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For challenges with a restriction placed on the amount of memory that can be allocated. This can be through direct limits (e.g. 64 bytes) or through big-O-notation (e.g. O(n log(n))).

10 votes
Accepted

Finding duplicate balls in a basket?

Python - 17 chars Solely as an expression: min(B,key=B.count) Full, standalone program with input and output, 34 chars: B=input() print min(B,key=B.count) edit: What gnibbler said.
daniero's user avatar
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3 votes

Count up forever

dc, 12 bytes Uses an "anonymous" recursive macro, should be able to run for ever: z[r1+prdx]dx
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8 votes

Count up forever

Ruby, 15 12 bytes loop{p$.+=1} p, when given an integer, prints the integer as-is (courtesy of @philomory) $. is a magical variable holding the number of lines read from stdin. It is obviously ini …
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