Deloitte vs IBM Interview Questions
Deloitte lists 43 LeetCode interview questions while IBM lists 115. They share 18 problems — 42% of Deloitte's bank and 16% of IBM's. Focus on the overlap first, then drill into 25 Deloitte-only and 97 IBM-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 18 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Deloitte and IBM.
Step 2 — Company-specific depth: Add Deloitte-specific problems like Merge k Sorted Lists, Change Null Values in a Table to the Previous Value, Second Highest Salary and IBM-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: IBM skews harder in our data. Budget extra time for Hard problems if you are targeting that company.
Difficulty Comparison
Top Shared Topics
18 Shared Questions
High-priority problems to practice for both Deloitte and IBM.
| Problem | Difficulty |
|---|---|
| Two Sum | Easy |
| Valid Parentheses | Easy |
| Longest Substring Without Repeating Characters | Medium |
| Longest Palindromic Substring | Medium |
| Best Time to Buy and Sell Stock | Easy |
| Longest Common Prefix | Easy |
| Palindrome Number | Easy |
| Climbing Stairs | Easy |
| Merge Intervals | Medium |
| 3Sum | Medium |
| Maximum Subarray | Medium |
| Remove Duplicates from Sorted Array | Easy |
| Group Anagrams | Medium |
| Roman to Integer | Easy |
| Longest Consecutive Sequence | Medium |
| Rotate Array | Medium |
| Next Permutation | Medium |
| Subarray Sum Equals K | Medium |
Unique to Deloitte (25)
Problems in Deloitte's list that do not appear at IBM.
| Problem | Difficulty |
|---|---|
| Merge k Sorted Lists | Hard |
| Change Null Values in a Table to the Previous Value | Medium |
| Second Highest Salary | Medium |
| Container With Most Water | Medium |
| Valid Palindrome | Easy |
| Add Binary | Easy |
| Managers with at Least 5 Direct Reports | Medium |
| Minimum Time to Repair Cars | Medium |
| First Unique Character in a String | Easy |
| Nth Highest Salary | Medium |
| Remove K Digits | Medium |
| Rising Temperature | Easy |
Unique to IBM (97)
Problems in IBM's list that do not appear at Deloitte.
Frequently Asked Questions
How many LeetCode questions do Deloitte and IBM share?
Deloitte and IBM share 18 LeetCode interview questions. 25 problems appear only in Deloitte's list and 97 appear only in IBM's list.
What topics overlap most between Deloitte and IBM?
The most common shared topics between Deloitte and IBM are Array (12 shared questions), Hash Table (6 shared questions), String (6 shared questions), Two Pointers (5 shared questions), Dynamic Programming (4 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Deloitte or IBM?
Deloitte has 17 Easy, 23 Medium, and 3 Hard questions. IBM has 33 Easy, 73 Medium, and 9 Hard questions. IBM has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Deloitte and IBM?
Start with the 18 shared problems since they cover what both companies ask most often. Then add 20 Deloitte-specific and 20 IBM-specific questions to round out your prep.