Created
August 26, 2016 01:03
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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 | |
l << (n = f1(n)) while (n >= n1 && n != 1) | |
return l | |
end | |
def mx(n) | |
return {'ls' => seq2(n).size} | |
end | |
def d(s) | |
c = s.split('').select { |x| x == '1' }.size | |
d = c.to_f / s.length | |
return d | |
end | |
def stat(l) | |
return if (l.empty?) | |
t = t2 = 0 | |
l.each \ | |
{ | |
|x| | |
t += x | |
t2 += x ** 2 | |
} | |
c = l.size | |
a = t.to_f / c | |
z = t2.to_f / c - a ** 2 | |
sd = Math.sqrt(z < 0 ? 0 : z) | |
return l.size, a, sd, l.max, l.min | |
end | |
l = [{'n' => 1, 'p' =>0}.merge(mx(1))] | |
a = {} | |
t1 = Time.now.to_i | |
loop \ | |
{ | |
l = l.sort_by { |x| -x['ls'] } | |
x = l.delete_at(rand([l.size, 50].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)) | |
if (x2['ls'] > x['ls']) then | |
l.push(x2) | |
# j = p | |
j = x2['ls'] | |
a[p] = a.fetch(p, []) + [x2] | |
t = sprintf("%.1fm\n", (Time.now.to_i - t1).to_f / 60).to_f | |
puts([d(x['n'].to_s(2)), d(x2['n'].to_s(2))].join("\t")) | |
$stderr.puts([l.size, t].inspect) if (l.size % 100 == 0) | |
end | |
break if (l.size == 2000) | |
} |
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