range.rb

#!/usr/bin/ruby1.8
 
def fs()
	
	lo = [lambda { |n| n * 3 + 1 }, lambda { |n| (n * 3 + 1) / 2 }, 
		lambda { |n| n = (n * 3 + 1) / 2 while (n.odd?); n }]
	le = [lambda { |n| n / 2 }, lambda { |n| n /= 2 while (n.even?); n }]


	l = []
	lo.each \
	{ 
		|o, i| 
		le.each \
		{ 
			|e, j| 
			
			next if (o == lo.first && e == le.last)
			
			l << lambda \
			{ 
				|n| 
				n = o.call(n) if (n.odd?)
				n = e.call(n) if (n.even?)
				n
			}
		}
	}

	return l
end

def dense(n)
 
        s = n.to_s(2)
        c = 0
        s.length.times \
        {
                |i|
                c += s[i, 1].to_i
        }
        return c.to_f / s.length
 
end

def widthdiff(x, y)
        x.to_s(2).length - y.to_s(2).length
 
end

def widthratio(x, y)
        x.to_s(2).length.to_f / y.to_s(2).length
end

def f(n, w)
 
        n1 = n
        c = 0
	l = [n]
	cg = nil
	
        while (n != 1)
		n = $f.call(n)

		l << n
                c += 1
	
		cg = c if (cg.nil? && n < n1)

		break if (!cg.nil? && w != 'c')
        end
	cm = (0...l.size).max_by { |x| l[x] }
	
        return {'cm' => cm,
		'cg' => cg.nil? ? 0 : cg, 
		'm' => l[cm].to_s(2).length,
		'w' => widthdiff(l[cm], n1),
		'r' => widthratio(l[cm], n1),
		'c' => l.size,
		'd' => (0.5 - dense(n1)).abs}
 
end

def long(m, w)
 
	return {'n' => rand(2 ** m) | 1 } if (w == 'z')
		
        l = [{'n' => 1, 'p' => 0}.merge(f(1, w))]
        t = 0
	e = 2000
	
        loop \
        {
                l = l.sort_by { |x| [x[w], -x['d']] }.reverse
 
                x = l.delete_at(rand([l.size, 20].min))
 
                p2 = x['p'] + 1
                n2 = x['n'] + 2 ** p2
 
 
                x1 = x.dup
                x1['p'] = p2
                l << x1
 
                x2 = {'n' => n2, 'p' => p2}.merge(f(n2, w))
                l << x2
                t += 1
 
		w2 = w
		if (w == 'r') then
			z = l.sort_by { |x| x['n'] }.reverse[0...100].max_by { |x| x['r'] }
			w2 = 's'
		else
			z = l.max_by { |x| x[w] }
		end
		z.merge!({ 't' => t, 's' => t.to_f / e })
		
                return z if (z[w2] >= m)
		
                return if (t >= e)
        }
 
end

def run1(p, k, m, j)
	
	r = p[k]
	a, b = r
	x = a + m * (b - a)
	z = long(x, k)
	
	s = ns = nil
	if (!z.nil?) then
		s = z['s']
		ns = z['n'].to_s(2).length
	end
	
	$stderr.puts([k, j, r3(m), r3(x), r3(s), ns].inspect)
	return if (z.nil?)
	
	z['x'] = x
	return z
		
end

def r3(x)
	x.nil? ? nil : sprintf("%.3f", x).to_f
end

def test(p, k, j)
	
	$f = $fs[j]
	y = -10
	w = 0.25
	i = 0
	x = nil
	
	loop \
	{
		z = run1(p, k, w, j)
		if (z.nil? || w > 2.0) then
			$stderr.puts('***')
			if (i - y < 10 || w > 2.0) then
				p([k, j, r3(w), r3(x)])
				return
			end
			y = i
		else
			x = z['x']
		end
		w += 0.01
		i += 1
	}
	
end

p = {'p' => [0, 350],
	'c' => [0, 1200],
	'w' => [0, 75],
	'm' => [0, 350],
	'cg' => [0, 350],
	'cm' => [0, 200],
	'r' => [0.0, 1.0],
	'z' => [0, 1000]
	}

$fs = fs()

p.keys[0...-2].each { |k| $fs.size.times { |j| test(p, k, j) }; puts; $stdout.flush; }