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Detecting a cycle L Detecting a cycle L p Detecting a cycle L p stack Detecting a cycle L p stack Detecting a cycle L p Detecting a cycle p Cycle detected at p L Now restore the list using the saved pointers p L Restoring . . . L p Restoring . . . L p Restoring . . .

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slide6

Detecting a cycle

p

Cycle detected at p

L

slide14

How much time and space?

O(N)time

p

L

O(N)space for stack

slide48

How much time and space?

O(1)space

O(N)time