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- #!/usr/bin/ruby
- # Find factors of a list of integers, using the batch-GCD algorithm.
- # See also:
- # https://facthacks.cr.yp.to/batchgcd.html
- # Submit the factors to:
- # http://factordb.com/search.php
- var arr = []
- ARGF.each {|line|
- if (line.len > 100) {
- line = line.words.last.to_i
- line || next
- arr << line
- }
- }
- zip([arr, Math.batch_gcd(arr...)]).each_2d {|a,b|
- next if (b == 1)
- next if (a == b)
- next if (b.len < 20)
- next if (a/b -> len < 20)
- assert_eq(a%b, 0)
- say "#{a} = #{a/b} * #{b}"
- }
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