superpollo wrote:
superpollo ha scritto:
Peter Otten ha scritto:
superpollo wrote:
goal (from e.c.m.): evaluate
1^2+2^2+3^2-4^2-5^2+6^2+7^2+8^2-9^2-10^2+...-2010^2, where each three
consecutive + must be followed by two - (^ meaning ** in this context)
from itertools import cycle, izip
sum(sign*i*i for sign, i in izip(cycle([1]*3+[-1]*2), range(1,
2011)))
536926141
don't understand it bit i like this a lot!
^^^
*but*
Works for women as well, we don't understand them, yet we love them ;)
JM
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