https://codeeval.com/open_challenges/152
https://codeeval.com/open_challenges/24
https://codeeval.com/open_challenges/21
https://codeeval.com/open_challenges/29
https://codeeval.com/open_challenges/30
https://codeeval.com/open_challenges/113
https://codeeval.com/open_challenges/116
https://codeeval.com/open_challenges/54
Merge remote-tracking branch 'origin/master'