bunch38.rb

def f1(n)
	n = (n * 3 + 1) / 2 while (n.odd?)
	n /= 2 while (n.even?)
	return n
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 = f1(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 ** (s = m * 1000)) | 1, 's' => s } 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
 
		if (w == 'r') then
			z = l.sort_by { |x| x['n'] }.reverse[0...100].max_by { |x| x['r'] }
		else
			z = l.max_by { |x| x[w] }
		end
		z.merge!({ 't' => t, 's' => t.to_f / e })
		
                return z if (z['s'] >= m)
        }
 
end

def clear()
	$c = [0] * 2
	$a = {}
	$x = 0 if ($x.nil?)
end

def adv(n)
	l = [n]
	while (n != 1)
		n = f1(n)
		l << n
	end
	return l
end

def bunch(n)

	l = []
	100.times { l << adv(n); n += 2 }
	
	seen = {}
	l.each_with_index \
	{
		|x, j|
		x.each_with_index \
		{ 
			|y, z| 
			break if (seen.member?(y))
			seen[y] = nil
			puts([z, y.to_s(2).length, j == 0 ? 2 : 1].join("\t")) 
		}
		puts
	}
end

def test(p, k, i, m)
	
	z = long(m, k)
	
	clear() if ($c.nil?)
	
	$c[0] += 1
	
	n = z['n']
	return if ($a.member?(n))
	$c[1] += 1
	
	$a[n] = nil
	
	$stderr.puts([$c, k, z['s'], n.to_s(2)].inspect)
	bunch(n)
end

def r2(x)
	sprintf("%.2f", x).to_f
end

p = ['w', 'p', 'c', 'm', 'cg', 'cm', 'r', 'z']

test(p, 'w', 0, 0.5)