Sha256: a384d9eeee8e50a6a6344ffa57ab14988cd2464f750a0934a230a4d3f30ae2c8
Contents?: true
Size: 140 Bytes
Versions: 7
Compression:
Stored size: 140 Bytes
Contents
class Integer
def subfactorial
zero? ? 1 : self * (self - 1).subfactorial + (-1)**self
end
alias :derangements :subfactorial
end
Version data entries
7 entries across 7 versions & 1 rubygems