Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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8. Suppose you have a stack in which the values 1 through 5 must be pushed on the
stack in that order, but that an item on the stack can be popped and printed at any
time. So for example, the operations
s.push (1)
s.push (2)
print s.pop()
Track 1
FIGURE 7-18
Railroad switching system for Exercise 4
s.push(3)
s.push (4)
print s.pop()
s.push(5)
print s.pop()
print s.pop()
print s.pop()
C. 1 4 35 2
Track 2
Track 3
produce the sequence 2 4 5 3 1. Based on the constraints mentioned above,
give the list of operations that would produce each of the following sequences. If it
is not possible, state so.
a. 1 3 5 4 2
b. 2 3 4 5 1
d. 1 5 4 2 3
e. Are there sequences that cannot occur? Explain why or why not.
Exercises
421
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Transcribed Image Text:8. Suppose you have a stack in which the values 1 through 5 must be pushed on the stack in that order, but that an item on the stack can be popped and printed at any time. So for example, the operations s.push (1) s.push (2) print s.pop() Track 1 FIGURE 7-18 Railroad switching system for Exercise 4 s.push(3) s.push (4) print s.pop() s.push(5) print s.pop() print s.pop() print s.pop() C. 1 4 35 2 Track 2 Track 3 produce the sequence 2 4 5 3 1. Based on the constraints mentioned above, give the list of operations that would produce each of the following sequences. If it is not possible, state so. a. 1 3 5 4 2 b. 2 3 4 5 1 d. 1 5 4 2 3 e. Are there sequences that cannot occur? Explain why or why not. Exercises 421
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