How often are these problems asked?
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent HPE interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Problem database last updated: June 20, 2025
H
HPE Coding Interview Questions
4 problems · 1 Easy, 3 Medium, 0 Hard · Ranked #262 of 458
Difficulty breakdown
1 Easy
25% · avg 23%
3 Medium
75% · avg 59%
0 Hard
0% · avg 18%
Top topics
string
50%1.8x
hash-table
25%
sliding-window
25%5.3x
two-pointers
25%1.8x
linked-list
25%3.5x
recursion
25%5.5x
Interview profile
Based on 4 reported problems, HPE interviews are easier than average - only 0% Hard compared to 18% across all companies. The majority (75%) 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, HPE puts unusual emphasis on string (50% of problems, 1.8x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are string (50%), hash-table (25%), sliding-window (25%), two-pointers (25%). Problems below are sorted by frequency, the ones at the top are asked most often.
All 4 problems
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Longest Substring Without Repeating Characters Given a string s, find the length of the longest substring without duplicate characters. | Medium | Very Likely | hash-tablestringsliding-window | Solve |
Reverse Words in a String Given an input string s, reverse the order of the words. | Medium | Very Likely | two-pointersstring | Solve |
Merge Two Sorted Lists You are given the heads of two sorted linked lists list1 and list2. | Easy | Very Likely | linked-listrecursion | 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 |
Longest Substring Without Repeating Characters
SolveGiven a string s, find the length of the longest substring without duplicate characters.
MediumVery Likely
hash-tablestringsliding-window
Reverse Words in a String
SolveGiven an input string s, reverse the order of the words.
MediumVery Likely
two-pointersstring
Merge Two Sorted Lists
SolveYou are given the heads of two sorted linked lists list1 and list2.
EasyVery Likely
linked-listrecursion
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.
MediumVery Likely
arraydepth-first-searchbreadth-first-search
Preparing for your HPE coding interview
HPE interviews focus heavily on string, hash-table, sliding-window 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. HPE 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.
Frequently Asked Questions
What coding problems does HPE ask in interviews?add
HPE has been reported to ask 4 distinct coding problems. The most common topics are string, hash-table, sliding-window. 1 are Easy difficulty, 3 are Medium, and 0 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
How hard are HPE coding interviews?add
Based on 4 reported problems, HPE interviews are easier than average - only 0% Hard compared to 18% across all companies. 75% of questions are Medium difficulty. Focus on the high-frequency Medium problems first, then work through the Hard ones.
How should I prepare for a HPE coding interview?add
Start with the highest-frequency problems listed on this page. Focus on the core topics: string, hash-table, sliding-window. Practice solving them under time pressure and explaining your approach out loud. Mock interviews with AI can simulate the real experience.
Other companies to explore
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