Ulrich Eckhardt ha scritto:
superpollo wrote:
... s += i**2
... if not (i+1)%5:
... s -= 2*i**2
... if not i%5:
... s -= 2*i**2
if not (i % 5) in [1, 2]:
s += i**2
else:
s -= i**2
Untested code.
does not work:
>>> s = 0
>>> for i in range(1, 2011):
... if not (i % 5) in [1, 2]:
... s += i**2
... else:
... s -= i**2
...
>>> print s
546627205
>>>
but this does:
>>> s = 0
>>> for i in range(1, 2011):
... if i % 5 in [1, 2, 3]:
... s += i**2
... else:
... s -= i**2
...
>>> print s
536926141
bye
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