Recall the Stack ADT. It has the following operations: push(item): adds item to the top of the stack pop) : removes and returns the top item in the stack peek() : returns the top item in the stack (but does NOT remove it) size() : returns the number of items in the queue Write pseudocode for a function called remove(S, item) that takes a stack S and a value called item as input. The function removes all occurrences of item in S and returns the number of occurrences. The order of items in the modified stack must be the same as their original ordering (but with all occurrences of item absent). You can ONLY use basic control flow structures and Stack operations. You can use multiple stacks if you wish. Examples: S:= empty stack S.push('a'), S.push('t'), S.push('a'), S.push('u'), S.push('p') assert: the stack S now looks like ['a', 't', 'a', 'u', 'p'] (where 'p' is the top value) remove(S, 'a') assert: n is 2 assert : the stack S now looks like ['t', 'u', 'p'] (where 'p' is the top value) n = remove(S, 'q') assert: n is 0 and S is unchanged n =

Recall the Stack ADT. It has the following operations: push(item): adds item to the top of the stack pop) : removes and returns the top item in the stack peek() : returns the top item in the stack (but does NOT remove it) size() : returns the number of items in the queue Write pseudocode for a function called remove(S, item) that takes a stack S and a value called item as input. The function removes all occurrences of item in S and returns the number of occurrences. The order of items in the modified stack must be the same as their original ordering (but with all occurrences of item absent). You can ONLY use basic control flow structures and Stack operations. You can use multiple stacks if you wish. Examples: S:= empty stack S.push('a'), S.push('t'), S.push('a'), S.push('u'), S.push('p') assert: the stack S now looks like ['a', 't', 'a', 'u', 'p'] (where 'p' is the top value) remove(S, 'a') assert: n is 2 assert : the stack S now looks like ['t', 'u', 'p'] (where 'p' is the top value) n = remove(S, 'q') assert: n is 0 and S is unchanged n =

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

Recall the Stack ADT. It has the following operations:
push(item): adds item to the top of the stack
pop() : removes and returns the top item in the stack
peek() : returns the top item in the stack (but does NOT remove it)
size() : returns the number of items in the queue
Write pseudocode for a function called remove(S, item) that takes a stack S and a value
called item as input. The function removes all occurrences of item in S and returns the
number of occurrences. The order of items in the modified stack must be the same as their
original ordering (but with all occurrences of item absent). You can ONLY use basic control
flow structures and Stack operations. You can use multiple stacks if you wish.
Examples:
S:= empty stack
S.push('a'), S.push('t'), S.push('a'), S.push('u'), S.push('p')
assert: the stack S now looks like ['a', 't', 'a', 'u', 'p'] (where 'p' is the top value)
n = remove(S, 'a')
assert : n is 2
assert : the stack S now looks like ['t', 'u', 'p'] (where 'p' is the top value)
n = remove(S, 'q')
assert: n is 0 and S is unchanged

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