Zeta coding interview
questions, leaked.
21 problems reported across recent Zeta interviews. Top patterns: array, hash table, string. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
Zeta's assessment is skewed hard: zero easy problems, 12 medium, 9 hard across 21 reported questions. Arrays dominate the list, appearing in 13 problems, followed by hash tables and strings at 7 each. Expect medium to hard difficulty in the live assessment, with a heavy emphasis on constraint-satisfaction and optimization patterns. The mix favors candidates who can spot when to binary-search, when to greed, and when to chain dynamic programming with other techniques. If you hit a wall mid-OA on a pattern you haven't drilled, StealthCoder runs invisibly and surfaces a working solution in seconds while the proctor sees only your IDE.
Top problems at Zeta
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Apply Operations to Make Two Strings Equal | MEDIUM | 100.0 | 27% | String · Dynamic Programming |
| 02 | Split Array Largest Sum | HARD | 70.6 | 58% | Array · Binary Search · Dynamic Programming |
| 03 | Insert Delete GetRandom O(1) | MEDIUM | 70.6 | 55% | Array · Hash Table · Math |
| 04 | Maximum Profit in Job Scheduling | HARD | 70.6 | 54% | Array · Binary Search · Dynamic Programming |
| 05 | Task Scheduler | MEDIUM | 70.6 | 62% | Array · Hash Table · Greedy |
| 06 | Evaluate Division | MEDIUM | 70.6 | 63% | Array · String · Depth-First Search |
| 07 | IPO | HARD | 70.6 | 53% | Array · Greedy · Sorting |
| 08 | Next Greater Element II | MEDIUM | 70.6 | 66% | Array · Stack · Monotonic Stack |
| 09 | Trapping Rain Water | HARD | 60.8 | 65% | Array · Two Pointers · Dynamic Programming |
| 10 | Count Univalue Subtrees | MEDIUM | 60.8 | 57% | Tree · Depth-First Search · Binary Tree |
| 11 | Insert Delete GetRandom O(1) - Duplicates allowed | HARD | 60.8 | 36% | Array · Hash Table · Math |
| 12 | Find a Peak Element II | MEDIUM | 60.8 | 53% | Array · Binary Search · Matrix |
| 13 | Interleaving String | MEDIUM | 60.8 | 42% | String · Dynamic Programming |
| 14 | Minimum Operations to Write the Letter Y on a Grid | MEDIUM | 60.8 | 62% | Array · Hash Table · Matrix |
| 15 | Number of Islands | MEDIUM | 60.8 | 62% | Array · Depth-First Search · Breadth-First Search |
| 16 | Reverse Nodes in k-Group | HARD | 60.8 | 63% | Linked List · Recursion |
| 17 | Longest Substring Without Repeating Characters | MEDIUM | 60.8 | 37% | Hash Table · String · Sliding Window |
| 18 | Substring with Concatenation of All Words | HARD | 60.8 | 33% | Hash Table · String · Sliding Window |
| 19 | Capacity To Ship Packages Within D Days | MEDIUM | 60.8 | 72% | Array · Binary Search |
| 20 | Longest Valid Parentheses | HARD | 60.8 | 36% | String · Dynamic Programming · Stack |
| 21 | Minimum Window Substring | HARD | 60.8 | 45% | Hash Table · String · Sliding Window |
Frequencies derived from public community-tagged interview reports. Click a row to view on LeetCode.
You have a week, maybe less. You can't out-grind the list above. StealthCoder runs invisibly during the actual Zeta OA. The proctor cannot see it. Screen share cannot detect it. Made by a working FAANG engineer who treats the OA the way companies treat hiring: as a game with rules you should know.
Get StealthCoder- array13 · 62%
- hash table7 · 33%
- string7 · 33%
- dynamic programming6 · 29%
- binary search4 · 19%
- greedy3 · 14%
- stack3 · 14%
- depth first search3 · 14%
- sorting3 · 14%
- matrix3 · 14%
Array problems dominate Zeta's list, but they're not simple iteration tasks. Problems like Split Array Largest Sum and Maximum Profit in Job Scheduling bundle arrays with binary search and DP, forcing you to recognize layered patterns. Hash tables and strings are secondary but critical: Insert Delete GetRandom O(1) requires design thinking and randomization under O(1) constraints. Dynamic programming appears in 6 problems and often pairs with greedy or binary search, so drill DP transitions early. Monotonic stack and sliding window are lighter but deadly if you don't recognize the cue. The hard problems cluster around optimization and design constraints, meaning bruteforce will timeout. Spend your prep time on constraint recognition: when is binary search the key, when is greedy optimal, where does DP save you. StealthCoder is your hedge for the live OA if you misread a problem's structure and need a correct baseline fast.
Companies with similar patterns
If you prepped for Zeta, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass Zeta.
Memorizing every problem above in a week is a fantasy. StealthCoder is the hedge: an AI overlay that's invisible during screen share. It reads the problem on screen and surfaces a working solution in under 2 seconds. Made by a working FAANG engineer who treats the OA the way companies treat hiring: as a game with rules you should know. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Zeta interview FAQ
How much of Zeta's assessment is actually hard problems?+
43 percent (9 of 21 reported problems are hard). Zero easy problems means you skip warm-up and start cold. Prepare to code under pressure immediately. Spend less time on fundamentals, more on recognizing when multiple techniques combine.
Should I drill arrays first for Zeta?+
Yes. Arrays appear in 13 of 21 problems and anchor most hard questions like Split Array Largest Sum and Trapping Rain Water. But don't just solve array problems in isolation. Focus on arrays paired with binary search, DP, or two-pointer patterns. That's what Zeta tests.
How important is dynamic programming for Zeta's OA?+
Critical. DP appears in 6 problems and intersects with arrays, strings, and optimization constraints. Problems like Interleaving String and Maximum Profit in Job Scheduling require solid DP transitions. It's not optional. Know your state-space design cold.
Do I need to know monotonic stack for Zeta?+
It appears in only 2 problems (Next Greater Element II, Trapping Rain Water), but both are highly likely to show up based on frequency reports. If you don't recognize the pattern, you'll timeout. Learn the technique in context of array-based problems.
What topics can I skip or defer for Zeta prep?+
Greedy, sorting, and stack each appear in 3 problems or fewer. They're supporting players, not main events. Master arrays, hash tables, strings, and DP first. Build greedy and sorting as optimizations once the core patterns land.