GYM 101673E(暴搜预处理)

1.不会超过500个不同的串……
2.样例没给has到has是怎么样的,实测是true。
3.记忆化别剪错枝就好,嘤嘤嘤……

const int maxn = 505 + 5;
int n, m, tot;
string s, op, t;
bool can[maxn][maxn][2], used[maxn][2];
map<string, int> id;

void GetId(string s) {
	if (!id[s])	id[s] = ++tot;
}

void dfs(int f, int cur, int op) {
	if (used[cur][op])	return;
	used[cur][op] = can[f][cur][op] = 1;

	rep(i, 1, tot) {
		if (can[cur][i][0])	dfs(f, i, op);
		if (can[cur][i][1])	dfs(f, i, 1);
	}
}

int main() {
	ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);

	cin >> n >> m;
	rep(i, 1, n) {
		cin >> s >> op >> t;
		GetId(s), GetId(t);
		can[id[s]][id[t]][op[0] != 'i'] = 1;
	}

	rep(i, 1, tot) {
		init(used, 0);
		dfs(i, i, 0);
	}

	rep(i, 1, m) {
		cin >> s >> op >> t;
		cout << "Query " << i << ": ";
		cout << (can[id[s]][id[t]][op[0] != 'i'] ? "true" : "false") << endl;
	}

	return 0;
}
原文地址:https://www.cnblogs.com/AlphaWA/p/10671526.html