What is Circular Tour problem and how do you solve it?
This question refers to finding a starting point for a circular tour given fuel and distance constraints. It tests greedy algorithm skills.
Why Interviewers Ask This
This problem tests logical reasoning and greedy strategy application. Interviewers ask it to see if you can handle circular buffer problems efficiently. It is a classic coding challenge for technical rounds.
How to Answer This Question
Explain the problem: find a start station where total fuel >= total distance. Use a two-pointer or single-pass greedy approach. Track surplus fuel and reset start if deficit occurs.
Key Points to Cover
- Greedy strategy
- Fuel surplus tracking
- Deficit handling
- Single pass solution
Sample Answer
The Circular Tour problem asks for a starting petrol pump from which a vehicle can complete a full circle. We iterate through stations, maintaining current fuel. If fuel drops below zero, we reset the start to the next s…
Common Mistakes to Avoid
- Using brute force O(N^2)
- Ignoring total fuel check
- Incorrect reset logic
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