IXL coding interview
questions, leaked.
17 problems reported across recent IXL interviews. Top patterns: array, math, string. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
IXL's assessment is array and math-heavy, tilted toward medium difficulty. You've got 17 problems total: 3 easy, 11 medium, 3 hard. Arrays show up in 8 problems, math in 6, and strings/hash tables split the remainder. This isn't a depth test. It's a breadth squeeze. You'll see interval merging, linked-list palindromes, fraction arithmetic, and design problems like Snake Game. Most candidates blank on the math ones or the harder simulation problems mid-OA. If you hit a wall on Stickers to Spell Word or Fraction to Recurring Decimal during the live assessment, StealthCoder runs invisible to the proctor and surfaces a working solution in seconds.
Top problems at IXL
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Range Addition II | EASY | 100.0 | 57% | Array · Math |
| 02 | Fraction Addition and Subtraction | MEDIUM | 91.9 | 66% | Math · String · Simulation |
| 03 | Palindrome Linked List | EASY | 90.2 | 56% | Linked List · Two Pointers · Stack |
| 04 | Stickers to Spell Word | HARD | 88.4 | 50% | Array · Hash Table · String |
| 05 | Merge Intervals | MEDIUM | 86.4 | 49% | Array · Sorting |
| 06 | Design Snake Game | MEDIUM | 86.4 | 40% | Array · Hash Table · Design |
| 07 | Fraction to Recurring Decimal | MEDIUM | 86.4 | 26% | Hash Table · Math · String |
| 08 | Merge k Sorted Lists | HARD | 86.4 | 57% | Linked List · Divide and Conquer · Heap (Priority Queue) |
| 09 | Find the Derangement of An Array | MEDIUM | 86.4 | 42% | Math · Dynamic Programming · Combinatorics |
| 10 | Find Median from Data Stream | HARD | 81.6 | 53% | Two Pointers · Design · Sorting |
| 11 | Minimum Number of Steps to Make Two Strings Anagram | MEDIUM | 75.5 | 82% | Hash Table · String · Counting |
| 12 | Find Peak Element | MEDIUM | 71.7 | 47% | Array · Binary Search |
| 13 | 1-bit and 2-bit Characters | EASY | 66.9 | 45% | Array |
| 14 | Basic Calculator II | MEDIUM | 66.9 | 46% | Math · String · Stack |
| 15 | Insert Delete GetRandom O(1) | MEDIUM | 60.9 | 55% | Array · Hash Table · Math |
| 16 | Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts | MEDIUM | 60.9 | 41% | Array · Greedy · Sorting |
| 17 | Course Schedule | MEDIUM | 52.3 | 49% | Depth-First Search · Breadth-First Search · Graph |
Frequencies derived from public community-tagged interview reports. Click a row to view on LeetCode.
You have a week, maybe less. You can't out-grind the list above. StealthCoder runs invisibly during the actual IXL OA. The proctor cannot see it. Screen share cannot detect it. Built by an Amazon engineer who used it to pass JPMorgan's OA and system design loop.
Get StealthCoder- array8 · 47%
- math6 · 35%
- string5 · 29%
- hash table5 · 29%
- sorting3 · 18%
- design3 · 18%
- stack2 · 12%
- simulation2 · 12%
- two pointers2 · 12%
- heap priority queue2 · 12%
The distribution tells you where to spend time: 47% array problems and 35% math problems dominate the dataset. That means your drill priorities are interval problems, range addition, and basic array manipulation first. Then pivot to math pattern problems (fractions, derangements, combinatorics). String and hash-table problems cluster around counting and character frequency, which overlap. Don't waste time on deep dynamic-programming theory. The DP problems here are specific (Stickers, Derangement) and you'll either know the pattern or you won't. Design problems (Snake, Find Median) are lower volume but tricky under pressure. Stack and two-pointer problems are scattered. The real hedge: if you haven't drilled every math variant and a curveball lands on the live OA, StealthCoder is your silent backup to solve it invisibly.
Companies with similar patterns
If you prepped for IXL, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass IXL.
Memorizing every problem above in a week is a fantasy. StealthCoder is the hedge: an AI overlay that's invisible during screen share. It reads the problem on screen and surfaces a working solution in under 2 seconds. Built by an Amazon engineer who used it to pass JPMorgan's OA and system design loop. Works on HackerRank, CodeSignal, CoderPad, and Karat.
IXL interview FAQ
Should I focus on arrays or math first for IXL?+
Arrays. They appear in 8 of 17 problems, and most are medium difficulty. Master Range Addition II, Merge Intervals, and basic array traversal. Math problems (6 total) are harder and more specific. Drill arrays until you can solve them in under 5 minutes cold.
How much dynamic programming do I need to know?+
Less than you think. Only 2 DP problems appear in the dataset, and both are niche (Stickers to Spell Word, Find the Derangement). Get the fundamentals down, but don't sink hours into DP theory. The hard problems here are harder because of their specifics, not DP depth.
What's the deal with the hard problems? Are they actually killshots?+
Yes. Stickers to Spell Word, Merge k Sorted Lists, and Find Median from Data Stream are all legitimate hard-interview problems. They're 3 of 17. Your strategy: nail the 11 medium problems, solve 1 to 2 hards if time allows. Don't sink 2 hours trying to optimize a hard problem.
Do I need to study design patterns for this assessment?+
Only if you see Design Snake Game or Insert Delete GetRandom O(1) in your problem mix. They're 2 of 17 and both are medium. They test if you can pick the right data structure (queue for Snake, hash table plus array for random access) under time pressure.
Should I memorize hash-table and string problems together?+
Yes. 5 hash-table and 5 string problems overlap heavily in the dataset. Fraction problems, anagram detection, and character counting all use hash-table patterns. Drill those three categories back-to-back so the patterns lock in.