Problem database last updated: June 20, 2025
11 problems · 1 Easy, 9 Medium, 1 Hard · Ranked #134 of 458
1 Easy
9% · avg 23%
9 Medium
82% · avg 59%
1 Hard
9% · avg 18%
Based on 11 reported problems, Commvault interviews are in line with industry averages - 9% Hard vs 18% overall. The majority (82%) 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, Commvault puts unusual emphasis on recursion (18.2% of problems, 4x the industry average), binary-search (27.3% of problems, 3.1x the industry average), linked-list (18.2% of problems, 2.5x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are dynamic-programming (36.4%), array (36.4%), string (27.3%), binary-search (27.3%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Count Vowel Substrings of a String A substring is a contiguous (non-empty) sequence of characters within a string. | Easy | Very Likely | hash-tablestring | Solve |
Decode Ways You have intercepted a secret message encoded as a string of numbers. The message is decoded via the following mapping: | Medium | Very Likely | stringdynamic-programming | Solve |
Reach a Number You are standing at position 0 on an infinite number line. There is a destination at position target. | Medium | Very Likely | mathbinary-search | Solve |
Longest Increasing Subsequence Given an integer array nums, return the length of the longest strictly increasing subsequence. | Medium | Very Likely | arraybinary-searchdynamic-programming | Solve |
Number of Longest Increasing Subsequence Given an integer array nums, return the number of longest increasing subsequences. | Medium | Very Likely | arraydynamic-programmingbinary-indexed-tree | Solve |
Count Unreachable Pairs of Nodes in an Undirected Graph You are given an integer n. There is an undirected graph with n nodes, numbered from 0 to n - 1. You are given a 2D integer array edges where edges[i] = [ai, bi... | Medium | Very Likely | depth-first-searchbreadth-first-searchunion-find | Solve |
Reverse Nodes in k-Group Given the head of a linked list, reverse the nodes of the list k at a time, and return the modified list. | Hard | Very Likely | linked-listrecursion | Solve |
Rotating the Box You are given an m x n matrix of characters boxGrid representing a side-view of a box. Each cell of the box is one of the following: | Medium | Likely | arraytwo-pointersmatrix | Solve |
Add Two Numbers You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order, and each of their nodes contains a sing... | Medium | Likely | linked-listmathrecursion | Solve |
Find Peak Element A peak element is an element that is strictly greater than its neighbors. | Medium | Likely | arraybinary-search | Solve |
Longest Palindromic Substring Given a string s, return the longest palindromic substring in s. | Medium | Likely | two-pointersstringdynamic-programming | Solve |
Count Vowel Substrings of a String
SolveA substring is a contiguous (non-empty) sequence of characters within a string.
Decode Ways
SolveYou have intercepted a secret message encoded as a string of numbers. The message is decoded via the following mapping:
Reach a Number
SolveYou are standing at position 0 on an infinite number line. There is a destination at position target.
Longest Increasing Subsequence
SolveGiven an integer array nums, return the length of the longest strictly increasing subsequence.
Number of Longest Increasing Subsequence
SolveGiven an integer array nums, return the number of longest increasing subsequences.
Count Unreachable Pairs of Nodes in an Undirected Graph
SolveYou are given an integer n. There is an undirected graph with n nodes, numbered from 0 to n - 1. You are given a 2D integer array edges where edges[i] = [ai, bi...
Reverse Nodes in k-Group
SolveGiven the head of a linked list, reverse the nodes of the list k at a time, and return the modified list.
Rotating the Box
SolveYou are given an m x n matrix of characters boxGrid representing a side-view of a box. Each cell of the box is one of the following:
Add Two Numbers
SolveYou are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order, and each of their nodes contains a sing...
Find Peak Element
SolveA peak element is an element that is strictly greater than its neighbors.
Longest Palindromic Substring
SolveGiven a string s, return the longest palindromic substring in s.
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent Commvault interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Commvault interviews focus heavily on dynamic-programming, array, 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. Commvault 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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Commvault has been reported to ask 11 distinct coding problems. The most common topics are dynamic-programming, array, string. 1 are Easy difficulty, 9 are Medium, and 1 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
Based on 11 reported problems, Commvault interviews are in line with industry averages - 9% Hard vs 18% overall. 82% 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: dynamic-programming, array, 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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