CAM5  prayatna PR
help the Prayatna pr team
Well, the annual technical symposium of Department of Computer Technology is around the corner. All that we need, to make it a grand success is Publicity among the peer groups ( ofCourse the sponsors too :P ). We decided to share the job between the student groups. As per the plan we decided to meet people in person and influence them to attend Prayatna. But to meet them we have to go to various student groups. To do so, we had to cut our classes. But being studious. students refused to cut more classes. Instead of meeting every one in person we decided to meet few people such that the person to whom we pass the news will spread it to all his friends. And those friends will pass it to other friends and so on. Your task is to find the number of people to be met by the organizers to spread the news.
Caution: Large I/O
Input
First line of input is 't'  Test cases. Follwed by N, the number of peers in the testcase ( 0 to N1 ). followed by the number of friend description 'e'. Following are 'e' descriptions of type "a b" denoting 'a' friends with 'b'. If 'a' is friends with 'b' then 'b' is friends with 'a'.
Output
Output contains t line, the number of people, the organizers have to meet in person for each test case.
Example
Input: 2 4 2 0 1 1 2 3 0 Output: 2 3
Explanation
case 1 : 0 is friends with 1; 1 is friends with 2; so if we pass the news to 0 & 3, news will pass it to the entire N peers.
case 2 : no one is friends with any one. So we have to meet every one in person.
Constraints
t = 10
2 <= N <= 100000
0 <= e <= N/2
hide comments
Divyam Shah:
20171225 11:47:14
Same Logic


striver_79:
20171021 23:56:44
Ac in one go! in 1 minute :P 

vibhanshu_26:
20171002 07:08:51
silly mistake costed me a WA


jayharsh:
20170822 20:15:22
AC in one Go...0.14 sec......DFS is enough.! 

aditya9125:
20170722 10:55:24
used Disjoint set (0.03 secs) 

ani_geek9654:
20170713 12:19:55
AC IN 1GO


rohit9934:
20170630 20:50:13
Clear the vector in each TC, otherwise WA.


imsaral:
20170621 22:31:21
My first Graph Question


ayushagg31:
20170613 13:41:17
just count the connecting components and you are good to go!!!


Siddharth:
20170409 08:42:57
AC code with C++ is WA with python. 
Added by:  karthikeyan 
Date:  20120111 
Time limit:  1s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: ASM64 
Resource:  own problem 