qnighy https://blog.hatena.ne.jp/qnighy/ 簡潔なQ https://qnighy.hatenablog.com/ Programming ProjectEuler Ruby #!/usr/bin/ruby #ans 1 p (0...1000).select {|i|i%3==0||i%5==0}.inject(0) {|a,b|a+b} #ans 2 require "enumerator" p ((0...1000).to_enum(:step,3).to_a+(0...1000).to_enum(:step,5).to_a).uniq.inject(0) {|a,b|a+b} 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fqnighy.hatenablog.com%2Fentry%2F20090209%2F1234175988" title="ProjectEuler 1 Ruby - 簡潔なQ" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2009-02-09 19:39:48 rich https://qnighy.hatenablog.com/entry/20090209/1234175988 1.0 100%