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What exactly goes obsolete?

Are trees and graphs suddenly not used anymore? Are loops and folds and calculus invalidated? I harp here once a month about how even senior Google engineers and Amazon principles don't know the optimal asymptotic time complexity for sorting 50m pairs of 32 bit unsigned numbers, as the answer changed substantially earlier this decade.

The humanities are more important than they get credit for, but this argument that everything is invalidated and industry teaches you everything is absurd.



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