descore v1.1.0 (2015-01-15T16:11:38Z)
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partial_permutation
des
math
combin
equals to fact(n) / fact(n-k)
pure nothrow
long
partial_permutation
(
long
n
,
long
k
)
out (res) { assert (res >= 0); }
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des
math
combin
functions
combination
fact
partial_permutation
equals to fact(n) / fact(n-k)