Zoho coding interview
questions, leaked.
120 problems reported across recent Zoho interviews. Top patterns: array, string, two pointers. The list below is what most candidates actually saw, plus the honest play if you can't grind all of it.
Zoho's 120 reported problems skew heavily toward arrays and strings. With 70 array problems and 49 string problems dominating the set, you're looking at a company that cares about linear data manipulation and pattern recognition. The difficulty split is 38 easy, 71 medium, 11 hard. Most candidates will spend their prep time grinding the medium tier and miss the real pattern: two-pointers, hash-tables, and dynamic programming show up constantly across the array and string problems. If you hit the assessment and blank on a sliding-window or monotonic-stack variant mid-screen-share, StealthCoder reads the problem and surfaces a working solution invisibly. That's your hedge.
Top problems at Zoho
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Reorganize String | MEDIUM | 0.0 | 56% | Hash Table · String · Greedy |
| 02 | Remove Duplicate Letters | MEDIUM | 0.0 | 51% | String · Stack · Greedy |
| 03 | Climbing Stairs | EASY | 100.0 | 54% | Math · Dynamic Programming · Memoization |
| 04 | Best Time to Buy and Sell Stock | EASY | 96.4 | 55% | Array · Dynamic Programming |
| 05 | Spiral Matrix | MEDIUM | 96.4 | 54% | Array · Matrix · Simulation |
| 06 | Group Anagrams | MEDIUM | 94.4 | 71% | Array · Hash Table · String |
| 07 | Longest Palindromic Substring | MEDIUM | 94.4 | 36% | Two Pointers · String · Dynamic Programming |
| 08 | Longest Substring Without Repeating Characters | MEDIUM | 92.2 | 37% | Hash Table · String · Sliding Window |
| 09 | Decode String | MEDIUM | 88.5 | 61% | String · Stack · Recursion |
| 10 | Valid Parentheses | EASY | 88.5 | 42% | String · Stack |
| 11 | Number of Islands | MEDIUM | 87.2 | 62% | Array · Depth-First Search · Breadth-First Search |
| 12 | Merge Intervals | MEDIUM | 85.7 | 49% | Array · Sorting |
| 13 | Trapping Rain Water | HARD | 85.7 | 65% | Array · Two Pointers · Dynamic Programming |
| 14 | Move Zeroes | EASY | 85.7 | 63% | Array · Two Pointers |
| 15 | Two Sum | EASY | 84.1 | 56% | Array · Hash Table |
| 16 | Sort Even and Odd Indices Independently | EASY | 82.5 | 63% | Array · Sorting |
| 17 | Compare Version Numbers | MEDIUM | 80.7 | 42% | Two Pointers · String |
| 18 | Generate Parentheses | MEDIUM | 78.8 | 77% | String · Dynamic Programming · Backtracking |
| 19 | Largest Number | MEDIUM | 78.8 | 41% | Array · String · Greedy |
| 20 | Rotate Image | MEDIUM | 78.8 | 78% | Array · Math · Matrix |
| 21 | Zigzag Conversion | MEDIUM | 76.7 | 52% | String |
| 22 | Excel Sheet Column Number | EASY | 76.7 | 66% | Math · String |
| 23 | Rotate Array | MEDIUM | 76.7 | 43% | Array · Math · Two Pointers |
| 24 | Find Winner on a Tic Tac Toe Game | EASY | 76.7 | 54% | Array · Hash Table · Matrix |
| 25 | Longest Common Prefix | EASY | 74.4 | 45% | String · Trie |
| 26 | Container With Most Water | MEDIUM | 74.4 | 58% | Array · Two Pointers · Greedy |
| 27 | Remove All Occurrences of a Substring | MEDIUM | 74.4 | 78% | String · Stack · Simulation |
| 28 | Regular Expression Matching | HARD | 69.1 | 29% | String · Dynamic Programming · Recursion |
| 29 | Wildcard Matching | HARD | 69.1 | 30% | String · Dynamic Programming · Greedy |
| 30 | Valid Sudoku | MEDIUM | 65.9 | 62% | Array · Hash Table · Matrix |
| 31 | Text Justification | HARD | 65.9 | 48% | Array · String · Simulation |
| 32 | Word Pattern | EASY | 65.9 | 43% | Hash Table · String |
| 33 | Roman to Integer | EASY | 65.9 | 65% | Hash Table · Math · String |
| 34 | Median of Two Sorted Arrays | HARD | 65.9 | 44% | Array · Binary Search · Divide and Conquer |
| 35 | Replace Elements with Greatest Element on Right Side | EASY | 62.2 | 72% | Array |
| 36 | Edit Distance | MEDIUM | 62.2 | 59% | String · Dynamic Programming |
| 37 | Merge Sorted Array | EASY | 62.2 | 53% | Array · Two Pointers · Sorting |
| 38 | Happy Number | EASY | 62.2 | 58% | Hash Table · Math · Two Pointers |
| 39 | Longest Valid Parentheses | HARD | 62.2 | 36% | String · Dynamic Programming · Stack |
| 40 | Non-overlapping Intervals | MEDIUM | 62.2 | 56% | Array · Dynamic Programming · Greedy |
| 41 | Basic Calculator II | MEDIUM | 62.2 | 46% | Math · String · Stack |
| 42 | Jump Game | MEDIUM | 57.8 | 39% | Array · Dynamic Programming · Greedy |
