CF1285F Classical?

Given an array $ a $ , consisting of $ n $ integers, find: $ $$$\max\limits_{1 \le i < j \le n} LCM(a_i,a_j), $ $

where $ LCM(x, y) $ is the smallest positive integer that is divisible by both $ x $ and $ y $ . For example, $ LCM(6, 8) = 24 $ , $ LCM(4, 12) = 12 $ , $ LCM(2, 3) = 6$$$.

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