HARD : https://www.hackerrank.com/challenges/beautiful-3-set/problem
HARD : https://www.hackerrank.com/challenges/gridland-provinces/problem (BONUS)
MEDIUM : https://www.hackerrank.com/challenges/bomber-man/problem
MEDIUM : https://www.hackerrank.com/challenges/gena/problem
MEDIUM : https://www.hackerrank.com/challenges/journey-to-the-moon/problem
MEDIUM : https://www.hackerrank.com/challenges/the-story-of-a-tree
MEDIUM : https://www.hackerrank.com/challenges/coin-change (BONUS)