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Authors:
Anany Levitin
Chapter:
Fundamentals Of The Analysis Of Algorithm Efficiency
Exercise:
2.2 Exercise
Question:12 | ISBN:9780132316811 | Edition: 3

Question

Door in a wallYou are facing a wall that stretches infinitely in both direc-tions. There is a door in the wall, but you know neither how far away nor inwhich direction. You can see the door only when you are right next to it. De-sign an algorithm that enables you to reach the door by walking at most O(n) steps where n is the (unknown to you) number of steps between your initialposition and the door. [Par95]

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