Problem database last updated: June 20, 2025
3 problems · 3 Easy, 0 Medium, 0 Hard · Ranked #308 of 458
3 Easy
100% · avg 23%
0 Medium
0% · avg 59%
0 Hard
0% · avg 18%
Based on 3 reported problems, Fidelity interviews are easier than average - only 0% Hard compared to 18% across all companies.
The most common topics are array (66.7%), matrix (33.3%), hash-map (33.3%), hash-table (33.3%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Modify the Matrix Given a 0-indexed m x n integer matrix matrix, create a new 0-indexed matrix called answer. Make answer equal to matrix, then replace each element with the valu... | Easy | Very Likely | arraymatrix | Solve |
Two Sum Given an array of integers nums and an integer target, return the indices of the two numbers that add up to target. | Easy | Likely | arrayhash-map | Solve |
Valid Anagram Given two strings s and t, return true if t is an anagram of s, and false otherwise. | Easy | Likely | hash-tablestringsorting | Solve |
Modify the Matrix
SolveGiven a 0-indexed m x n integer matrix matrix, create a new 0-indexed matrix called answer. Make answer equal to matrix, then replace each element with the valu...
Two Sum
SolveGiven an array of integers nums and an integer target, return the indices of the two numbers that add up to target.
Valid Anagram
SolveGiven two strings s and t, return true if t is an anagram of s, and false otherwise.
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent Fidelity interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Fidelity interviews focus heavily on array, matrix, hash-map 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. Fidelity 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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Fidelity has been reported to ask 3 distinct coding problems. The most common topics are array, matrix, hash-map. 3 are Easy difficulty, 0 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, Fidelity interviews are easier than average - only 0% Hard compared to 18% across all companies. 0% 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, matrix, hash-map. 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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