Ancient Printer 字典树 hdu 3460

Ancient Printer

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/65536 K (Java/Others)
Total Submission(s): 466    Accepted Submission(s): 224

Problem Description

The contest is beginning! While preparing the contest, iSea wanted to print the teams' names separately on a single paper.
Unfortunately, what iSea could find was only an ancient printer: so ancient that you can't believe it, it only had three kinds of operations:

● 'a'-'z': twenty-six letters you can type
● 'Del': delete the last letter if it exists
● 'Print': print the word you have typed in the printer

The printer was empty in the beginning, iSea must use the three operations to print all the teams' name, not necessarily in the order in the input. Each time, he can type letters at the end of printer, or delete the last letter, or print the current word. After printing, the letters are stilling in the printer, you may delete some letters to print the next one, but you needn't delete the last word's letters.
iSea wanted to minimize the total number of operations, help him, please.

 

 

Input

There are several test cases in the input.

Each test case begin with one integer N (1 ≤ N ≤ 10000), indicating the number of team names.
Then N strings follow, each string only contains lowercases, not empty, and its length is no more than 50.

The input terminates by end of file marker.

 

 

Output

For each test case, output one integer, indicating minimum number of operations.

 

 

Sample Input

   
   
   
   

    
    
    
    2
freeradiant
freeopen
   
   
   
   

 

 

Sample Output

   
   
   
   

    
    
    
    21

    
    
    
    
 
     
 
      Hint 
     
The sample's operation is: f-r-e-e-o-p-e-n-Print-Del-Del-Del-Del-r-a-d-i-a-n-t-Print 
    
    
    
    
     
   
   
   
   

 

 

Author

iSea @ WHU

 

 

Source

2010 ACM-ICPC Multi-University Training Contest（3）——Host by WHU

 

 

Recommend

zhouzeyong

字典树：

遍历所有节点，个数*2，再减去最长的一条链。

#include<iostream> #include<stdlib.h> #include<string.h> using namespace std; struct dictree { struct dictree *child[26]; int n; }; struct dictree *root; void insert(char *source) { int len,i,j; struct dictree *current,*newnode; len=strlen(source); if(len==0) return ; current=root; for(i=0;i<len;i++) { if(current->child[source[i]-'a']!=0) { current=current->child[source[i]-'a']; current->n++; } else { newnode=(struct dictree *)malloc(sizeof(struct dictree)); for(j=0;j<26;j++) newnode->child[j]=0; current->child[source[i]-'a']=newnode; current=newnode; current->n=1; } } } int num=0; int traversal(dictree * t) { int i; struct dictree *current=t; for(i=0;i<26;i++) { if(t->child[i]==0) continue; num++; traversal(t->child[i]); } return num; } int n; int main() { char temp[51]; int i,j; while(cin>>n) { root=(struct dictree *)malloc(sizeof(struct dictree)); root->n=2; for(i=0;i<26;i++) root->child[i]=0; int tt=n; getchar(); int maxn=-1; while(n--) { gets(temp); int len=strlen(temp); if(len>=maxn) maxn=len; insert(temp); } num=0; cout<<traversal(root)*2-maxn+tt<<endl; } }