Problem database last updated: June 20, 2025
5 problems · 1 Easy, 2 Medium, 2 Hard · Ranked #252 of 458
1 Easy
20% · avg 23%
2 Medium
40% · avg 59%
2 Hard
40% · avg 18%
Based on 5 reported problems, Deliveroo interviews are significantly harder than average - 40% Hard vs 18% across all companies.
Compared to the industry average, Deliveroo puts unusual emphasis on breadth-first-search (40% of problems, 4.8x the industry average), sorting (40% of problems, 2.8x the industry average), string (60% of problems, 2.1x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are array (60%), string (60%), sorting (40%), hash-table (40%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Find Words Containing Character You are given a 0-indexed array of strings words and a character x. | Easy | Very Likely | arraystring | Solve |
Search Suggestions System You are given an array of strings products and a string searchWord. | Medium | Very Likely | arraystringbinary-search | Solve |
Vertical Order Traversal of a Binary Tree Given the root of a binary tree, calculate the vertical order traversal of the binary tree. | Hard | Likely | hash-tabletreedepth-first-search | Solve |
Count Number of Nice Subarrays Given an array of integers nums and an integer k. A continuous subarray is called nice if there are k odd numbers on it. | Medium | Likely | arrayhash-tablemath | Solve |
Remove Invalid Parentheses Given a string s that contains parentheses and letters, remove the minimum number of invalid parentheses to make the input string valid. | Hard | Likely | stringbacktrackingbreadth-first-search | Solve |
Find Words Containing Character
SolveYou are given a 0-indexed array of strings words and a character x.
Search Suggestions System
SolveYou are given an array of strings products and a string searchWord.
Vertical Order Traversal of a Binary Tree
SolveGiven the root of a binary tree, calculate the vertical order traversal of the binary tree.
Count Number of Nice Subarrays
SolveGiven an array of integers nums and an integer k. A continuous subarray is called nice if there are k odd numbers on it.
Remove Invalid Parentheses
SolveGiven a string s that contains parentheses and letters, remove the minimum number of invalid parentheses to make the input string valid.
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent Deliveroo interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Deliveroo interviews focus heavily on array, string, sorting problems. If you're short on time, these are the categories to prioritize. The problems on this page are sorted by frequency, so start from the top and work your way down.
Beyond solving problems, practice explaining your approach. Deliveroo interviewers care about your thought process - how you break down a problem, consider edge cases, and evaluate tradeoffs between solutions. A clean O(n) solution you can explain clearly beats an O(log n) solution you can't articulate.
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Deliveroo has been reported to ask 5 distinct coding problems. The most common topics are array, string, sorting. 1 are Easy difficulty, 2 are Medium, and 2 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
Based on 5 reported problems, Deliveroo interviews are significantly harder than average - 40% Hard vs 18% across all companies. 40% of questions are Medium difficulty. Focus on the high-frequency Medium problems first, then work through the Hard ones.
Start with the highest-frequency problems listed on this page. Focus on the core topics: array, string, sorting. Practice solving them under time pressure and explaining your approach out loud. Mock interviews with AI can simulate the real experience.
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