P2922 [USACO08DEC]Secret Message G

目录

• 题目
• 思路
• 代码

题目

传送门

思路

这·是·蓝·题?!

这不是裸的trie吗,感觉最多去到绿色

跟这题几乎一样,甚至更简单,对trie求前缀和即可,水题,不细讲

代码

#include <iostream>
#include <cstdio>
#define nn 1000010
using namespace std;
int read() {
	int re = 0;
	char c = getchar();
	while(c < '0' || c > '9')c = getchar();
	while(c >= '0' && c <= '9')
		re = (re << 1) + (re << 3) + c - '0',
		c = getchar();
	return re;
}
int trie[nn][3] , cnt[nn] , sum[nn];
void insert() {
	int siz = read();
	int p = 1;
	static int top = 1;
	for(int i = 1 ; i <= siz ; i++) {
		int tmp = read();
		if(trie[p][tmp] == 0)
			trie[p][tmp] = ++top;
		p = trie[p][tmp];
	}
	cnt[p]++;
}
void dfs(int p) {
	if(p == 0)return;
	dfs(trie[p][0]);
	dfs(trie[p][1]);
	sum[p] = sum[trie[p][0]] + sum[trie[p][1]] + cnt[p];
}
void query() {
	int res = 0;
	int siz = read();
	int p = 1;
	for(int i = 1 ; i <= siz ; i++) {
		int tmp = read();
		if(p == 0)
			continue;
		res += cnt[p];
		p = trie[p][tmp];
	}
	res = res + sum[p];
//	cout << sum[p] << endl;
	printf("%d
" , res);
	return;
}
int main() {
//	freopen("P2922_2.in" , "r" , stdin);
//	freopen("output.txt" , "w" , stdout);
	int n , m;
	m = read();
	n = read();
	for(int i = 1 ; i <= m ; i++)
		insert();
	dfs(1);
	for(int i = 1 ; i <= n ; i++)
		query();
	return 0;
}