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For challenges involving doing something on the bit level.

2
votes
beginning. It uses no libraries. It works by converting the input file to a gigantic n-bit integer and bitwise ORing with 2**n/(2**17 - 1) == 0b10000000000000000100000000000000001…. …
answered Mar 24 '16 by Anders Kaseorg
8
votes
Python, 20 bytes lambda x:x*2%~-2**32 Bitwise rotation left by 1 bit. …
answered Jun 1 '17 by Anders Kaseorg
29
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x86-64 assembly, 5 4 bytes 0: 97 xchg %eax,%edi 1: d1 c0 rol %eax 3: c3 retq A function using the C calling convention that bitwise rotates its argument left by 1 bit. …
answered Jun 1 '17 by Anders Kaseorg