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What is the time complexity of an infix to postfix conversion algorithm?

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What is the time complexity of an infix to postfix conversion algorithm?

(a) O(N log N)

(b) O(N)

(c) O(N^2)

(d) O(M log N)

This is a very interesting question from Application of Stacks in portion Application of Stacks of Data Structures & Algorithms I

This question was addressed to me in unit test.

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Correct choice is (b) O(N)

The best I can explain: The time complexity of an infix to postfix expression conversion algorithm is mathematically found to be O(N).

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