trie前缀模板

#include "iostream"

using namespace std;

const int maxn = 1000010, maxm = 500010;

int n, m;
int son[maxm][26], cnt[maxn], idx;
char str[maxn];

void insert() {
    int p = 0;
    for(int i = 0; str[i]; ++i) {
        int &s = son[p][str[i] - 'a'];
        if(!s) s = ++idx;
        p = s;
    }
    cnt[p]++;
}

int query() {
    int p = 0, res = 0;
    for(int i = 0; str[i]; ++i) {
        int &s = son[p][str[i] - 'a'];
        if(!s) break;
        p = s;
        res += cnt[p];
    }
    return res;
}

int main() {
    scanf("%d%d", &n, &m);
    for(int i = 1; i <= n; ++i) {
        scanf("%s", str);
        insert();
    }
    for(int i = 1; i <= m; ++i) {
        scanf("%s", str);
        cout << query() << endl;
    }
    
    
    return 0;
}