Quora coding interview
questions, leaked.
18 problems reported across recent Quora interviews. Top patterns: array, hash table, math. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
Quora's coding interviews are deceptively light on hard problems, with 18 total questions skewed toward medium difficulty. But that false comfort kills candidates. Array and hash-table problems dominate the list, and they don't ask them gently. You'll face multi-step array operations, hash-table designs, and math-heavy string problems. The median candidate freezes on "Construct Target Array With Multiple Sums" or "Range Frequency Queries" because they look like straightforward problems until you're live. That's where StealthCoder becomes your second brain: if you blank mid-assessment, it reads the problem and surfaces a working solution invisible to the proctor.
Top problems at Quora
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Construct Target Array With Multiple Sums | HARD | 100.0 | 36% | Array · Heap (Priority Queue) |
| 02 | Find Numbers with Even Number of Digits | EASY | 87.2 | 79% | Array · Math |
| 03 | 3Sum With Multiplicity | MEDIUM | 87.2 | 46% | Array · Hash Table · Two Pointers |
| 04 | Subtract the Product and Sum of Digits of an Integer | EASY | 87.2 | 87% | Math |
| 05 | Find the K-Beauty of a Number | EASY | 87.2 | 62% | Math · String · Sliding Window |
| 06 | Exam Room | MEDIUM | 87.2 | 43% | Design · Heap (Priority Queue) · Ordered Set |
| 07 | Maximum Number of Words You Can Type | EASY | 87.2 | 75% | Hash Table · String |
| 08 | Range Frequency Queries | MEDIUM | 87.2 | 40% | Array · Hash Table · Binary Search |
| 09 | 1-bit and 2-bit Characters | EASY | 87.2 | 45% | Array |
| 10 | Finding Pairs With a Certain Sum | MEDIUM | 87.2 | 49% | Array · Hash Table · Design |
| 11 | Get Biggest Three Rhombus Sums in a Grid | MEDIUM | 87.2 | 49% | Array · Math · Sorting |
| 12 | Sort the Matrix Diagonally | MEDIUM | 87.2 | 83% | Array · Sorting · Matrix |
| 13 | Encode Number | MEDIUM | 87.2 | 70% | Math · String · Bit Manipulation |
| 14 | Substrings of Size Three with Distinct Characters | EASY | 87.2 | 75% | Hash Table · String · Sliding Window |
| 15 | Subarray Sum Equals K | MEDIUM | 52.3 | 45% | Array · Hash Table · Prefix Sum |
| 16 | Number of Subarrays with Bounded Maximum | MEDIUM | 52.3 | 54% | Array · Two Pointers |
| 17 | Binary Tree Cameras | HARD | 52.3 | 47% | Dynamic Programming · Tree · Depth-First Search |
| 18 | Insert Delete GetRandom O(1) | MEDIUM | 52.3 | 55% | Array · Hash Table · Math |
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 Quora OA. The proctor cannot see it. Screen share cannot detect it. Made by an Amazon engineer who watched the leaked-problem repo become an industry secret. He decided you should have it too.
Get StealthCoder- array11 · 61%
- hash table7 · 39%
- math6 · 33%
- string4 · 22%
- design4 · 22%
- heap priority queue3 · 17%
- sorting3 · 17%
- prefix sum2 · 11%
- two pointers2 · 11%
- counting2 · 11%
The topic distribution reveals Quora's true focus. Array shows up in 11 of 18 problems, often paired with hash tables or math logic. Hash tables appear in 7, and they're not simple lookups, they're building blocks for prefix-sum and counting patterns. Math comes in 6 times but rarely stands alone; it's embedded in string validation and digit manipulation. Design problems like "Exam Room" and "Range Frequency Queries" mix data structures with algorithmic thinking. The easy problems are your baseline: "Find Numbers with Even Number of Digits", "Subtract the Product and Sum of Digits", "Maximum Number of Words You Can Type". Master those first. Medium is where time burns. Drill "3Sum With Multiplicity", "Subarray Sum Equals K", and matrix operations. The two hard problems demand heap and priority-queue comfort. StealthCoder is your hedge if a hard problem hits you cold during the live assessment.
Companies with similar patterns
If you prepped for Quora, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass Quora.
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 an Amazon engineer who watched the leaked-problem repo become an industry secret. He decided you should have it too. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Quora interview FAQ
Should I prioritize array or hash-table problems first for Quora?+
Array first. It appears in 11 of 18 problems reported. Hash tables follow immediately after, but they're almost always paired with arrays. Get comfortable with array iteration, slicing, and prefix sums before diving into hash-table design. The 6 easy array problems are your warm-up.
How many medium-difficulty problems should I solve before my Quora OA?+
Quora's distribution is 10 medium out of 18 total. Aim to solve at least 8 to 10 medium problems from the reported set, especially "3Sum With Multiplicity", "Subarray Sum Equals K", and "Range Frequency Queries". These cover the overlapping patterns you'll see live.
Are the hard problems a dealbreaker if I can't solve them?+
Not entirely. Only 2 of 18 are hard, and both involve heaps and arrays. If you're solid on the 10 medium problems and 6 easy ones, you can still pass. Hard problems are tie-breakers. If you hit one cold, don't panic; focus on getting the mediums right.
What math topics show up in Quora interviews?+
Math appears in 6 problems but rarely as pure math. It's woven into digit manipulation, string validation, and grid calculations. "Subtract the Product and Sum of Digits" and "Find the K-Beauty of a Number" are representative. Expect modular arithmetic and digit extraction, not calculus.
Should I study design patterns for Quora?+
Yes, but lightly. Design appears in 4 of 18 problems, mostly in "Exam Room" and "Range Frequency Queries". These blend design thinking with heap or hash-table implementation. If you're short on time, prioritize array and hash-table drilling, then loop back to design problems.