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require 'singleton' class Fact include Singleton def initialize @fact = Hash.new {|h, k| h[k] = k * h[k - 1]} @fact[1] = 1 end def [](n) return 1 if n <= 1 @fact[n] end end class Deck def initialize(seed, size=30) @fact = Fact.instance @seâ¦
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30æãã7æé¸ã¶çµåãã¯ã def nCm(n, m) fact = Fact.new fact[n].div(fact[m] * fact[n - m]) end p nCm(30, 7)
class Fact def initialize @fact = Hash.new {|h, k| h[k] = k * h[k - 1]} @fact[1] = 1 end def [](n) return 1 if n <= 1 @fact[n] end end f = Fact.new p f[5] p f[20]
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