There are n stacks of n identical-looking coins. All of the coins in one of these stacks are counterfeit, while all the coins in the other stacks are genuine. Every genuine coin weighs 10 grams; every fake weighs 11 grams. You have an analytical scale that can determine the exact weight of any number of coins. a. Devise a brute-force algorithm to identify the stack with the fake coins and determine its worst-case efficiency class. b. Find a constant time algorithm to identify the stack with the fake coins. Hint: It can be done in only one weighting.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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There are n stacks of n identical-looking coins. All of the coins in one of these stacks are
counterfeit, while all the coins in the other stacks are genuine. Every genuine coin weighs 10
grams; every fake weighs 11 grams. You have an analytical scale that can determine the exact
weight of any number of coins.
a. Devise a brute-force algorithm to identify the stack with the fake coins and determine its
worst-case efficiency class.
b. Find a constant time algorithm to identify the stack with the fake coins. Hint: It can be
done in only one weighting.
Transcribed Image Text:There are n stacks of n identical-looking coins. All of the coins in one of these stacks are counterfeit, while all the coins in the other stacks are genuine. Every genuine coin weighs 10 grams; every fake weighs 11 grams. You have an analytical scale that can determine the exact weight of any number of coins. a. Devise a brute-force algorithm to identify the stack with the fake coins and determine its worst-case efficiency class. b. Find a constant time algorithm to identify the stack with the fake coins. Hint: It can be done in only one weighting.
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