Pergunta de entrevista da empresa Atlassian

Code test on Hackerrank. There are five program questions which should finished in 90 minutes. Not very difficult. 1. forget it. 2. the decimal to 7 based conversion. 3. it is about the recursion. easy 4. a robot game. not very difficult. 5.Data validation. not very difficult. but I didn't have much time to do it.