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Quick Summary
Find the smallest contiguous subset of batteries in a circular arrangement that can sustain a call for a specified duration.
Each battery alternates between powering the device and recharging while others are in use.
A valid segment must provide enough total usage time to cover both the call length and the worst-case recharge delay.
What This Tests
Circular array manipulation
Prefix sum for O(1) range calculations
Feasibility condition derivation
Optimization over sliding ranges
Common Patterns
Prefix Sum
Two Pointers
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Acceptance Rate
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Python3
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Input
callDuration =
usageDuration =
chargeTime =
Output
Expected
