IBM vs Zeta Interview Questions
IBM lists 115 LeetCode interview questions while Zeta lists 30. They share 7 problems — 6% of IBM's bank and 23% of Zeta's. Focus on the overlap first, then drill into 108 IBM-only and 23 Zeta-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 7 overlapping problems first. These are the highest-yield questions for candidates interviewing at both IBM and Zeta.
Step 2 — Company-specific depth: Add IBM-specific problems like Find the Smallest Divisor Given a Threshold, Gray Code, 3Sum and Zeta-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: Zeta skews harder in our data. Budget extra time for Hard problems if you are targeting that company.
Difficulty Comparison
Top Shared Topics
7 Shared Questions
High-priority problems to practice for both IBM and Zeta.
| Problem | Difficulty |
|---|---|
| Merge Intervals | Medium |
| Longest Substring Without Repeating Characters | Medium |
| Maximum Subarray | Medium |
| Trapping Rain Water | Hard |
| Median of Two Sorted Arrays | Hard |
| Word Break | Medium |
| Task Scheduler | Medium |
Unique to IBM (108)
Problems in IBM's list that do not appear at Zeta.
| Problem | Difficulty |
|---|---|
| Find the Smallest Divisor Given a Threshold | Medium |
| Gray Code | Medium |
| 3Sum | Medium |
| Exclusive Time of Functions | Medium |
| Integer to Roman | Medium |
| Minimum Operations to Make Columns Strictly Increasing | Easy |
| Fizz Buzz | Easy |
| Roman to Integer | Easy |
| Best Time to Buy and Sell Stock | Easy |
| Count Ways to Group Overlapping Ranges | Medium |
| Two Sum | Easy |
| Meeting Rooms II | Medium |
Unique to Zeta (23)
Problems in Zeta's list that do not appear at IBM.
| Problem | Difficulty |
|---|---|
| Apply Operations to Make Two Strings Equal | Medium |
| Split Array Largest Sum | Hard |
| Minimum Window Substring | Hard |
| Capacity To Ship Packages Within D Days | Medium |
| Palindrome Partitioning II | Hard |
| Remove Boxes | Hard |
| Next Greater Element II | Medium |
| Reverse Nodes in k-Group | Hard |
| Maximal Rectangle | Hard |
| Count Univalue Subtrees | Medium |
| Insert Delete GetRandom O(1) | Medium |
| Remove K Digits | Medium |
Frequently Asked Questions
How many LeetCode questions do IBM and Zeta share?
IBM and Zeta share 7 LeetCode interview questions. 108 problems appear only in IBM's list and 23 appear only in Zeta's list.
What topics overlap most between IBM and Zeta?
The most common shared topics between IBM and Zeta are Array (6 shared questions), Hash Table (3 shared questions), Dynamic Programming (3 shared questions), Sorting (2 shared questions), String (2 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: IBM or Zeta?
IBM has 33 Easy, 73 Medium, and 9 Hard questions. Zeta has 0 Easy, 20 Medium, and 10 Hard questions. Zeta has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both IBM and Zeta?
Start with the 7 shared problems since they cover what both companies ask most often. Then add 20 IBM-specific and 20 Zeta-specific questions to round out your prep.