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In divide and conquer, the time is taken for merging the subproblems is?

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in Data Structures & Algorithms II by (111k points)
In divide and conquer, the time is taken for merging the subproblems is?

(a) O(N)

(b) O(N log N)

(c) O(N^2)

(d) O(log N)

I got this question in quiz.

My doubt stems from Computational Geometry topic in division Computational Geometry of Data Structures & Algorithms II

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Right answer is (b) O(N log N)

Easiest explanation - The time taken for merging the smaller subproblems in a divide and conquer approach is mathematically found to be O(N log N).

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