Created
December 25, 2011 05:43
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愚直なエラトステネスのふるい(動きがわかるよ)
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| ns = Array.new(99){|i| i+2} | |
| result = Array.new | |
| while ns.length != 0 | |
| prime = ns.shift | |
| ns.delete_if{|x| x % prime == 0} | |
| result.push prime | |
| p ns | |
| p result | |
| puts | |
| end |
本当は、すべての数について走査する必要はない。高々100の平方根までで問題ない
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エラトステネスの篩です。