TOUR  Fake tournament
We consider only special type of tournaments. Each tournament consists of a series of matches. We have n competitors at the beginning of a competition and after each match the loser is moved out of the competition and the winner stays in (there are no draws).
The tournament ends when there is only one participant left  the winner.
It is a task of National Sports Federation to schedule the matches.
Members of this committee can pick the contestants for the first match. Then, after they know the result, they say which of the remaining contestants meet in the second match,
and so on until there is only one participant left.
It is easy to see that not only skill and training decides about the win, but also
"luck"  i.e. the schedule. The members of NSF know it as well.
The committee used the training time to look carefully on the performance of each probable contestant. It is clear now, at the start of the season, that some of the results between the competitors are 100% predictable. Having this information
NSF considers if it is possible to schedule the matches in such a way that the given contestant x wins. That is to plan the matches for x only with those who will lose with him (then he wins the whole tournament of course).
If it is possible then w say that the tournament can be set for x.
Task
Your task is to write a program which determines the number of contestants of a given tournament for which it is possible to set it.
Input
t [number of tests to solve].
In the first line of each test:
n (1<=n<=1000)  the number of participants of the tournament. We number the participants with numbers 1,2, ... ,n.
The following line contains a list of participants who will inevitably win with participant 1. This list begins with a number m (the number of contestants "better" than 1) and numbers n_{1},n_{2}, ... , n_{m}
delimited by single spaces.
Next n1 lines contain analogous lists for participants 2, 3, ..., n.
Remark 1. The fact that participant a would lose with b and b
would lose with c doesn't necessarily mean that a would lose with c in a direct match.
Remark 2. It is not possible that a is on the list of contestants better than b and b is on the list of a at the same time.
Output
For each test your program should output a single integer  the number of participants, for which it is possible to set the tournament.
Example
Input: 1 3 2 3 2 1 3 0 Output: 1
hide comments
tejasprince:
20181125 06:26:06
Solved using SCC. Do remember that if there are more than 1 SCC with nobody defeating it, then the answer is 0. 

aced:
20181024 10:37:43
1


shubham_04_04:
20180908 18:36:06
Done Dana Done Last edit: 20180908 18:49:48 

nikhil2504:
20180723 15:42:10
Comments are misleading! 

aman_sachin200:
20180611 22:43:37
Awesome One!!!Clears concepts of SCC!! :P Last edit: 20180611 22:44:09 

chinmay0906:
20170816 08:10:57
Try in O(n) with scc 

steady_bunny:
20170614 13:48:58
Try to solve it through SCC !!! Last edit: 20170614 16:17:20 

skr2538:
20170331 11:59:48
@shady .here it can be fixed for 1,2 and 5 

Madcannibal:
20170224 17:25:54
We can calculate array reachs[] (contain how many node can reach me in dfs) in O(n^2) by doing dfs n times, and the answer be the number of i that reachs[i] equal n. 

gaurav_07:
20161012 16:24:04
No need for SCC 
Added by:  Adam Dzedzej 
Date:  20040608 
Time limit:  1s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All 
Resource:  Internet Contest Pogromcy AlgorytmÃ³w (Algorithm Tamers) Round IV, 2001 