Problem database last updated: June 20, 2025
2 problems · 0 Easy, 1 Medium, 1 Hard · Ranked #402 of 458
0 Easy
0% · avg 23%
1 Medium
50% · avg 59%
1 Hard
50% · avg 18%
Based on 2 reported problems, redbus interviews are significantly harder than average - 50% Hard vs 18% across all companies.
Compared to the industry average, redbus puts unusual emphasis on stack (100% of problems, 11.6x the industry average), dynamic-programming (100% of problems, 5.1x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are dynamic-programming (100%), stack (100%), array (50%), two-pointers (50%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Trapping Rain Water Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it can trap after raining. | Hard | Very Likely | arraytwo-pointersdynamic-programming | Solve |
Minimum Deletions to Make String Balanced You are given a string s consisting only of characters 'a' and 'b'. | Medium | Very Likely | stringdynamic-programmingstack | Solve |
Trapping Rain Water
SolveGiven n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it can trap after raining.
Minimum Deletions to Make String Balanced
SolveYou are given a string s consisting only of characters 'a' and 'b'.
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent redbus interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
redbus interviews focus heavily on dynamic-programming, stack, array problems. If you're short on time, these are the categories to prioritize. The problems on this page are sorted by frequency, so start from the top and work your way down.
Beyond solving problems, practice explaining your approach. redbus interviewers care about your thought process - how you break down a problem, consider edge cases, and evaluate tradeoffs between solutions. A clean O(n) solution you can explain clearly beats an O(log n) solution you can't articulate.
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redbus has been reported to ask 2 distinct coding problems. The most common topics are dynamic-programming, stack, array. 0 are Easy difficulty, 1 are Medium, and 1 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
Based on 2 reported problems, redbus interviews are significantly harder than average - 50% Hard vs 18% across all companies. 50% of questions are Medium difficulty. Focus on the high-frequency Medium problems first, then work through the Hard ones.
Start with the highest-frequency problems listed on this page. Focus on the core topics: dynamic-programming, stack, array. Practice solving them under time pressure and explaining your approach out loud. Mock interviews with AI can simulate the real experience.
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