Ancient Printer[HDU3460]

Ancient Printer

Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 131072/65536 K (Java/Others)
Total Submission(s): 1803 Accepted Submission(s): 887

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

#include <stdio.h>
#include <string.h>
class Trie {
#define Trie_MAX_Letter_Num 26
public:
    Trie * next[Trie_MAX_Letter_Num];
    Trie * father;
    int cnt, mark;
    Trie() {
        cnt = 26;
        memset(next, NULL, sizeof(next));
        father = NULL;
        mark = 0;
    }
    void reset() {
        for (int i = 0; i < cnt; i++) {
            if (next[i] != NULL) {
                next[i]->reset();
            }
            delete next[i];
        }
        mark = false;
    }
    void Insert(char * ptr) {
        Trie * root = this;
        while (*ptr != '') {
            if (root->next[(*ptr) - 'a'] == NULL) {
                root->next[(*ptr) - 'a'] = new Trie;
                (root->next[(*ptr) - 'a'])->father = root;
            }
            root = (root->next[(*ptr) - 'a']);
            ptr++;
        }
        root->mark++;
    }
    bool Delete(char * ptr) {
        Trie * root = this;
        while (*ptr != '') {
            if (root->next[(*ptr) - 'a'] == NULL) {
                return false;
            }
            root = (root->next[(*ptr) - 'a']);
            ptr++;
        }
        root->mark--;
        return true;
    }
    Trie * Search(char * ptr) {
        Trie * root = this;
        while (*ptr != '') {
            if (root->next[(*ptr) - 'a'] == NULL) {
                return NULL;
            }
            root = (root->next[(*ptr) - 'a']);
            ptr++;
        }
        return root;
    }
};
Trie * trie;
char str[100];
int dfs(Trie * trie) {
    int ret = trie->mark;
    for (int i = 0; i < 26; i++) {
        if (trie->next[i] == NULL) {
            continue;
        }
        ret = ret + 2 + dfs(trie->next[i]);
    }
    return ret;
}
int dep(Trie * trie) {
    int ret = 0, tmp;
    for (int i = 0; i < 26; i++) {
        if (trie->next[i] == NULL) {
            continue;
        }
        tmp = dep(trie->next[i]);
        if (ret < tmp) {
            ret = tmp;
        }
    }
    return ret + 1;
}
int main() {
    int n;
    while (scanf("%d", &n) != EOF) {
        trie = new Trie;
        for (int i = 0; i < n; i++) {
            scanf("%s", str);
            str[strlen(str)] = '';
            trie->Insert(str);
        }
        printf("%d
", dfs(trie) - dep(trie) + 1);
        trie->reset();
    }
    return 0;
}