IBM vs Qualcomm Interview Questions
IBM lists 115 LeetCode interview questions while Qualcomm lists 62. They share 19 problems — 17% of IBM's bank and 31% of Qualcomm's. Focus on the overlap first, then drill into 96 IBM-only and 43 Qualcomm-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 19 overlapping problems first. These are the highest-yield questions for candidates interviewing at both IBM and Qualcomm.
Step 2 — Company-specific depth: Add IBM-specific problems like Find the Smallest Divisor Given a Threshold, Gray Code, Exclusive Time of Functions and Qualcomm-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: Qualcomm skews harder in our data. Budget extra time for Hard problems if you are targeting that company.
Difficulty Comparison
Top Shared Topics
19 Shared Questions
High-priority problems to practice for both IBM and Qualcomm.
| Problem | Difficulty |
|---|---|
| 3Sum | Medium |
| Two Sum | Easy |
| Rotate Image | Medium |
| Merge Intervals | Medium |
| Longest Substring Without Repeating Characters | Medium |
| Longest Common Prefix | Easy |
| Valid Parentheses | Easy |
| Merge Sorted Array | Easy |
| Climbing Stairs | Easy |
| Trapping Rain Water | Hard |
| Find the Index of the First Occurrence in a String | Easy |
| Subarray Sum Equals K | Medium |
| Median of Two Sorted Arrays | Hard |
| Palindrome Number | Easy |
| Reverse Integer | Medium |
| Remove Duplicates from Sorted Array | Easy |
| Generate Parentheses | Medium |
| LRU Cache | Medium |
| Majority Element | Easy |
Unique to IBM (96)
Problems in IBM's list that do not appear at Qualcomm.
Unique to Qualcomm (43)
Problems in Qualcomm's list that do not appear at IBM.
| Problem | Difficulty |
|---|---|
| String Compression III | Medium |
| Maximum Number of Ones | Hard |
| Reverse Nodes in k-Group | Hard |
| Number of Islands | Medium |
| Reverse Linked List | Easy |
| Remove Nth Node From End of List | Medium |
| Reverse Bits | Easy |
| Power of Two | Easy |
| Rectangle Overlap | Easy |
| Linked List Cycle | Easy |
| Reverse String | Easy |
| Middle of the Linked List | Easy |
Frequently Asked Questions
How many LeetCode questions do IBM and Qualcomm share?
IBM and Qualcomm share 19 LeetCode interview questions. 96 problems appear only in IBM's list and 43 appear only in Qualcomm's list.
What topics overlap most between IBM and Qualcomm?
The most common shared topics between IBM and Qualcomm are Array (10 shared questions), Two Pointers (5 shared questions), Hash Table (5 shared questions), String (5 shared questions), Sorting (4 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: IBM or Qualcomm?
IBM has 33 Easy, 73 Medium, and 9 Hard questions. Qualcomm has 28 Easy, 25 Medium, and 9 Hard questions. Qualcomm has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both IBM and Qualcomm?
Start with the 19 shared problems since they cover what both companies ask most often. Then add 20 IBM-specific and 20 Qualcomm-specific questions to round out your prep.