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 IXL interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Problem database last updated: June 20, 2025
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IXL Coding Interview Questions
15 problems · 3 Easy, 9 Medium, 3 Hard · Ranked #111 of 458
Difficulty breakdown
3 Easy
20% · avg 23%
9 Medium
60% · avg 59%
3 Hard
20% · avg 18%
Top topics
array
46.7%
math
33.3%2.6x
string
33.3%
hash-table
26.7%
sorting
20%
linked-list
13.3%1.8x
Interview profile
Based on 15 reported problems, IXL interviews are in line with industry averages - 20% 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, IXL puts unusual emphasis on math (33.3% of problems, 2.6x the industry average), design (13.3% of problems, 2.3x the industry average), heap-priority-queue (13.3% of problems, 2.2x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are array (46.7%), math (33.3%), string (33.3%), hash-table (26.7%). Problems below are sorted by frequency, the ones at the top are asked most often.
All 15 problems
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Range Addition II You are given an m x n matrix M initialized with all 0's and an array of operations ops, where ops[i] = [ai, bi] means M[x][y] should be incremented by one for... | Easy | Very Likely | arraymath | Solve |
Fraction Addition and Subtraction Given a string expression representing an expression of fraction addition and subtraction, return the calculation result in string format. | Medium | Very Likely | mathstringsimulation | Solve |
Palindrome Linked List Given the head of a singly linked list, return true if it is a palindrome or false otherwise. | Easy | Very Likely | linked-listtwo-pointersstack | Solve |
Stickers to Spell Word We are given n different types of stickers. Each sticker has a lowercase English word on it. | Hard | Very Likely | arrayhash-tablestring | Solve |
Merge k Sorted Lists You are given an array of k linked-lists lists, each linked-list is sorted in ascending order. | Hard | Very Likely | linked-listdivide-and-conquerheap-priority-queue | 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 |
Fraction to Recurring Decimal Given two integers representing the numerator and denominator of a fraction, return the fraction in string format. | Medium | Very Likely | hash-tablemathstring | Solve |
Find Median from Data Stream The median is the middle value in an ordered integer list. If the size of the list is even, there is no middle value, and the median is the mean of the two midd... | Hard | Very Likely | two-pointersdesignsorting | Solve |
Minimum Number of Steps to Make Two Strings Anagram You are given two strings of the same length s and t. In one step you can choose any character of t and replace it with another character. | Medium | Very Likely | hash-tablestringcounting | Solve |
Find Peak Element A peak element is an element that is strictly greater than its neighbors. | Medium | Likely | arraybinary-search | Solve |
1-bit and 2-bit Characters We have two special characters: | Easy | Likely | array | Solve |
Basic Calculator II Given a string s which represents an expression, evaluate this expression and return its value. | Medium | Likely | mathstringstack | Solve |
Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts You are given a rectangular cake of size h x w and two arrays of integers horizontalCuts and verticalCuts where: | Medium | Likely | arraygreedysorting | Solve |
Insert Delete GetRandom O(1) Implement the RandomizedSet class: | Medium | Likely | arrayhash-tablemath | 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 |
Range Addition II
SolveYou are given an m x n matrix M initialized with all 0's and an array of operations ops, where ops[i] = [ai, bi] means M[x][y] should be incremented by one for...
EasyVery Likely
arraymath
Fraction Addition and Subtraction
SolveGiven a string expression representing an expression of fraction addition and subtraction, return the calculation result in string format.
MediumVery Likely
mathstringsimulation
Palindrome Linked List
SolveGiven the head of a singly linked list, return true if it is a palindrome or false otherwise.
EasyVery Likely
linked-listtwo-pointersstack
Stickers to Spell Word
SolveWe are given n different types of stickers. Each sticker has a lowercase English word on it.
HardVery Likely
arrayhash-tablestring
Merge k Sorted Lists
SolveYou are given an array of k linked-lists lists, each linked-list is sorted in ascending order.
HardVery Likely
linked-listdivide-and-conquerheap-priority-queue
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...
MediumVery Likely
arraysorting
Fraction to Recurring Decimal
SolveGiven two integers representing the numerator and denominator of a fraction, return the fraction in string format.
MediumVery Likely
hash-tablemathstring
Find Median from Data Stream
SolveThe median is the middle value in an ordered integer list. If the size of the list is even, there is no middle value, and the median is the mean of the two midd...
HardVery Likely
two-pointersdesignsorting
Minimum Number of Steps to Make Two Strings Anagram
SolveYou are given two strings of the same length s and t. In one step you can choose any character of t and replace it with another character.
MediumVery Likely
hash-tablestringcounting
Find Peak Element
SolveA peak element is an element that is strictly greater than its neighbors.
MediumLikely
arraybinary-search
Basic Calculator II
SolveGiven a string s which represents an expression, evaluate this expression and return its value.
MediumLikely
mathstringstack
Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts
SolveYou are given a rectangular cake of size h x w and two arrays of integers horizontalCuts and verticalCuts where:
MediumLikely
arraygreedysorting
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...
MediumLikely
depth-first-searchbreadth-first-searchgraph
Preparing for your IXL coding interview
IXL interviews focus heavily on array, math, 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. IXL 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 IXL ask in interviews?add
IXL has been reported to ask 15 distinct coding problems. The most common topics are array, math, string. 3 are Easy difficulty, 9 are Medium, and 3 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
How hard are IXL coding interviews?add
Based on 15 reported problems, IXL interviews are in line with industry averages - 20% Hard vs 18% overall. 60% 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 IXL coding interview?add
Start with the highest-frequency problems listed on this page. Focus on the core topics: array, math, 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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