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4 billion if statements (andreasjhkarlsson.github.io)

submitted 11 months ago by [email protected] to c/[email protected]

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[–] [email protected] 39 points 11 months ago (2 children)

Could be easily made 50% space saving by only iffin all odds and return even on else. Maybe one if before to handle overflow to avoid wrong even if over the last if.

[–] [email protected] 38 points 11 months ago

Well yeah, if you allow cheating!

[–] [email protected] 18 points 11 months ago* (last edited 11 months ago) (1 children)

Yeah but then ALL even numbers would be slow to compute because you would have to chain through every odd before you know that 2 is even.

Depends on the expected distribution of input values

[–] [email protected] 1 points 11 months ago

Heuristic: keep it until 512, afterwards powers of 2, and numbers like 1000, 2000,.., 10000, 20000,... (regex: [0-9]000+)