Babelfish 分类： 哈希 2015-08-04 09:25 2人阅读 评论(0) 收藏

Babelfish
Time Limit: 3000MS Memory Limit: 65536K
Total Submissions: 36398 Accepted: 15554

Description
You have just moved from Waterloo to a big city. The people here speak an incomprehensible dialect of a foreign language. Fortunately, you have a dictionary to help you understand them.

Input
Input consists of up to 100,000 dictionary entries, followed by a blank line, followed by a message of up to 100,000 words. Each dictionary entry is a line containing an English word, followed by a space and a foreign language word. No foreign word appears more than once in the dictionary. The message is a sequence of words in the foreign language, one word on each line. Each word in the input is a sequence of at most 10 lowercase letters.

Output
Output is the message translated to English, one word per line. Foreign words not in the dictionary should be translated as “eh”.

Sample Input

dog ogday
cat atcay
pig igpay
froot ootfray
loops oopslay

atcay
ittenkay
oopslay

Sample Output

cat
eh
loops

Hint
Huge input and output,scanf and printf are recommended.
一道哈希的题,用字典树过的,不过在输入数据的过程中却卡住了,后来在搜题解知道用sscanf()处理的,见识少啊.

#include <map>
#include <list>
#include <cmath>
#include <queue>
#include <stack>
#include <string>
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <iostream>
#include <algorithm>
#define LL long long
#define eps 1e-9
#define PI acos(-1.0)
#define INF 0x3f3f3f3f
#define CRR fclose(stdin)
#define CWW fclose(stdout)
#define WW freopen("output.txt","w",stdout)
#define RR freopen("input.txt","r",stdin)

using namespace std;

const int MAX = 100010;

char s[MAX][15],c[15];

struct node
{
    int  flag;
    node *next[26];
}*head;
int top;
node * Creat()
{
    node *p;
    p=new node;
    p->flag=0;
    for(int i=0;i<26;i++)
    {
        p->next[i]=NULL;
    }
    return p;
}
void Build_Tree()
{
    node *p=head;
    int a,len=strlen(c);
    for(int i=0;i<len;i++)
    {
        a=c[i]-'a';
        if(!p->next[a])
        {
            p->next[a]=Creat();
        }
        p=p->next[a];
    }
    p->flag=top;//将对应单词的编号赋给它,便于查找
}
int Look()
{
    node *p=head;
    int a,len=strlen(c);
    for(int i=0;i<len;i++)
    {
        a=c[i]-'a';
        if(!p->next[a])
        {
            return 0;
        }
        p=p->next[a];
    }
    if(!p->flag)//查找不到返回零
    {
        return 0;
    }
    else
    {
        return p->flag;
    }
}
int main()
{
    head=Creat();
    top=1;
    int t;
    char cc[30];
    while(gets(cc)&&cc[0]!='\0')
    {

        sscanf(cc,"%s %s",s[top],c);
        Build_Tree();
        top++;

    }
    while(~scanf("%s",c))
    {
        t=Look();
        if(t)
        {
            printf("%s\n",s[t]);
        }
        else
        {
            printf("eh\n");
        }
    }
    return 0;
}

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