Must-do problems: Arrays

150 min · Beginner

Arrays are behind almost every coding problem, so these are the ones worth doing yourself. Work top to bottom: easy builds the habits, medium adds swaps and sorts, hard needs a real idea; check each program against all its tests before opening a hint.

What you will learn

Search, count, swap and reverse values in an array
Build new arrays to insert, remove and merge values
Write bubble, selection and insertion sort by hand
Walk and transform 2D arrays row by row

Sign in to continue this lesson

Create an account to read every lesson, practise with the exercises and keep track of your progress.

Create account Sign in

Not ready to sign up? Start with the first lesson