ZOJ3960-What Kind of Friends Are You?

What Kind of Friends Are You?

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Time Limit: 1 Second      Memory Limit: 65536 KB

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Japari Park is a large zoo home to extant species, endangered species, extinct species, cryptids and some legendary creatures. Due to a mysterious substance known as Sandstar, all the animals have become anthropomorphized into girls known as Friends.

Kaban is a young girl who finds herself in Japari Park with no memory of who she was or where she came from. Shy yet resourceful, she travels through Japari Park along with Serval to find out her identity while encountering more Friends along the way, and eventually discovers that she is a human.

However, Kaban soon finds that it's also important to identify other Friends. Her friend, Serval, enlightens Kaban that she can use some questions whose expected answers are either "yes" or "no" to identitfy a kind of Friends.

To be more specific, there are n Friends need to be identified. Kaban will ask each of them q same questions and collect their answers. For each question, she also gets a full list of animals' names that will give a "yes" answer to that question (and those animals who are not in the list will give a "no" answer to that question), so it's possible to determine the name of aFriends by combining the answers and the lists together.

But the work is too heavy for Kaban. Can you help her to finish it?

Input

There are multiple test cases. The first line of the input is an integer T (1 ≤ T ≤ 100), indicating the number of test cases. Then T test cases follow.

The first line of each test case contains two integers n (1 ≤ n ≤ 100) and q (1 ≤ q ≤ 21), indicating the number of Friends need to be identified and the number of questions.

The next line contains an integer c (1 ≤ c ≤ 200) followed by c strings p₁, p₂, ... , p_c (1 ≤ |p_i| ≤ 20), indicating all known names of Friends.

For the next q lines, the i-th line contains an integer m_i (0 ≤ m_i ≤ c) followed by m_i strings s_{i, 1}, s_{i, 2}, ... , s_i, mi (1 ≤ |s_i, j| ≤ 20), indicating the number of Friends and their names, who will give a "yes" answer to the i-th question. It's guaranteed that all the names appear in the known names of Friends.

For the following n lines, the i-th line contains q integers a_{i, 1}, a_{i, 2}, ... , a_i, q (0 ≤ a_i, j ≤ 1), indicating the answer (0 means "no", and 1 means "yes") to the j-th question given by the i-thFriends need to be identified.

It's guaranteed that all the names in the input consist of only uppercase and lowercase English letters.

Output

For each test case output n lines. If Kaban can determine the name of the i-th Friends need to be identified, print the name on the i-th line. Otherwise, print "Let's go to the library!!" (without quotes) on the i-th line instead.

Sample Input

23 45 Serval Raccoon Fennec Alpaca Moose4 Serval Raccoon Alpaca Moose1 Serval1 Fennec1 Serval1 1 0 10 0 0 01 0 0 05 511 A B C D E F G H I J K3 A B K4 A B D E5 A B K D E10 A B K D E F G H I J4 B D E K0 0 1 1 11 0 1 0 11 1 1 1 10 0 1 0 11 0 1 1 1

Sample Output

ServalLet's go to the library!!Let's go to the library!!Let's go to the library!!Let's go to the library!!BLet's go to the library!!K

Hint

The explanation for the first sample test case is given as follows:

As Serval is the only known animal who gives a "yes" answer to the 1st, 2nd and 4th question, and gives a "no" answer to the 3rd question, we output "Serval" (without quotes) on the first line.

As no animal is known to give a "no" answer to all the questions, we output "Let's go to the library!!" (without quotes) on the second line.

Both Alpaca and Moose give a "yes" answer to the 1st question, and a "no" answer to the 2nd, 3rd and 4th question. So we can't determine the name of the third Friends need to be identified, and output "Let's go to the library!!" (without quotes) on the third line.

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Author: DAI, Longao
Source: The 14th Zhejiang Provincial Collegiate Programming Contest Sponsored by TuSimple

题意：有n个人，m个问题，给出m个问题回答yes的人的名字，有q个询问，给出一个人对m个问题的回答，问在n个人是否有唯一的这样的人，有则输出名字，有多个或没有输出Let's go to the library!!

解题思路：状态压缩，算出每个人m道题回答的结果

#include <iostream>#include <cstdio>#include <cstring>#include <string>#include <algorithm>#include <cmath>#include <map>#include <set>#include <stack>#include <queue>#include <vector>#include <bitset>using namespace std;#define LL long longconst int INF = 0x3f3f3f3f;int q, m, n;string s,ss[205];int a[4000009];int main(){int t;scanf("%d", &t);while (t--){map<string, int>mp;memset(a, 0, sizeof a);scanf("%d%d", &q, &m);scanf("%d", &n);for (int i = 1; i <= n; i++){cin >> s;mp[s] = i;ss[i] = s;}for (int i = 0; i < m; i++){int k;scanf("%d", &k);for (int j = 0; j < k; j++){cin >>s;int kk = mp[s];a[kk] |= (1 << i);}}while (q--){int k = 0,x;for (int i = 0; i < m; i++){scanf("%d", &x);if (x == 1) k |= (1 << i);}int ans = -1;for (int i = 1; i <= n; i++){if (k == a[i]){if (ans == -1) ans = i;else { ans = -1; break; }}}if (ans == -1) printf("Let's go to the library!!\n");else cout << ss[ans] << endl;}}return 0;}