Problem database last updated: June 20, 2025
8 problems · 3 Easy, 3 Medium, 2 Hard · Ranked #171 of 458
3 Easy
38% · avg 23%
3 Medium
38% · avg 59%
2 Hard
25% · avg 18%
Based on 8 reported problems, Hubspot interviews are slightly harder than average - 25% Hard vs 18% across all companies.
Compared to the industry average, Hubspot puts unusual emphasis on heap-priority-queue (37.5% of problems, 6.2x the industry average), divide-and-conquer (25% of problems, 6x the industry average), sorting (50% of problems, 3.5x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are array (62.5%), sorting (50%), heap-priority-queue (37.5%), linked-list (25%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Merge Sorted Array You are given two integer arrays nums1 and nums2, sorted in non-decreasing order, and two integers m and n, representing the number of elements in nums1 and num... | Easy | Very Likely | arraytwo-pointerssorting | Solve |
Merge Two Sorted Lists You are given the heads of two sorted linked lists list1 and list2. | Easy | Very Likely | linked-listrecursion | Solve |
Two Sum Given an array of integers nums and an integer target, return the indices of the two numbers that add up to target. | Easy | Very Likely | arrayhash-map | 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 |
Maximum Number of Occurrences of a Substring Given a string s, return the maximum number of occurrences of any substring under the following rules: | Medium | Very Likely | hash-tablestringsliding-window | Solve |
Find the K-Sum of an Array You are given an integer array nums and a positive integer k. You can choose any subsequence of the array and sum all of its elements together. | Hard | Likely | arraysortingheap-priority-queue | Solve |
Merge k Sorted Lists You are given an array of k linked-lists lists, each linked-list is sorted in ascending order. | Hard | Likely | linked-listdivide-and-conquerheap-priority-queue | Solve |
Top K Frequent Elements Given an integer array nums and an integer k, return the k most frequent elements. You may return the answer in any order. | Medium | Likely | arrayhash-tabledivide-and-conquer | Solve |
Merge Sorted Array
SolveYou are given two integer arrays nums1 and nums2, sorted in non-decreasing order, and two integers m and n, representing the number of elements in nums1 and num...
Merge Two Sorted Lists
SolveYou are given the heads of two sorted linked lists list1 and list2.
Two Sum
SolveGiven an array of integers nums and an integer target, return the indices of the two numbers that add up to target.
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...
Maximum Number of Occurrences of a Substring
SolveGiven a string s, return the maximum number of occurrences of any substring under the following rules:
Find the K-Sum of an Array
SolveYou are given an integer array nums and a positive integer k. You can choose any subsequence of the array and sum all of its elements together.
Merge k Sorted Lists
SolveYou are given an array of k linked-lists lists, each linked-list is sorted in ascending order.
Top K Frequent Elements
SolveGiven an integer array nums and an integer k, return the k most frequent elements. You may return the answer in any order.
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent Hubspot interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Hubspot interviews focus heavily on array, sorting, heap-priority-queue 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. Hubspot 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.
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Hubspot has been reported to ask 8 distinct coding problems. The most common topics are array, sorting, heap-priority-queue. 3 are Easy difficulty, 3 are Medium, and 2 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
Based on 8 reported problems, Hubspot interviews are slightly harder than average - 25% Hard vs 18% across all companies. 38% 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, sorting, heap-priority-queue. 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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