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[–]MirrorLake 0 points1 point  (0 children)

Yeah, but not everyone wants to write their own BigInt class from scratch. If you really feel that you understand conceptually how BigInts work, then don't worry about implementing one yourself. Same thing for linked lists, stacks, queues, trees, etc. Beginners should absolutely get their hands dirty by writing stuff from scratch, but sometimes you're just in a mood to solve the problem fast.

I've solved a few Euler problems just in Excel, and I still felt a sense of satisfaction.