https://edabit.com/ https://edabit.com/challenges https://edabit.com/challenges/csharp https://edabit.com/challenges/cpp https://edabit.com/challenges/java https://edabit.com/challenges/javascript https://edabit.com/challenges/php https://edabit.com/challenges/python3 https://edabit.com/challenges/ruby https://edabit.com/challenges/swift