Online Judge	Problem Set	Authors	Online Contests	User
Web Board Home Page F.A.Qs Statistical Charts	Problems Submit Problem Online Status Prob.ID:	Register Update your info Authors ranklist	Current Contest Past Contests Scheduled Contests Award Contest	User ID: Password:   Register

Input :
6
1 -1
2 3 4 -1
2 3 -1
1 3 -1
2 4 -1
5 6 -1
Output:
1 2 6
有一部分人的代码会输出:
1 2 3 5

Home Page   Go Back  To top

All Rights Reserved 2003-2013 Ying Fuchen,Xu Pengcheng,Xie Di
Any problem, Please Contact Administrator