banana band bee absolute acm ba b band abc
2 3 1 0
#include <iostream>
#include <cstdio>
#include <cstring>
#include <vector>
#include <string>
#include <algorithm>
#include <queue>
using namespace std;
const int maxn = 500000;
int ch[maxn][26];
int cnt;
int val[maxn];
inline int getIdx(char a){
return a-'a';
}
void init(){
memset(ch[0],0,sizeof ch[0]);
cnt = 1;
memset(val,0,sizeof val);
}
void insert(string st){
int u = 0;
for(int i = 0; i < st.size(); i++){
int k = getIdx(st[i]);
if(!ch[u][k]){
ch[u][k] = cnt;
val[cnt]++;
cnt++;
}else{
val[ch[u][k]]++;
}
u = ch[u][k];
}
}
int query(string st){
int u = 0;
for(int i = 0; i < st.size(); i++){
int k = getIdx(st[i]);
if(!ch[u][k]) return 0;
u = ch[u][k];
}
return val[u];
}
int main(){
string st;
init();
while(getline(cin,st)&&st.size()){
insert(st);
}
while(cin >> st){
cout<<query(st)<<endl;
}
return 0;
}
HDOJ1251-统计难题(trie树入门),布布扣,bubuko.com
原文:http://blog.csdn.net/mowayao/article/details/32340263