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If the elements “A”, “B”, “C” and “D” are placed in a stack and are deleted one at a time, what is the order of removal?

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If the elements “A”, “B”, “C” and “D” are placed in a stack and are deleted one at a time, what is the order of removal?

(a) ABCD

(b) DCBA

(c) DCAB

(d) ABDC

This intriguing question comes from Stack Operations in chapter Abstract Data Types of Data Structures & Algorithms I

This question was addressed to me in homework.

1 Answer

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Right choice is (b) DCBA

The explanation is: Stack follows LIFO(Last In First Out). So the removal order of elements are DCBA.

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