集训队专题（1）1005 Ancient Printer

Ancient Printer

Time Limit : 2000/1000ms (Java/Other)   Memory Limit : 131072/65536K (Java/Other)

Total Submission(s) : 25   Accepted Submission(s) : 14

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

2freeradiantfreeopen

 

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[/hint]

 

Author

iSea @ WHU

 

Source

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

 

       此题不仅考验大家的输入输出能力，还考验了大家的数学能力（小编我TT）。

       直观是看，不难想到，没有共同前缀的词，肯定必须把整个词删掉重新输入，尔有共同前缀的词，肯定是先输入短的词，再输入长的词最节省步骤。所以，我们需要在输入的时候就找到最长的词，然后最后输入它。

#include<iostream>#include<cstdio>#include<algorithm>#include<cstring>using namespace std;struct node{node *next[26];};node *root;int  Maxsum;void Insert(char *s){    node *p = root;    for(int i=0; s[i]; i++)    {        int k = s[i] - 'a';        if(!p->next[k])        {            p->next[k] = new node();            Maxsum += 2;        }        p = p->next[k];    }}void Free(node *p){    for(int i=0; i<26; i++)        if(p->next[i])Free(p->next[i]);    free(p);}int main(){    int N;    while(scanf("%d",&N)!=EOF)    {        char s[100];        int i,MaxLen = 0;        root = new node();        Maxsum =  N;        for(i=0; i<N; i++)        {            scanf("%s",s);            Insert(s);            int len = strlen(s);            MaxLen = max(MaxLen, len);        }        printf("%d\n", Maxsum - MaxLen);        Free(root);    }    return 0;}