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What is the efficiency of Gale-Shapley algorithm used in stable marriage problem?

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What is the efficiency of Gale-Shapley algorithm used in stable marriage problem?

(a) O(N)

(b) O(N log N)

(c) O(N^2)

(d) O(log N)

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This key question is from Matching in portion Matching of Data Structures & Algorithms II

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Right option is (c) O(N^2)

Easiest explanation - The time efficiency of Gale-Shapley algorithm is mathematically found to be O(N^2) where N denotes stable marriage problem.

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