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What is the time complexity of evaluation of postfix expression algorithm?

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What is the time complexity of evaluation of postfix expression algorithm?

(a) O (N)

(b) O (N log N)

(c) O (N^2)

(d) O (M log N)

Origin of the question is Application of Stacks in portion Application of Stacks of Data Structures & Algorithms I

The question was asked in homework.

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Correct choice is (a) O (N)

The explanation is: The time complexity of evaluation of infix, prefix and postfix expressions is O (N).

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