Rental car

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John and Bella rent a car, to tour the city of Paris. Let there be X petrol pumps in a circle, numbered from 0 to (X-1) (both inclusive). Two things are known about each petrol pump: a) the amount of petrol that particular petrol pump will give, and b) the distance from that petrol pump to the next petrol pump. Assuming John could start the tour at any of the petrol pumps, and given a tank of in

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