WorldQuant coding interview
questions, leaked.
4 problems reported across recent WorldQuant interviews. Top patterns: heap priority queue, 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.
WorldQuant's assessment is weighted toward hard problems, and the data shows three of four reported questions land at that level. The pattern is clear: heap and priority queue problems dominate. You're looking at Meeting Rooms II and Find Median from Data Stream as core patterns, plus a hard regex problem and a grid traversal that chains multiple techniques. If you haven't built fluency with heaps under time pressure, you're behind. If you blank on a heap implementation during the live OA, StealthCoder surfaces a working solution in seconds, invisible to the proctor.
Top problems at WorldQuant
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Meeting Rooms II | MEDIUM | 100.0 | 52% | Array · Two Pointers · Greedy |
| 02 | Regular Expression Matching | HARD | 89.7 | 29% | String · Dynamic Programming · Recursion |
| 03 | Minimum Number of Visited Cells in a Grid | HARD | 89.7 | 23% | Array · Dynamic Programming · Stack |
| 04 | Find Median from Data Stream | HARD | 89.7 | 53% | Two Pointers · Design · Sorting |
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 WorldQuant OA. The proctor cannot see it. Screen share cannot detect it. Built by an engineer at a top-10 tech company who can solve these problems cold but didn't want to trust himself in a 90-minute screen share.
Get StealthCoder- heap priority queue3 · 75%
- array2 · 50%
- two pointers2 · 50%
- sorting2 · 50%
- dynamic programming2 · 50%
- greedy1 · 25%
- prefix sum1 · 25%
- string1 · 25%
- recursion1 · 25%
- stack1 · 25%
Heap and priority queue appear in three of four problems, making it the critical survival skill here. Array, two-pointers, sorting, and dynamic programming each show up twice, so you can't ignore DP or greedy approaches either. The difficulty split is harsh: one medium, three hard. Meeting Rooms II blends multiple techniques but leans on sorting and heap logic. Regular Expression Matching and Minimum Number of Visited Cells in a Grid require DP fluency and the ability to combine stack or BFS with heap reasoning. Find Median from Data Stream is a pure heap design problem. Drill heaps first, then DP. When you hit the live assessment, if you're stuck on a heap variant or a DP recurrence, StealthCoder runs invisibly and gives you a concrete working approach so you don't burn 20 minutes on syntax or off-by-one errors.
Companies with similar patterns
If you prepped for WorldQuant, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass WorldQuant.
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 at a top-10 tech company who can solve these problems cold but didn't want to trust himself in a 90-minute screen share. Works on HackerRank, CodeSignal, CoderPad, and Karat.
WorldQuant interview FAQ
How much heap practice is enough for WorldQuant?+
Heap appears in 3 of 4 problems here. You need to implement insert, pop, and peek from memory, build a heap from an array, and reason about heap-based design patterns like the median tracker. One week of daily heap drills is the minimum. If you can't code a min-heap in under 3 minutes, you're not ready.
Should I study dynamic programming before or after heaps?+
Heap first. Two of the four problems require heaps; two require DP. Heaps are syntactically trickier and show up across multiple problems here. DP matters, but heap proficiency is the bottleneck. Spend 3 to 4 days on heaps, then pivot to DP patterns like regex matching and grid traversal.
Is two-pointers worth drilling for this company?+
Yes. Two-pointers appear in 2 of 4 problems and pair well with sorting and greedy logic in Meeting Rooms II. It's not the dominant pattern, but it's the mechanical skill that glues heap and sorting approaches together. One day of two-pointer drills is worth it.
What's the hardest problem WorldQuant reportedly asks?+
Minimum Number of Visited Cells in a Grid chains array, DP, stack, BFS, union-find, and heap logic. It's a synthesis problem, not a single-pattern one. If you see it, you need to recognize that it's solvable via heap-based BFS or DP with a monotonic stack. This is the kind of problem where 10 minutes of clarity beats 40 minutes of coding.
Can I skip strings and regex for this company?+
No. Regular Expression Matching is one of four problems and it's hard, requiring DP and recursion. It's a classic interview problem that most candidates underestimate. Spend a day on regex DP before the assessment. It's a single problem but it's non-negotiable.