Zopsmart coding interview
questions, leaked.
18 problems reported across recent Zopsmart interviews. Top patterns: string, array, two pointers. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
Zopsmart's assessment hits you with 18 problems across three difficulty bands, and the distribution is brutal: 13 medium, 3 hard, 2 easy. String and array patterns dominate the list, followed by two-pointers and hash-table work. You're looking at problems like Minimum Window Substring, Trapping Rain Water, and Group Anagrams. If you blank mid-OA on a sliding-window or monotonic-stack problem, StealthCoder runs invisible during screen share and surfaces a working solution in seconds. You won't have time to drill every permutation before the interview. Know the core patterns cold, and treat the real-time backup as your safety net.
Top problems at Zopsmart
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Zigzag Conversion | MEDIUM | 100.0 | 52% | String |
| 02 | Trapping Rain Water | HARD | 84.5 | 65% | Array · Two Pointers · Dynamic Programming |
| 03 | Reverse Nodes in Even Length Groups | MEDIUM | 82.6 | 61% | Linked List |
| 04 | Minimum Window Substring | HARD | 72.5 | 45% | Hash Table · String · Sliding Window |
| 05 | Fraction Addition and Subtraction | MEDIUM | 68.9 | 66% | Math · String · Simulation |
| 06 | Bulls and Cows | MEDIUM | 68.9 | 51% | Hash Table · String · Counting |
| 07 | Remove K Digits | MEDIUM | 64.5 | 35% | String · Stack · Greedy |
| 08 | Reverse Words in a String | MEDIUM | 58.8 | 52% | Two Pointers · String |
| 09 | Group Anagrams | MEDIUM | 58.8 | 71% | Array · Hash Table · String |
| 10 | Container With Most Water | MEDIUM | 58.8 | 58% | Array · Two Pointers · Greedy |
| 11 | Longest Palindromic Substring | MEDIUM | 50.8 | 36% | Two Pointers · String · Dynamic Programming |
| 12 | Best Time to Buy and Sell Stock | EASY | 50.8 | 55% | Array · Dynamic Programming |
| 13 | 3Sum | MEDIUM | 50.8 | 37% | Array · Two Pointers · Sorting |
| 14 | Add Two Numbers | MEDIUM | 50.8 | 46% | Linked List · Math · Recursion |
| 15 | Sort Colors | MEDIUM | 50.8 | 68% | Array · Two Pointers · Sorting |
| 16 | Letter Combinations of a Phone Number | MEDIUM | 50.8 | 64% | Hash Table · String · Backtracking |
| 17 | Reverse Linked List | EASY | 50.8 | 79% | Linked List · Recursion |
| 18 | Reverse Nodes in k-Group | HARD | 50.8 | 63% | Linked List · Recursion |
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 Zopsmart OA. The proctor cannot see it. Screen share cannot detect it. Built by an engineer who got tired of watching his cohort grind for six months and still get filtered at the OA stage.
Get StealthCoder- string9 · 50%
- array6 · 33%
- two pointers6 · 33%
- hash table4 · 22%
- linked list4 · 22%
- dynamic programming3 · 17%
- sorting3 · 17%
- recursion3 · 17%
- stack2 · 11%
- monotonic stack2 · 11%
String manipulation owns this interview. Nine of the 18 problems involve string logic, and they span every difficulty tier. Two-pointers and array work follow close behind, each appearing six times. The median difficulty is medium, which means you can't rely on intuition or half-solutions. Trapping Rain Water and Minimum Window Substring are both hard problems with multiple valid approaches, and Zopsmart will expect clean trade-off discussion. Hash-table counting, monotonic-stack logic, and linked-list manipulation fill the rest. Study string and two-pointer patterns until they're automatic. Hash-table problems tend to be about character frequency or window bounds. When you hit the live assessment, if you're stuck on a stack-based string problem like Remove K Digits or can't see the two-pointer angle on Container With Most Water, StealthCoder is the hedge that gets you unstuck without flagging the proctor.
Companies with similar patterns
If you prepped for Zopsmart, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass Zopsmart.
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. Built by an engineer who got tired of watching his cohort grind for six months and still get filtered at the OA stage. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Zopsmart interview FAQ
Should I focus on string problems first for Zopsmart?+
Yes. Nine of 18 problems involve strings, and they appear at every difficulty level. Zigzag Conversion, Minimum Window Substring, and Reverse Words in a String are all on the hit list. Master string indexing, two-pointer reversal, and sliding-window substrings before anything else.
How many two-pointer problems will I see?+
Six problems use two-pointer logic directly: Container With Most Water, 3Sum, Sort Colors, Longest Palindromic Substring, Reverse Words in a String, and Trapping Rain Water. Two-pointers is the second-most-tested pattern. Know convergence, divergence, and collision detection cold.
Is linked-list critical for Zopsmart?+
Four problems touch linked lists. Reverse Nodes in Even Length Groups and Add Two Numbers are on the board, so you'll see them. Brush up on node reversal and recursive list manipulation, but don't spend as much time here as you would on strings and arrays.
What's the hardest part of this interview?+
The three hard problems are Trapping Rain Water, Minimum Window Substring, and one more. Trapping Rain Water alone blends arrays, two-pointers, dynamic programming, stack, and monotonic-stack logic. These require clean mental models and strong trade-off discussion. The hard tier is where candidates leak points.
How much time should I spend on dynamic programming?+
Three problems touch DP, and two of them are hard. Best Time to Buy and Sell Stock, Longest Palindromic Substring, and Trapping Rain Water all involve DP reasoning. It's worth solid drilling, but string and two-pointer problems will eat more of your interview time.