动态字典树_字串查找匹配(HDU_1075)

#include <stdio.h>
#include <string.h>

#define M 3002
#define MU 26
#define WLEN 12

struct node{
    char to[WLEN];
    node *child[MU];
    node()
    {
        to[0] = '';
        memset(child,NULL,sizeof(child));
    }
};

char getTr[M],findEd[WLEN];

void clear(node *root)
{
    for(int i=0;i<MU;i++)
    {
        if(root->child[i] != NULL)
            clear(root->child[i]);
    }
    delete root;
}

void insert(node *root, char *str, char *to)
{
    node *p = root;
    int len = strlen(str);
    for(int i=0; i<len; i++)
    {
        int k = str[i] - 'a';
        if(p->child[k] == NULL)
        {
            p->child[k] = new node;
        }
        p = p->child[k];
    }
    strcpy(p->to,to);
}

void find(node *root, char *str)
{
    node *p = root;
    int len = strlen(str);
    for(int i=0; i<len; i++)
    {
        int k = str[i] - 'a';
        if(p->child[k] == NULL)
            return ;
        p = p->child[k];
    }
    strcpy(findEd,p->to);
}

bool isChar(char ch)
{
    if(ch >= 'a' && ch <= 'z')    return true;
    return false;
}

void run()
{
    node *root = new node;
    char s1[WLEN],s2[WLEN];
    scanf("%s",s1);
    while(scanf("%s",s1))
    {
        if(!strcmp(s1,"END"))    break;
        scanf("%s",s2);
        insert(root,s2,s1);
    }
    
    scanf("%s",s1);
    getchar();
    while(gets(getTr))
    {
        if(!strcmp(getTr,"END"))    break;
        int j = 0;
        int len = strlen(getTr);
        for(int i=0; i<len; i++)
        {
            if(isChar(getTr[i]))
            {
                s2[j++] = getTr[i];
            }
            else
            {
                s2[j] = '';
                findEd[0] = '';
                find(root,s2);
                if(findEd[0] != '')    printf("%s",findEd);
                else                printf("%s",s2);
                printf("%c",getTr[i]);
                j = 0;
            }
        }
        printf("
");
    }
    clear(root);
}

int main(int argc, char *argv[])
{
#ifdef __MYLOCAL
    freopen("in.txt","r",stdin);
#endif
    
    run();
    
    return 0;
}