Two friends are exchanging messages through regular post mail. They don't want anyone to understand their messages in case anyone read them. The messages are in the form of an array of characters, where each character has a numeric value as illustrated in the below lookup table. ABCDE 1 2 3 4 FG JKLM 7 8| 9 10 11 12 13 RS TUV 14 15 16 17 18 19 20 21 22 23 24 25 26 NOPQ W xY They decided to change the characters in the array in a way that cannot be observed by any accidental reading. They do so as follows: 1- Given the original message, for example: GREETINGS 2- transform the original character to its numeric value 7 18 5 5 20 9 14 7 19 3- For each number, subtracting from its value the value of the first lower value character after it, and if there's no such character they will keep that character without any change. 2 12 55 11 2 77 19

Two friends are exchanging messages through regular post mail. They don't want anyone to understand their messages in case anyone read them. The messages are in the form of an array of characters, where each character has a numeric value as illustrated in the below lookup table. ABCDE 1 2 3 4 FG JKLM 7 8| 9 10 11 12 13 RS TUV 14 15 16 17 18 19 20 21 22 23 24 25 26 NOPQ W xY They decided to change the characters in the array in a way that cannot be observed by any accidental reading. They do so as follows: 1- Given the original message, for example: GREETINGS 2- transform the original character to its numeric value 7 18 5 5 20 9 14 7 19 3- For each number, subtracting from its value the value of the first lower value character after it, and if there's no such character they will keep that character without any change. 2 12 55 11 2 77 19

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

Section: Chapter Questions

Problem 1PE

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Question

2 12 5 5 11 2 7 7 19
Explanation
Step by step
7 18 5 5 20 9 14 7 19
7 18 55 20 9 14 7 19
7 (18 55 20 9 14 7 19
7-5 = 2
18-5 = 12
7 18 5 5 20 9 14 7 19
7 18 5 5 20 9 14 7 19
No smaller after it
No smaller after it
7 18 5 5 20 9 14 7 19
20-9 =11
7 18 5 5 20 (9 14 (7)19
7 18 5 5 20 9 (14 7 19
7 18 5 5 20 9 14 (7) 19
7 18 5 5 20 9 14 7 (19
9-7 = 2
4- Return the
14-7 = 7
corresponding
character for
No smaller after it
No smaller after it
each new
numeric value
BLEEK BGGS
a) Using a brute-force approach, design an algorithm to solve
this problem, and analyze its complexity
b) Implement your algorithm using Python
c) Design a more efficient algorithm to solve this problem, and analyze its
complexity [Hint: you can use any data-structure]
d) Prepare a brief report (250 words) comparing the two algorithms
00

Two friends are exchanging messages through regular post mail. They don't want
anyone to understand their messages in case anyone read them. The messages are in
the form of an array of characters, where each character has a numeric value as
illustrated in the below lookup table.
GHIJ K LM
6 7 8
A BC DE F
1
2
3
4
9 10 11 12 13
QRS
14 15 16 17 18 19 20
N
O P
T
U v
V w X
Y
21 22 23 24 25 26
They decided to change the characters in the array in a way that cannot be observed by
any accidental reading. They do so as follows:
1- Given the original message, for example:
GREETINGS
2- transform the original character to its numeric value
7 18 5 5 20 9 14 7 19
3- For each number, subtracting from its value the value of the first lower value
character after it, and if there's no such character they will keep that character
without any change.
2 12 5 5 11 2 77 19

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