zoukankan      html  css  js  c++  java
  • poj2001 Shortest Prefixes

    Shortest Prefixes
    Time Limit: 1000MS   Memory Limit: 30000K
    Total Submissions: 16357   Accepted: 7096

    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

    carbohydrate
    cart
    carburetor
    caramel
    caribou
    carbonic
    cartilage
    carbon
    carriage
    carton
    car
    carbonate
    

    Sample Output

    carbohydrate carboh
    cart cart
    carburetor carbu
    caramel cara
    caribou cari
    carbonic carboni
    cartilage carti
    carbon carbon
    carriage carr
    carton carto
    car car
    carbonate carbona
    

    Source




    #include<iostream>
    #include<cmath>
    #include<cstring>
    #include<cstdlib>
    #include<cstdio>
    #include<algorithm>
    #define F(i,j,n) for(int i=j;i<=n;i++)
    #define D(i,j,n) for(int i=j;i>=n;i--)
    #define ll long long
    #define pa pair<int,int>
    #define maxn 20005
    #define inf 1000000000
    using namespace std;
    struct trie_type
    {
    	int cnt,next[30];
    }t[maxn];
    int tot=0,n=0;
    char s[1005][25];
    inline void insert(char *ch)
    {
    	int p=0,l=strlen(ch);
    	F(i,0,l-1)
    	{
    		int tmp=ch[i]-'a';
    		if (!t[p].next[tmp]) t[p].next[tmp]=++tot;
    		p=t[p].next[tmp];
    		t[p].cnt++;
    	}
    }
    inline void find(char *ch)
    {
    	int p=0,l=strlen(ch);
    	printf("%s ",ch);
    	F(i,0,l-1)
    	{
    		printf("%c",ch[i]);
    		int tmp=ch[i]-'a';
    		p=t[p].next[tmp];
    		if (t[p].cnt==1) break;
    	}
    	printf("
    ");
    }
    int main()
    {
    	while (~scanf("%s",s[++n])) insert(s[n]);
    	F(i,1,n-1) find(s[i]);
    }
    


  • 相关阅读:
    使用VS2013直接升级到VS2019,Cmake编译CCC4.0版本错误记录
    最近使用LuaSqlite3时,不得不说的——事务提交ATTACH语句的巨坑
    LuaSocket学习之tcp服务端
    LuaSocket HTTP 初识记录
    LuaRocks安装教程
    Lua5.1-----函数可变参数详解
    DataTable与json互转,字段类型信息丢失问题初探
    json数组与对象数组
    asp.net中封装路由信息的对象--RouteData源码
    人类的心理行为模式(几个心理学实验)
  • 原文地址:https://www.cnblogs.com/mthoutai/p/7137702.html
Copyright © 2011-2022 走看看