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a^2 + b^2 == c^2 かつ a+b+c=1000, a < b < c となる a, b, c を求める (流石にナイーブすぎて遅いバージョン)
(1..1000).each { |i|
(1..1000).each { |j|
(1..1000).each { |k|
next if j <= i
next if k <= j
next if i+j+k != 1000
puts "#{i}, #{j}, #{k}" if i*i + j*j == k*k
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