单选题：The Euler’s circuit problem can be solved in?

The Euler’s circuit problem can be solved in?
@[D](2)

A. O(N)
B. O( N logN)
C. O(log N)
D. O(N2)



A.O(N)
B.O( N logN)
C.O(log N)
D.O(N2)


答案：D