学步园

http://hihocoder.com/problemset/problem/1014

#include <stdio.h>
#include <stdlib.h>
#define MAX 26


typedef struct TNode
{
int count;
struct TNode *head;
struct TNode *tail;
struct TNode *next;
char value;
}Node;


Node* newNode(char ch)
{
Node *node = (Node*)malloc(sizeof(Node));
node->count = 0;
node->head = NULL;
node->tail = NULL;
node->next = NULL;
node->value = ch;
return node;
}


Node* search(char ch, Node * trie)
{
        
        while(trie)
{
if(ch == trie->value)
return trie;
trie = trie->next;
}
       return NULL;
}




void buildTrie(char *s, Node *trie)
{
int n = strlen(s);
Node* node = search(s[0], trie->head);
if(node == NULL){
node = newNode(s[0]); 
if(trie->head == NULL)
trie->head = trie->tail = node;
else
{trie->tail->next = node;trie->tail = node;}
}
node->count++;
if(n>1)
buildTrie(s+1, node);
}


int matchCount(char *s , Node * trie)
{
int n = strlen(s);
Node* node = search(s[0], trie->head);
if(node == NULL) return 0;
if(n>1)
return matchCount(s+1,node);
return node->count;
}


int getRoot(Node* trie[], char *s)
{
int i;
for(i=0;i<26;i++)
if(trie[i]==NULL)
return i;
else if(trie[i]->value == s[0])
return i;
}


void init(Node *trie[])
{
int i;
for(i=0;i<26;i++)
trie[i] = NULL;
}


int main()
{
int m,n,i;
char s[11];
scanf("%d",&m);
Node *trie[26];
init(trie);
for(i=0;i<m;i++)
{
scanf("%s",s);
int index = getRoot(trie,s);
if(trie[index] == NULL)
trie[index] = newNode(s[0]);
trie[index]->count++;
if(strlen(s)>1)
buildTrie(s+1,trie[index]);
}
scanf("%d",&n);
int count;
for(i=0;i<n;i++)
{
count = 0;
scanf("%s",s);
int index = getRoot(trie,s);
if(strlen(s)==1)
if(trie[index] != NULL) count = trie[index]->count; 
if(strlen(s) > 1)
count = matchCount(s+1,trie[index]);
printf("%d\n",count);
}
return 0;
}