Finding solutions to programming challenges

Solutions in Python and JavaScript for interesting programming challenges. Practice them to prepare for the technical interview.

Hard

The Grandest Staircase Of Them All

Commander Lambda wants to know how many different types of staircases can be built with each amount of bricks, so they can pick the one with the most options.
Medium

Don't Get Volunteered!

Find how to get to destination on the new flooring outside the henchman dormitories while moving like a chess knight.
Medium

Ion Flux Relabeling

Oh no! Commander Lambda’s latest experiment to improve the efficiency of the LAMBCHOP doomsday device has backfired spectacularly. Quick help!
Easy

Solar Doomsday

Who would’ve guessed? Doomsday devices take a LOT of power. Commander Lambda wants to supplement the LAMBCHOP’s quantum antimatter reactor core with solar arrays, and you’ve been tasked with setting up the solar panels.
Hard

Matrix Layer Rotation

Rotate the matrix R times and print the resultant matrix.
Medium

Bigger is Greater

Rearrange the letters of a string to construct another string such that the new string is lexicographically greater than the original.
Medium

What's Next

Given a compressed binary integer, find the next largest binary integer having the same number of 1s and compress that number.
Medium

Climbing the Leaderboard

Help Alice track her progress toward the top of the leaderboard!
Medium

Larry's Array

Determine whether the array can be sorted using a special permutation
Expert

Morgan and a String!

Find the lexicographically minimal string that can be formed by the combination of two strings.
Easy

Save the Prisoner!

Given M sweets and a circular queue of N prisoners, find the ID of the last prisoner to receive a sweet.
Medium

Password Cracker

Kittens kittens everywhere.