diff options
Diffstat (limited to 'benchmark/so_fannkuch.rb')
-rw-r--r-- | benchmark/so_fannkuch.rb | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/benchmark/so_fannkuch.rb b/benchmark/so_fannkuch.rb new file mode 100644 index 0000000000..bac5ecd44c --- /dev/null +++ b/benchmark/so_fannkuch.rb @@ -0,0 +1,45 @@ +# The Computer Language Shootout +# http://shootout.alioth.debian.org/ +# Contributed by Sokolov Yura +# Modified by Ryan Williams + +def fannkuch(n) + maxFlips, m, r, check = 0, n-1, n, 0 + count = (1..n).to_a + perm = (1..n).to_a + + while true + if check < 30 + puts "#{perm}" + check += 1 + end + + while r != 1 + count[r-1] = r + r -= 1 + end + + if perm[0] != 1 and perm[m] != n + perml = perm.clone #.dup + flips = 0 + while (k = perml.first ) != 1 + perml = perml.slice!(0, k).reverse + perml + flips += 1 + end + maxFlips = flips if flips > maxFlips + end + while true + if r==n then return maxFlips end + perm.insert r,perm.shift + break if (count[r] -= 1) > 0 + r += 1 + end + end +end + +def puts *args +end + +N = 9 # (ARGV[0] || 1).to_i +puts "Pfannkuchen(#{N}) = #{fannkuch(N)}" + |