Is It a Tree

Problem Number: 
615
Type of Problem: 
Problem Category: 
Input: 
Critical Input
0
Critical Input: 
6 8 5 3 5 2 6 4 5 6 0 0 6 8 5 3 5 2 6 4 5 6 5 3 0 0 8 1 7 3 6 2 8 9 7 5 7 4 7 8 7 6 0 0 3 8 6 8 6 4 5 3 5 6 5 2 0 0 1 2 3 3 0 0 99006 700002 700002 880002 880002 1000001 1000001 1234567890 1234567890 22 0 0 1 2 2 3 4 3 2 4 0 0 1 2 2 3 4 5 0 0 1 7346537 37542 1 0 0 7 7 0 0 100 1 1 2 9 7 7 3 3 88 88 6 1 9 2 6 0 0 1 2 1 2 0 0 999999 5 0 0 0 0 1 2 2 1 0 0 2 5 5 4 4 3 3 2 2 1 10 11 0 0 -4 -5
Random Input: 
Problem Id: 
615