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/**[][]
 1  N  N 



 1  2 
 trust trust[i] = [a, b]  a  b 
 -1

 1
N = 2, trust = [[1,2]]
2

 2
N = 3, trust = [[1,3],[2,3]]
3

 3
N = 3, trust = [[1,3],[2,3],[3,1]]
-1

 4
N = 3, trust = [[1,2],[2,3]]
-1

 5
N = 4, trust = [[1,3],[1,4],[2,3],[2,4],[4,3]]
3
 

1
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