review37c.rb

def f1(n)
	n = (n * 3 + 1) / 2 while (n.odd?)
	n /= 2 while (n.even?)
	return n
end

def f2(n)
	return n.odd? ? (n * 3 + 1) / 2 : n / 2

end

def avg(l)
	return 0 if (l.empty?)
	t = 0
	l.each { |x| t += x }
	return t.to_f / l.size
end

def total(l)
	t = 0
	l.each { |x| t += x }
	return t
end

def h(n, l0, l1)
	ns = n.to_s(2)
	nl = ns.length
	l1.concat(ns.split(/0+/).map { |x| x.length.to_f / nl })
	l0.concat([ns.split(/1+/)[1..-1]].compact.flatten.map { |x| x.length.to_f / nl })
	
end


def count(x)
	
	
	n = n1 = x['n']
	l = [n]
	while (n >= n1 && n != 1)
		n = {'packed' => true, 'unpacked' => false}[$w] ? f1(n) : f2(n)
		l << n
	end
	cm = (0...l.size).max_by { |x| l[x] }
	
	l0 = []
	l1 = []

	l[0..cm].each \
	{
		|n|
		h(n, l0, l1)
	}
	return l0, l1
end

def uniq(l)
	
	a = {}
	l.each { |x| a[x['n']] = x }
	$stderr.puts({'ls1' => l.size, 'ls2' => a.size}.inspect)
	return a.values

end


# $w = 'packed'
$w = 'unpacked'

l = uniq(File.open('tmp/mixdb.txt').readlines.map { |x| Kernel.eval(x) })

j = 0
at = {}
l = l.sort_by { |x| x['cm'] }.reverse


c = 500

c.times \
{
	|i|
	
	j = (i.to_f / (c - 1) * (l.size - 1)).to_i
	l0, l1 = count(l[j])

	l1.sort!
	l1 = l1.select { |x| x >= 1.0 / 8 }
	
	l1.each_with_index \
	{
		|y, x|
		puts([x.to_f / (l1.size - 1), y, c - i].join("\t"))
	}
	puts
}