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事务隔离级别:读未提交、读已提交、可重复读和串行
查看>>
MySQL事务隔离级别:读未提交、读已提交、可重复读和串行
查看>>
mysql五补充部分:SQL逻辑查询语句执行顺序
查看>>
mysql交互式连接&非交互式连接
查看>>
MySQL什么情况下会导致索引失效
查看>>
Mysql什么时候建索引
查看>>
MySql从入门到精通
查看>>
MYSQL从入门到精通(一)
查看>>
MYSQL从入门到精通(二)
查看>>
mysql以下日期函数正确的_mysql 日期函数
查看>>
mysql以服务方式运行
查看>>
mysql优化--索引原理
查看>>
mysql优化概述(范式.索引.定位慢查询)
查看>>
MySQL优化配置详解
查看>>
Mysql优化高级篇(全)
查看>>
mysql会员求积分_MySql-统计所有会员的最高前10次的积分和
查看>>
mysql会对联合索性排序优化_MySQL索引优化实战
查看>>
MySQL作为服务端的配置过程与实际案例
查看>>
Mysql使用命令行备份数据
查看>>
MySQL保姆级教程(SQL语法基础篇)从小白到高手的进阶指南,收藏这一篇就够了
查看>>