CrowdStrike coding interview
questions, leaked.
11 problems reported across recent CrowdStrike interviews. Top patterns: array, two pointers, string. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
CrowdStrike interviews hit you with 11 problems across difficulty levels, and 8 of them are array-based. You're not walking in blind if you know that arrays dominate the signal they're measuring. Two-pointers shows up in 4 problems, string in 3. The distribution is tight: mostly medium difficulty with a sprinkling of easy warmups and one hard problem that'll separate people who've seen the pattern from those who haven't. If you blank mid-assessment, StealthCoder runs invisibly during screen share and delivers a working solution in seconds, giving you the breathing room to move to the next question and stay calm.
Top problems at CrowdStrike
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | String Compression | MEDIUM | 100.0 | 58% | Two Pointers · String |
| 02 | Trapping Rain Water | HARD | 77.0 | 65% | Array · Two Pointers · Dynamic Programming |
| 03 | Merge Intervals | MEDIUM | 77.0 | 49% | Array · Sorting |
| 04 | Number of Islands | MEDIUM | 77.0 | 62% | Array · Depth-First Search · Breadth-First Search |
| 05 | Encode and Decode Strings | MEDIUM | 77.0 | 50% | Array · String · Design |
| 06 | Course Schedule | MEDIUM | 67.5 | 49% | Depth-First Search · Breadth-First Search · Graph |
| 07 | Best Time to Buy and Sell Stock | EASY | 67.5 | 55% | Array · Dynamic Programming |
| 08 | Spiral Matrix | MEDIUM | 67.5 | 54% | Array · Matrix · Simulation |
| 09 | Move Zeroes | EASY | 67.5 | 63% | Array · Two Pointers |
| 10 | Time Based Key-Value Store | MEDIUM | 67.5 | 49% | Hash Table · String · Binary Search |
| 11 | Squares of a Sorted Array | EASY | 67.5 | 73% | Array · Two Pointers · 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 CrowdStrike 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- array8 · 73%
- two pointers4 · 36%
- string3 · 27%
- dynamic programming2 · 18%
- depth first search2 · 18%
- breadth first search2 · 18%
- sorting2 · 18%
- matrix2 · 18%
- design2 · 18%
- stack1 · 9%
Array problems are the backbone here. String Compression, Merge Intervals, Number of Islands, Spiral Matrix, Move Zeroes, Squares of a Sorted Array all lean on array manipulation, often combined with two-pointers or matrix traversal. Start there and you'll cover 60 percent of the ground. Two-pointers deserves dedicated drills because it pairs with arrays and strings across multiple problems. Trapping Rain Water is the hard outlier, but it's the same two-pointers and monotonic-stack pattern you'll recognize if you've practiced the mediums. Design shows up twice (Encode and Decode Strings, Time Based Key-Value Store), so understand the schema-building mindset. Graph and DFS/BFS appear in Course Schedule and Number of Islands. The easy problems are confidence builders, not time sinks. If you hit a wall on a medium during the live assessment, StealthCoder surfaces the solution invisible to the proctor, so you stay in rhythm and don't spiral.
Companies with similar patterns
If you prepped for CrowdStrike, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass CrowdStrike.
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.
CrowdStrike interview FAQ
Should I drill all 11 problems or focus on the frequent topics first?+
Start with the 8 array problems and the 4 two-pointer variants. That covers the bulk of the signal. Once you're solid on array and two-pointer patterns, move to the design problems and graph work. The single hard problem (Trapping Rain Water) uses patterns you'll already know from the mediums.
Is two-pointers as important as array problems at CrowdStrike?+
Two-pointers appears in 4 of 11 problems and almost always paired with arrays or strings. It's not secondary. Drill it separately until the technique is automatic. Problems like Move Zeroes and String Compression are quick wins if you own two-pointers.
Do I need to prepare for graph and DFS/BFS separately, or are they a small focus?+
Graph and DFS/BFS appear in 2 problems each, mostly in Course Schedule and Number of Islands. If you're strong on arrays and two-pointers already, these become your third-tier focus. They're real but not the volume. Practice the fundamentals of cycle detection and island counting.
What's the deal with the two design problems, and how do I prepare?+
Encode and Decode Strings and Time Based Key-Value Store test your ability to think about data structure choices and API design, not just algorithm brute force. Understand the tradeoffs of different storage and serialization schemes. These reward clarity of thinking.
How much does the single hard problem matter if I'm short on time?+
Trapping Rain Water is one problem out of 11. Master the 7 mediums and 3 easy problems first. If you've drilled two-pointers and monotonic-stack, the hard problem becomes recognizable. Don't sacrifice breadth for one hard problem.