Duolingo Interview Guide

Showing 3 of 4 questions

Ranking

A question's ranking corresponds to how commonly it's asked by Duolingo. The higher the ranking, the more likely you'll encounter it in a Duolingo interview.

Question

Frequency

Difficulty

Encrypt and Decrypt Strings

Implement functions to encrypt a string using a given key and decrypt the encrypted string back to its original form. The encryption method involves substitutions based on the key.

ArraysStrings

Very likely

If you have a Duolingo interview, it's very likely that you will get this question

Hard

#1. Encrypt and Decrypt Strings

Hard

Implement functions to encrypt a string using a given key and decrypt the encrypted string back to its original form. The encryption method involves substitutions based on the key.

ArraysStrings

This question is very likely to be asked in your Duolingo interview

Minimum Number of People to Teach

Imagine a company where employees speak different languages. You need to teach a minimum number of people new languages so that everyone can communicate with at least one colleague.

ArraysGreedy Algorithms

Somewhat likely

If you have a Duolingo interview, you might get this question

Medium

#2. Minimum Number of People to Teach

Medium

Imagine a company where employees speak different languages. You need to teach a minimum number of people new languages so that everyone can communicate with at least one colleague.

ArraysGreedy Algorithms

This question is somewhat likely to be asked in your Duolingo interview

K Radius Subarray Averages

You're given an array and a radius 'k'. Calculate the average of each subarray of length 2k+1 centered at each index, returning an array of these averages. If a subarray is too short (less than 2k+1 elements), mark its average as -1.

ArraysSliding Windows

Not likely

If you have a Duolingo interview, it's unlikely that you will get this question. Duolingo does ask it, but it's rare

Medium

#3. K Radius Subarray Averages

Medium

ArraysSliding Windows

This question is not likely to be asked in your Duolingo interview

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