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6 data structures and algorithms questions6 Interview Questions

Ranking

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

Question

Frequency

Difficulty

Word Ladder

Transform one word into another, one letter at a time, using only words from a given dictionary. Find the shortest sequence of words to reach the target.

ArraysGraphs

Very likely

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

Hard

#1. Word Ladder

Hard

Transform one word into another, one letter at a time, using only words from a given dictionary. Find the shortest sequence of words to reach the target.

ArraysGraphs

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

Number of Ways to Buy Pens and Pencils

You're given a budget and prices for pens and pencils. Determine how many different combinations of buying pens and pencils you can afford within your budget.

Greedy Algorithms

Somewhat likely

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

Medium

#2. Number of Ways to Buy Pens and Pencils

Medium

You're given a budget and prices for pens and pencils. Determine how many different combinations of buying pens and pencils you can afford within your budget.

Greedy Algorithms

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

LRU Cache

Design a data structure that acts as a Least Recently Used (LRU) cache. Implement methods to get and put key-value pairs, evicting the least recently used entry when the cache is full.

Linked ListsHash TableDesign

Somewhat likely

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

Medium

#3. LRU Cache

Medium

Design a data structure that acts as a Least Recently Used (LRU) cache. Implement methods to get and put key-value pairs, evicting the least recently used entry when the cache is full.

Linked ListsHash TableDesign

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

Design Hit Counter

Design a hit counter to track the number of hits recorded in the past 5 minutes. Implement methods to record a hit and retrieve the total hits in the past 5 minutes.

ArraysTwo Pointers

Not likely

If you have a Reddit interview, it's unlikely that you will get this question

Medium

#4. Design Hit Counter

Medium

Design a hit counter to track the number of hits recorded in the past 5 minutes. Implement methods to record a hit and retrieve the total hits in the past 5 minutes.

ArraysTwo Pointers

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

Logger Rate Limiter

Design a logger that prevents duplicate messages from being printed within a certain time window. Determine if a message should be printed based on its timestamp and content, considering rate limiting.

Arrays

Not likely

If you have a Reddit interview, it's unlikely that you will get this question

Easy

#5. Logger Rate Limiter

Easy

Arrays

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