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September Morn Update

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This commit is contained in:
Ingy döt Net 2019-09-12 10:33:56 -07:00
parent 4e2d22a71d
commit aac6731f2c
6856 changed files with 141342 additions and 21127 deletions
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14
Task/Evaluate-binomial-coefficients/Python/evaluate-binomial-coefficients-2.py
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@ -1,4 +1,7 @@
from operator import mul
from functools import reduce
def comb(n,r):
''' calculate nCr - the binomial coefficient
>>> comb(3,2)
@ -11,7 +14,10 @@ def comb(n,r):
38760
'''
if r > n-r: # for smaller intermediate values
r = n-r
return int( reduce( mul, range((n-r+1), n+1), 1) /
reduce( mul, range(1,r+1), 1) )
if r > n-r:
# r = n-r for smaller intermediate values during computation
return ( reduce( mul, range((n - (n-r) + 1), n + 1), 1)
// reduce( mul, range(1, (n-r) + 1), 1) )
else:
return ( reduce( mul, range((n - r + 1), n + 1), 1)
// reduce( mul, range(1, r + 1), 1) )