Chapter 1: Q12E (page 48)
What is ?
Short Answer
The solution is .
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Chapter 1: Q12E (page 48)
What is ?
The solution is .
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Show that
(Hint: To show an upper bound, compare with . To show a lower bound, compare it with ).
Calculate using any method you choose. (Hint: 127 is prime.)
Give a polynomial-time algorithm for computing, given a,b,c, and prime p.
The grade-school algorithm for multiplying two n-bit binary numbers x and y consist of addingtogethern copies of r, each appropriately left-shifted. Each copy, when shifted, is at most 2n bits long.
In this problem, we will examine a scheme for adding n binary numbers, each m bits long, using a circuit or a parallel architecture. The main parameter of interest in this question is therefore the depth of the circuit or the longest path from the input to the output of the circuit. This determines the total time taken for computing the function.
To add two m-bit binary numbers naively, we must wait for the carry bit from position i-1before we can figure out the ith bit of the answer. This leads to a circuit of depth. However, carry-lookahead circuits (seewikipedia.comif you want to know more about this) can add indepth.
Compute two different ways: by finding the factorization of each number, and by using Euclid’s algorithm.
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