| 43 | Product of Array Except Self | MEDIUM | 57.8 | 68% | Array · Prefix Sum |
| 44 | 3Sum | MEDIUM | 57.8 | 37% | Array · Two Pointers · Sorting |
| 45 | Search in Rotated Sorted Array | MEDIUM | 57.8 | 43% | Array · Binary Search |
| 46 | Largest Rectangle in Histogram | HARD | 57.8 | 47% | Array · Stack · Monotonic Stack |
| 47 | Sort Colors | MEDIUM | 57.8 | 68% | Array · Two Pointers · Sorting |
| 48 | Combination Sum | MEDIUM | 57.8 | 75% | Array · Backtracking |
| 49 | Partition Equal Subset Sum | MEDIUM | 57.8 | 48% | Array · Dynamic Programming |
| 50 | Restore IP Addresses | MEDIUM | 57.8 | 53% | String · Backtracking |
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 Zoho OA. The proctor cannot see it. Screen share cannot detect it. Made by a working Amazon engineer who got tired of watching qualified friends bomb OAs they'd solve cold in an IDE.
Get StealthCoder- array70 · 58%
- string49 · 41%
- two pointers25 · 21%
- dynamic programming24 · 20%
- hash table20 · 17%
- math18 · 15%
- sorting13 · 11%
- greedy13 · 11%
- stack13 · 11%
- matrix13 · 11%
Zoho's problem set reveals a clear priority: array and string manipulation using efficient pointer work and hashing. Two-pointers appears in 25 problems, hash-table in 20. These aren't separate themes; they're the tools used to solve the heavy array and string load. Dynamic programming and greedy strategies appear in roughly 24 and 13 problems respectively, but they often blend with arrays and strings rather than standing alone. Simulate, stack, and matrix problems round out the middle tier. The easy tier (Climbing Stairs, Valid Parentheses, Two Sum, Move Zeroes) tests fundamentals; the medium tier (Reorganize String, Remove Duplicate Letters, Trapping Rain Water) chains multiple techniques together. Drill two-pointers and hash-tables first because they unlock dozens of the medium problems. If you haven't practiced monotonic stacks or greedy string reordering, StealthCoder is your real-time insurance policy during the live assessment.
Companies with similar patterns
If you prepped for Zoho, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass Zoho.
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 Amazon engineer who got tired of watching qualified friends bomb OAs they'd solve cold in an IDE. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Zoho interview FAQ
Which topic should I study first for Zoho?+
Arrays. Seventy of the 120 problems involve array manipulation. Start with easy array problems (Move Zeroes, Best Time to Buy and Sell Stock), then move to medium array patterns: two-pointers (Trapping Rain Water), sliding-window (Longest Substring Without Repeating Characters), and simulation (Spiral Matrix). String problems are nearly as common; tackle them after building array fluency.
How many string problems should I solve before the OA?+
Forty-nine string problems are on record, but most share patterns with arrays and hash-tables. Focus on the high-frequency patterns: Group Anagrams, Longest Palindromic Substring, Remove Duplicate Letters, Reorganize String, Decode String. Drilling 10-15 string-specific problems with attention to greedy and stack techniques covers most variants you'll face.
Is dynamic programming necessary for Zoho?+
Twenty-four problems involve dynamic programming, but most are easy or medium. Climbing Stairs and Best Time to Buy and Sell Stock are common entry points. Don't spend weeks optimizing DP solutions. Study the basic patterns, then allocate more time to two-pointers and hash-tables, which appear more frequently and carry the same weight in the assessment.
What's the difficulty breakdown, and how should I prepare?+
Thirty-eight easy, 71 medium, 11 hard. The median problem is medium-difficulty. Nail the easy tier in 1-2 days to build confidence. Spend 60% of your prep time on medium problems because that's where most of the assessment lives. Hard problems are rare enough that you can skip them unless you're aiming for top performance.
Should I memorize stack and greedy patterns?+
Stack and greedy each appear in roughly 13 problems. They're secondary to arrays and strings but critical for medium problems like Remove Duplicate Letters, Decode String, and Reorganize String. Understand the pattern (e.g., monotonic stack for trapping water) rather than memorize. If you blank on a variant during the OA, you'll have time to think; if not, StealthCoder solves it in seconds.