poj2503Babelfish

#include <iostream>
#include <cstring>
#include <cstdio>
#include <cstdlib>
using namespace std;
const int N=200005;//空间开大了
int chd[N][26];//存储节点编号
char v[N][26];//串尾节点标记//对于map<string,int>为int v[][]
int ID[128];//每个字母的ID
int sz;//节点数
void init(){
    memset(chd, 0, sizeof(chd));
    memset(v, 0, sizeof(v));
    sz= 1;
    for (int i = 0; i < 26; i++)
        ID[i + 'a'] = i;
}
void insert(char *s,char *w){//as map<string string>
    int cur=1;
    for(int i=0;s[i];++i){
        if(!chd[cur][ID[s[i]]])
            chd[cur][ID[s[i]]]=++sz;
        cur=chd[cur][ID[s[i]]];
    }
    strcpy(v[cur],w);
}
/*相当于map<string,int>
void insert(char *s, intw) {
intcur = 1;
for (inti= 0; s[i]; i++) {
if (!chd[cur][ID[s[i]]])
chd[cur][ID[s[i]]] = ++sz;
cur = chd[cur][ID[s[i]]];
}
v[cur] = w;
}
*/
int query(char *s){
    int cur=1;
    for(int i=0;s[i];++i){
        if(!chd[cur][ID[s[i]]])
            return -1;
        cur=chd[cur][ID[s[i]]];
    }
    return cur;
}
int main()
{
    char a[30],b[30],tmp[30];
    init();
    while(gets(tmp)&&tmp[0]!='\0'){//读入问题,才发现基础差的要命
            sscanf(tmp,"%s %s",a,b);
            insert(b,a);//////////////////////////////////////////////////the foreign string is the key
    }
    while(scanf(" %s",tmp)==1){
    int k=query(tmp);
    if(k==-1)
        printf("eh\n");
    else printf("%s\n",v[k]);
    }
    return 0;
}