Intervals - Car Pooling
Consider the difference array approach for car pooling. What does the function return when called with trips = [[1,0,0]] and capacity = 0?
Consider the difference array approach for car pooling. What does the function return when called with trips = [[1,0,0]] and capacity = 0?
medium🧾 Code Trace Q4 of Q15
Step-by-Step Solution
Solution:
Step 1: Analyze trip with start=end=0
Passengers get on and off at the same location, so no interval where passengers are actually in the car.Step 2: Check capacity during iteration
diff[0]+=1 and diff[0]-=1 cancel out, current_passengers never exceeds 0 -> return TrueFinal Answer:
Option A -> Option AQuick Check:
Zero-length trip means no passengers onboard -> True [OK]
Quick Trick: Trips with same start and end do not increase passengers onboard [OK]
Common Mistakes:
MISTAKES- Assuming passengers occupy capacity even if start=end
- Expecting error on zero-length intervals
Trap Explanation:
PITFALL- Candidates often think any trip adds passengers, ignoring zero-length intervals.
Interviewer Note:
CONTEXT- Tests handling of edge cases with zero-length trips and capacity zero.
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