C, C++14, C#, Closure, Common Lisp, D, Fortran, Go, Haskell, Java7, Java8, JavaScript, OCaml, Pascal, PHP(5.6, 7), Python(2, 3)1, Perl(5.18, 6), Ruby, Scala, Scheme, Text(cat), Visual Basic(Mono), Brainfuck, Standard ML, Crystal, F#,Unlambda, Lua2、MoonScript, Ceylon, Julia, Octave, Nim, TypeScript, Kotlin 問題解説が丁寧なのが特徴のサイト。毎週末に90~120分の競技プログラム形式のコンテストもやっており、コンテスト後にはYouTube で解説も行ってくれます(AtCoder チャンネルへ
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