriage" or any of the other words in the list that begins with "car".

Input

The input contains at least two, but no more than 1000 lines. Each line contains one word consisting of 1 to 20 lower case letters.

Output

The output contains the same number of lines as the input. Each line of the output contains the word from the corresponding line of the input, followed by one blank space, and the shortest prefix that uniquely (without ambiguity) identifies this word.

Sample Input

carbohydratecartcarburetorcaramelcariboucarboniccartilagecarboncarriagecartoncarcarbonate

Sample Output

carbohydrate carbohcart cartcarburetor carbucaramel caracaribou caricarbonic carbonicartilage carticarbon carboncarriage carrcarton cartocar carcarbonate carbona 题解:让找唯一能确定一个单词的前缀;我们想到当唯一确定的时候必定word[k]是1;那么很好解决了 代码:
1 #include
2 #include
3 #include
4 #include
5 #include
6 #include
7 #define mem(x,y) memset(x,y,sizeof(x)) 8 using namespace std; 9 typedef long long LL;10 const int MAXN=10100;11 char s[1010][30];12 int ch[MAXN][30],word[MAXN];13 int sz;14 void initial(){15 sz=1;16 mem(word,0);17 }18 void insert(char *s){19 int len=strlen(s);20 int j,k=0;21 for(int i=0;i

 

转载地址:http://nueaz.baihongyu.com/

你可能感兴趣的文章
mysql 状态检查,备份,修复
查看>>
MySQL 用 limit 为什么会影响性能?
查看>>
MySQL 用 limit 为什么会影响性能?有什么优化方案?
查看>>
MySQL 用户权限管理:授权、撤销、密码更新和用户删除(图文解析)
查看>>
mysql 用户管理和权限设置
查看>>
MySQL 的 varchar 水真的太深了!
查看>>
mysql 的GROUP_CONCAT函数的使用(group_by 如何显示分组之前的数据)
查看>>
MySQL 的instr函数
查看>>
MySQL 的mysql_secure_installation安全脚本执行过程介绍
查看>>
MySQL 的Rename Table语句
查看>>
MySQL 的全局锁、表锁和行锁
查看>>
mysql 的存储引擎介绍
查看>>
MySQL 的存储引擎有哪些?为什么常用InnoDB?
查看>>
Mysql 知识回顾总结-索引
查看>>
Mysql 笔记
查看>>
MySQL 精选 60 道面试题(含答案)
查看>>
mysql 索引
查看>>
MySQL 索引失效的 15 种场景!
查看>>
MySQL 索引深入解析及优化策略
查看>>
MySQL 索引的面试题总结
查看>>