Gas Station

There are N gas stations along a circular route, where the amount of gas at station i is gas[i].
You have a car with an unlimited gas tank and it costs cost[i] of gas to travel from station i to its next station (i+1).
You begin the journey with an empty tank at one of the gas stations. Return the starting gas station's index if you can travel around the
circuit once, otherwise return -1.
The solution is guaranteed to be unique

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