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URL: https://usaco.guide/dashboard/
Module: Solution to Focus problem: GCDEX - GCD Extreme from SPOJ, Module: Divisibility, Section: Gold
Topic: Mistake
Message:
The solution for the focus problem GCD Extreme has a wrong time complexity, which is too slow to pass. Unless I am mistaken, the time complexity given is O(N) per query which is too slow to pass the SPOJ judge. I have verified this by submitting the given solution to SPOJ, and it indeed gives a time limit exceeded ruling. There is a much simpler solution of time complexity of O(N logN) of preprocessing + O(1) per query.