30 lines
886 B
Text
30 lines
886 B
Text
func combos(sides, n) {
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n || return [1]
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var ret = ([0] * (n*sides.max + 1))
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combos(sides, n-1).each_kv { |i,v|
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v && for s in sides { ret[i + s] += v }
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}
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return ret
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}
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func winning(sides1, n1, sides2, n2) {
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var (p1, p2) = (combos(sides1, n1), combos(sides2, n2))
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var (win,loss,tie) = (0,0,0)
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p1.each_kv { |i, x|
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win += x*p2.first(i).sum
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tie += x*p2.slice(i).first(1).sum
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loss += x*p2.slice(i+1).sum
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}
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[win, tie, loss] »/» p1.sum*p2.sum
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}
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func display_results(String title, Array res) {
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say "=> #{title}"
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for name, prob in (%w(p₁\ win tie p₂\ win) ~Z res) {
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say "P(#{'%6s' % name}) =~ #{prob.round(-11)} (#{prob.as_frac})"
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}
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print "\n"
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}
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display_results('9D4 vs 6D6', winning(range(1, 4), 9, range(1,6), 6))
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display_results('5D10 vs 6D7', winning(range(1,10), 5, range(1,7), 6))
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