Problem database last updated: June 20, 2025
10 problems · 3 Easy, 6 Medium, 1 Hard · Ranked #140 of 458
3 Easy
30% · avg 23%
6 Medium
60% · avg 59%
1 Hard
10% · avg 18%
Based on 10 reported problems, CrowdStrike interviews are in line with industry averages - 10% Hard vs 18% overall. The majority (60%) of questions are Medium difficulty, which is typical for companies that want to see solid fundamentals without excessive trick questions.
Compared to the industry average, CrowdStrike puts unusual emphasis on two-pointers (40% of problems, 2.9x the industry average), breadth-first-search (20% of problems, 2.4x the industry average), matrix (20% of problems, 2.3x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are array (70%), two-pointers (40%), string (20%), dynamic-programming (20%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
String Compression Given an array of characters chars, compress it using the following algorithm: | Medium | Very Likely | two-pointersstring | Solve |
Trapping Rain Water Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it can trap after raining. | Hard | Very Likely | arraytwo-pointersdynamic-programming | Solve |
Number of Islands Given an m x n 2D binary grid grid which represents a map of '1's (land) and '0's (water), return the number of islands. | Medium | Very Likely | arraydepth-first-searchbreadth-first-search | Solve |
Merge Intervals Given an array of intervals where intervals[i] = [starti, endi], merge all overlapping intervals, and return an array of the non-overlapping intervals that cove... | Medium | Very Likely | arraysorting | Solve |
Time Based Key-Value Store Design a time-based key-value data structure that can store multiple values for the same key at different time stamps and retrieve the key's value at a certain... | Medium | Likely | hash-tablestringbinary-search | Solve |
Spiral Matrix Given an m x n matrix, return all elements of the matrix in spiral order. | Medium | Likely | arraymatrixsimulation | Solve |
Course Schedule There are a total of numCourses courses you have to take, labeled from 0 to numCourses - 1. You are given an array prerequisites where prerequisites[i] = [ai, b... | Medium | Likely | depth-first-searchbreadth-first-searchgraph | Solve |
Best Time to Buy and Sell Stock You are given an array prices where prices[i] is the price of a given stock on the ith day. | Easy | Likely | arraydynamic-programming | Solve |
Squares of a Sorted Array Given an integer array nums sorted in non-decreasing order, return an array of the squares of each number sorted in non-decreasing order. | Easy | Likely | arraytwo-pointerssorting | Solve |
Move Zeroes Given an integer array nums, move all 0's to the end of it while maintaining the relative order of the non-zero elements. | Easy | Likely | arraytwo-pointers | Solve |
String Compression
SolveGiven an array of characters chars, compress it using the following algorithm:
Trapping Rain Water
SolveGiven n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it can trap after raining.
Number of Islands
SolveGiven an m x n 2D binary grid grid which represents a map of '1's (land) and '0's (water), return the number of islands.
Merge Intervals
SolveGiven an array of intervals where intervals[i] = [starti, endi], merge all overlapping intervals, and return an array of the non-overlapping intervals that cove...
Time Based Key-Value Store
SolveDesign a time-based key-value data structure that can store multiple values for the same key at different time stamps and retrieve the key's value at a certain...
Spiral Matrix
SolveGiven an m x n matrix, return all elements of the matrix in spiral order.
Course Schedule
SolveThere are a total of numCourses courses you have to take, labeled from 0 to numCourses - 1. You are given an array prerequisites where prerequisites[i] = [ai, b...
Best Time to Buy and Sell Stock
SolveYou are given an array prices where prices[i] is the price of a given stock on the ith day.
Squares of a Sorted Array
SolveGiven an integer array nums sorted in non-decreasing order, return an array of the squares of each number sorted in non-decreasing order.
Move Zeroes
SolveGiven an integer array nums, move all 0's to the end of it while maintaining the relative order of the non-zero elements.
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent CrowdStrike interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
CrowdStrike interviews focus heavily on array, two-pointers, string problems. If you're short on time, these are the categories to prioritize. The problems on this page are sorted by frequency, so start from the top and work your way down.
Beyond solving problems, practice explaining your approach. CrowdStrike interviewers care about your thought process - how you break down a problem, consider edge cases, and evaluate tradeoffs between solutions. A clean O(n) solution you can explain clearly beats an O(log n) solution you can't articulate.
Looking for more companies? Browse all 458 companies in our directory, or sharpen your fundamentals with our free data structure visualizers and AI-powered DSA tutor.
CrowdStrike has been reported to ask 10 distinct coding problems. The most common topics are array, two-pointers, string. 3 are Easy difficulty, 6 are Medium, and 1 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
Based on 10 reported problems, CrowdStrike interviews are in line with industry averages - 10% Hard vs 18% overall. 60% of questions are Medium difficulty. Focus on the high-frequency Medium problems first, then work through the Hard ones.
Start with the highest-frequency problems listed on this page. Focus on the core topics: array, two-pointers, string. Practice solving them under time pressure and explaining your approach out loud. Mock interviews with AI can simulate the real experience.
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