Problem

A positive integer N is a power if it is of the form qk, where q, k are positive integers...

A positive integer N is a power if it is of the form qk, where q, k are positive integers and k > 1.

(a) Give an efficient algorithm that takes as input a number N and determines whether it is a square, that is, whether it can be written as q2for some positive integer q. What is the running time of your algorithm?


(b) Show that if N = qk (with N, q, and k all positive integers), then either k ≤ log N or N = 1.


(c) Give an efficient algorithm for determining whether a positive integer N is a power. Analyze its running time.

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Solutions For Problems in Chapter 1