Created
July 28, 2016 00:54
-
-
Save vznvzn/eea5150cb807dc847b9f3d28c2a8b0b1 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
def f1(n) | |
n = (n * 3 + 1) / 2 while (n % 2 == 1) | |
n /= 2 while (n % 2 == 0) | |
return n | |
end | |
def seq2(n) | |
l = [n] | |
n1 = n | |
begin | |
l << (n = f1(n)) | |
end while (n >= n1 && n != 1) | |
return l | |
end | |
def d(s) | |
c = s.split('').select { |x| x == '1' }.size | |
d = c.to_f / s.length | |
return (0.5 - d).abs | |
end | |
def r(x) | |
return sprintf("%.3f", x).to_f | |
end | |
def mx(n) | |
l = seq2(n) | |
d = d(n.to_s) | |
mx = l.max | |
ns = n.to_s(2).length | |
v = mx.to_s(2).length.to_f / ns | |
h = l.size.to_f / ns | |
return {'by' => [-(v * h), d], 'ns' => ns, 'ls' => l.size, | |
'v' => r(v), 'h' => r(l.size.to_f / ns)} | |
end | |
def fmt(x) | |
x = x.dup | |
['n', 'p', 'by'].each { |k| x.delete(k) } | |
return x.to_a | |
end | |
def hard(c) | |
l = [{'n' => 1, 'p' =>0}.merge(mx(1))] | |
loop \ | |
{ | |
l.sort_by! { |x| x['by'] } | |
return l[l.size / 2] if (l.size == c) | |
x = l.delete_at(rand([l.size, 100].min)) | |
p = x['p'] + 1 | |
n = x['n'] | |
x1 = x.dup | |
x1['p'] = p | |
l.push(x1) | |
x2 = {} | |
n |= (1 << p) | |
x2['n'] = n | |
x2['p'] = p | |
x2.merge!(mx(n)) | |
l.push(x2) | |
puts(([l.size] + fmt(x2)).join("\t")) | |
$stdout.flush | |
} | |
end | |
z = hard(10000) |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment