POJ 2503-Babelfish【字典树】

逃离我推掉我的手 2022-07-24 07:06 144阅读 0赞

Babelfish

<table> 
 <tbody> 
  <tr> 
   <td><strong>Time Limit:</strong>&nbsp;3000MS</td> 
   <td>&nbsp;</td> 
   <td><strong>Memory Limit:</strong>&nbsp;65536K</td> 
  </tr> 
  <tr> 
   <td><strong>Total Submissions:</strong>&nbsp;39270</td> 
   <td>&nbsp;</td> 
   <td><strong>Accepted:</strong>&nbsp;16778</td> 
  </tr> 
 </tbody> 
</table>

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.

Source

[Waterloo local 2001.09.22][]

解题思路：

主要是空哪一行有点坑。

#include<stdio.h>
    #include<string.h>
    #include<algorithm>
    using namespace std;
    char word[100100][12];
    typedef struct node
    {
    	int cnt;
    	node *next[26];
    }Trie;
    Trie root;
    void ct(char *str,int jj)
    {
    	//printf("%d\n",jj);
    	int len,i,j;
    	len=strlen(str);
    	Trie *p=&root,*q;
    	for(i=0;i<len;i++)
    	{
    		int id=str[i]-'a';
    		if(p->next[id]==NULL)
    		{
    			q=new Trie;
    			if(i==len-1)
    			{
    				q->cnt=jj;
    			}
    			for(j=0;j<26;j++)
    			 	q->next[j]=NULL;
    			p->next[id]=q;
    			
    			p=p->next[id];
    		}
    		else
    		{
    			if(i==len-1)
    			{
    				p->next[id]->cnt=jj;
    			}
    			p=p->next[id];
    		}
    	}
    }
    int find(char *str)
    {
    	int len,i,j,id;
    	len=strlen(str);
    	Trie *p=&root;
    	for(i=0;i<len;i++)
    	{
    		id=str[i]-'a';
    		if(p->next[id]==NULL)
    		return -1;
    		//printf("%d\n",p->next[id]->cnt);
    		if(i==len-1)
    		{
    			return p->next[id]->cnt; 
    		}
    		p=p->next[id];
    	}
    	return -1;
    }
    int main()
    {
    	char hh[15];
    	char map[15];
    	int io=0;
    	while(true)
    	{
    		char t;
    		if((t=getchar())=='\n')  
    			break;
    		else     
    		{
    			map[0]=t;
    			int i=1;
    			while(true)
    			{
    				t=getchar();
    				if(t==' ')
    				{
    					map[i]='\0';
    					break;
    				}
    				else
    					map[i++]=t;
    			}
    		}
    		strcpy(word[io++],map);
    		scanf("%s",hh);
    		ct(hh,io-1);
    		getchar();
    	}
    	while(scanf("%s",hh)!=EOF)
    	{
    		int xx=find(hh);
    		//printf("%d\n",xx);
    		if(xx==-1)
    		{
    			printf("eh\n");
    		}
    		else
    		{
    			printf("%s\n",word[xx]);
    		}
    	}
    	return 0;
     }

[Waterloo local 2001.09.22]: http://poj.org/searchproblem?field=source&key=Waterloo+local+2001.09.22