IBM IRL Interview | Set 1
Question Details
Following are the details of IBM IRL Interview.Technical Interview 1: 1. Tell me about yourself.2. Asked favourite subject, I told Algorithms data structures.3. Asked Ver...
Full Details
Following are the details of IBM IRL Interview. Technical Interview 1: 1. Tell me about yourself. 2. Asked favourite subject, I told Algorithms & data structures. 3. Asked Vertex cover problem. I explained the brute force method. But don’t know better solution. 4. Implement queue using 2 stacks. 5.
Time complexity of DFS, BFS, Kruskal, Prims. Technical Interview 2: 1. Again tell me about yourself. This time there were lots of good questions from my project. 2. Again asked about vertex cover problem. This is NP hard problem. So no exact solutions exist, but approximation algorithm can be applied. We have to first find the maximal matching edges, then we will put all this pair in the list, remove one by one and check whether by removal of this it is vertex cover or not. For details see Wikipedia for vertex cover. 3. Many questions related to process scheduling. I explained all the scheduling algorithm like FIFO, Round Robin, SJF, SJRF. Then he asked about the detail pro and cons of each scheduling approach. Don’t remember more questions. 4. At last he asked me do you want to do Phd or MS? 5. Why IBM IRL (research profile)? 6. I asked many questions about IBM’s financial support for further higher studies etc. 7. How can I be at IBM and also doing Phd, will IBM allow for that? Tips / Advice: They were looking for strong grip on Algorithms and data structures, also in graph, so prepare it well.
About This Question
This is a reported interview question from a ibm irl interview for a swe role during the technical round reported in 2014.
It covers the following topics: Graphs, Queue, Graph, Stack Queue .
Difficulty rating: Hard
Topics
About Ibm Irl Interview Reports
This question was reported by a candidate who interviewed at Ibm Irl. LeakCode aggregates interview reports from 10+ sources, including 1Point3Acres, Glassdoor, LeetCode Discuss, Blind, Reddit, Indeed, and Nowcoder. Each report is translated where necessary, deduplicated against existing entries, and tagged by company, role, round type, and reporting date.
Use this question as one calibration data point, not a memorization target. Companies typically rotate their question pools every 2-4 months; the exact wording of a 2024 question may differ from what you encounter today. The underlying pattern, difficulty level, and follow-up depth at Ibm Irl are the higher-signal extractions to take from this report.
For broader preparation context, the Ibm Irl interview process typically includes a recruiter screen, one or two technical phone screens, and a 4-5 round on-site loop covering coding, system design (at L4+ levels), and behavioral. Reports tagged on LeakCode show the round-by-round distribution and typical difficulty calibration. To browse questions filtered by round type and seniority, use the company hub linked above.
How To Practice This Type of Question
Solve similar problems on LeetCode under timed conditions (25-35 minutes per medium difficulty). The goal is pattern recognition: recognize the underlying technique (sliding window, two-pointer, BFS, memoized recursion, etc.) within 60-90 seconds of reading. Strong candidates verbalize their hypothesis out loud before coding, then iterate based on feedback. Weak candidates dive into implementation immediately, lose time on the wrong approach, and run out of time for follow-ups.
Companies update their question pools every 2-4 months. The exact wording of any given question may have been retired by the time you interview. Focus your prep on the pattern, not the specific problem. The patterns that appear in Ibm Irl reports consistently are the ones worth investing in; one-off niche problems are not.
During Your Ibm Irl Round
Apply the standard interview round template: clarify requirements (2-3 minutes), state your approach out loud and confirm direction with the interviewer (3-5 minutes), code with narration (15-25 minutes), test with concrete examples including edge cases (5 minutes), discuss optimization or trade-offs if time permits (5 minutes). This template is universally accepted across FAANG and adjacent companies; deviating from it produces weaker interviewer feedback signal.
The single most predictive failure mode in Ibm Irl reports tagged "no hire": not asking clarifying questions. Interviewers are explicitly trained to weight this. Strong candidates ask 3-5 clarifying questions even on problems that look obvious; weak candidates dive into code immediately. The clarifying-question check is often the first signal recorded in the interviewer's written notes.