Problem database last updated: June 20, 2025
3 problems · 2 Easy, 1 Medium, 0 Hard · Ranked #318 of 458
2 Easy
67% · avg 23%
1 Medium
33% · avg 59%
0 Hard
0% · avg 18%
Based on 3 reported problems, Canonical interviews are easier than average - only 0% Hard compared to 18% across all companies.
The most common topics are array (66.7%), string (33.3%), simulation (33.3%), math (33.3%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Divide a String Into Groups of Size k A string s can be partitioned into groups of size k using the following procedure: | Easy | Very Likely | stringsimulation | Solve |
Evaluate Reverse Polish Notation You are given an array of strings tokens that represents an arithmetic expression in a Reverse Polish Notation. | Medium | Very Likely | arraymathstack | Solve |
Merge Sorted Array You are given two integer arrays nums1 and nums2, sorted in non-decreasing order, and two integers m and n, representing the number of elements in nums1 and num... | Easy | Likely | arraytwo-pointerssorting | Solve |
Divide a String Into Groups of Size k
SolveA string s can be partitioned into groups of size k using the following procedure:
Evaluate Reverse Polish Notation
SolveYou are given an array of strings tokens that represents an arithmetic expression in a Reverse Polish Notation.
Merge Sorted Array
SolveYou are given two integer arrays nums1 and nums2, sorted in non-decreasing order, and two integers m and n, representing the number of elements in nums1 and num...
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent Canonical interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Canonical interviews focus heavily on array, string, simulation 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. Canonical 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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Canonical has been reported to ask 3 distinct coding problems. The most common topics are array, string, simulation. 2 are Easy difficulty, 1 are Medium, and 0 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
Based on 3 reported problems, Canonical interviews are easier than average - only 0% Hard compared to 18% across all companies. 33% 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, simulation. 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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