Hello​ Codeforces​ community,

I​ would​ like​ to​ ​invite​ ​you​ ​to​ join​ HackerRank's​ ​101​​ Hack 52​ ​which​ starts​ at​ ​15:00​ ​UTC,​ December​ 3, 2017.

There​ ​will​ be​ five​ ​tasks​ and​ ​three​ ​hours​ for​ you​ to​ solve​ them.​ ​The​ ​contest​ ​will​ ​be​ ​rated​ ​and​ ​the top​ ​ten​ ​contestants will​ receive​ ​HackerRank​ ​T-shirts!

The​ problems​ ​will​ ​have​ ​subtasks​ ​to​ ​make​ it​ ​interesting​ ​for​ ​everyone.​ I strongly​ ​recommend​ ​you​ ​to read​ ​all​ ​the​ ​problems.

I’m​ ​the​ ​author​ ​of​ ​this​ ​round.​ ​ Thanks​ ​to​ ​[user:adamant] ​for​ ​testing​ ​the​ ​problems,​ ​and​ ​thanks​ to [user:kevinsogo]​ ​for​ all​ ​the​ ​help​ ​in​ ​the​ ​other​ ​aspects​ ​of​ ​the​ ​contest.

I​ ​hope​ ​you'll​ ​enjoy​ ​the​ ​problems!

Happy​ ​ Coding!