Problem database last updated: June 20, 2025
4 problems · 0 Easy, 2 Medium, 2 Hard · Ranked #304 of 458
0 Easy
0% · avg 23%
2 Medium
50% · avg 59%
2 Hard
50% · avg 18%
Based on 4 reported problems, Trilogy interviews are significantly harder than average - 50% Hard vs 18% across all companies.
Compared to the industry average, Trilogy puts unusual emphasis on bit-manipulation (50% of problems, 14.9x the industry average), string (50% of problems, 1.8x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are array (75%), string (50%), bit-manipulation (50%), hash-table (25%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Substring XOR Queries You are given a binary string s, and a 2D integer array queries where queries[i] = [firsti, secondi]. | Medium | Very Likely | arrayhash-tablestring | Solve |
Handling Sum Queries After Update You are given two 0-indexed arrays nums1 and nums2 and a 2D array queries of queries. There are three types of queries: | Hard | Very Likely | arraysegment-tree | Solve |
Bitwise XOR of All Pairings You are given two 0-indexed arrays, nums1 and nums2, consisting of non-negative integers. Let there be another array, nums3, which contains the bitwise XOR of a... | Medium | Very Likely | arraybit-manipulationbrainteaser | Solve |
Distinct Subsequences Given two strings s and t, return the number of distinct subsequences of s which equals t. | Hard | Likely | stringdynamic-programming | Solve |
Substring XOR Queries
SolveYou are given a binary string s, and a 2D integer array queries where queries[i] = [firsti, secondi].
Handling Sum Queries After Update
SolveYou are given two 0-indexed arrays nums1 and nums2 and a 2D array queries of queries. There are three types of queries:
Bitwise XOR of All Pairings
SolveYou are given two 0-indexed arrays, nums1 and nums2, consisting of non-negative integers. Let there be another array, nums3, which contains the bitwise XOR of a...
Distinct Subsequences
SolveGiven two strings s and t, return the number of distinct subsequences of s which equals t.
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent Trilogy interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Trilogy interviews focus heavily on array, string, bit-manipulation 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. Trilogy 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.
Looking for more companies? Browse all 458 companies in our directory, or sharpen your fundamentals with our free data structure visualizers and AI-powered DSA tutor.
Trilogy has been reported to ask 4 distinct coding problems. The most common topics are array, string, bit-manipulation. 0 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 4 reported problems, Trilogy interviews are significantly harder than average - 50% Hard vs 18% across all companies. 50% 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, bit-manipulation. Practice solving them under time pressure and explaining your approach out loud. Mock interviews with AI can simulate the real experience.
Simulate a real Trilogy coding interview with an AI interviewer. Get a scorecard with specific feedback on your problem-solving, code quality, and communication.
Simulate a Trilogy interview with AIarrow_forward
