My accept code at hackerrank.com (Difficulty medium and hard)
https://www.hackerrank.com/challenges/two-two/problem
Code: two-two.js
https://www.hackerrank.com/challenges/3d-surface-area/problem
Code: 3d-surface-area.js
https://www.hackerrank.com/challenges/absolute-permutation/problem
Code: absolute-permutation.js
https://www.hackerrank.com/challenges/almost-sorted/problem
Code: almost-sorted.js
https://www.hackerrank.com/challenges/angry-children/problem
Code: angry-children.js
https://www.hackerrank.com/challenges/bigger-is-greater/problem
Code: bigger-is-greater.js
https://www.hackerrank.com/challenges/climbing-the-leaderboard/problem
Code: climbing-the-leaderboard.js
https://www.hackerrank.com/challenges/encryption/problem
Code: encryption.js
https://www.hackerrank.com/challenges/extra-long-factorials/problem
Code: extra-long-factorials.js
https://www.hackerrank.com/challenges/greedy-florist/problem
Code: greedy-florist.py
https://www.hackerrank.com/challenges/magic-square-forming/problem
Code: magic-square-forming.js
https://www.hackerrank.com/challenges/matrix-rotation-algo/problem
Code: matrix-rotation-algo.js
https://www.hackerrank.com/challenges/non-divisible-subset/problem
Code: non-divisible-subset.js
https://www.hackerrank.com/challenges/organizing-containers-of-balls/problem
Code: organizing-containers-of-balls.js
https://www.hackerrank.com/challenges/pairs/problem
Code: pairs.py
https://www.hackerrank.com/challenges/queens-attack-2/problem
Code: queens-attack-2.js
https://www.hackerrank.com/challenges/substring-diff/problem
Code: substring-diff.py
https://www.hackerrank.com/challenges/the-grid-search/problem
Code: the-grid-search.js
https://www.hackerrank.com/challenges/the-time-in-words/problem
Code: the-time-in-words.js
https://www.hackerrank.com/challenges/two-pluses/problem
Code: two-pluses.js
https://www.hackerrank.com/challenges/rust-murderer/problem
Code: rust-murderer.js
https://www.hackerrank.com/challenges/journey-to-the-moon/problem
Code: journey-to-the-moon.js
https://www.hackerrank.com/challenges/common-child/problem
Code: common-child.js
https://www.hackerrank.com/challenges/unbounded-knapsack/problem
Code: unbounded-knapsack.js