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| author | marcandre <marcandre@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2015-06-09 03:32:11 +0000 |
|---|---|---|
| committer | marcandre <marcandre@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2015-06-09 03:32:11 +0000 |
| commit | 9d3c64a40a8190684155f3ee085a12a8f3dd2c72 () | |
| tree | 3be3c83ad982659d3c6c7c997bfbc86c52546579 /lib/prime.rb | |
| parent | d46336e71731aa64d71d4573b2741b7de43ec340 (diff) | |
* lib/prime.rb: Simplify and optimize EratosthenesSieve
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50802 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
| -rw-r--r-- | lib/prime.rb | 7 |
1 files changed, 4 insertions, 3 deletions
@@ -424,10 +424,11 @@ class Prime segment_max = [segment_min + max_segment_size, max_cached_prime * 2].min root = Integer(Math.sqrt(segment_max).floor) - sieving_primes = @primes[1 .. -1].take_while { |prime| prime <= root } - segment = ((segment_min + 1) .. segment_max).step(2).to_a - sieving_primes.each do |prime| composite_index = (-(segment_min + 1 + prime) / 2) % prime while composite_index < segment.size do segment[composite_index] = nil |