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Decode the Coding Interview in Java: Real-World Examples

Gas Station

Explore the gas station problem where you determine the starting point on a circular route to complete a full trip given gas and cost arrays. Learn to implement an algorithm that uses a single loop and constant space to find the unique start or return -1 if impossible.

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Description

Suppose there are n gas stations identified by integers 0, 1, . . ., n-1, where the amount of gas at the ithi^{th} station is gas[i]. Imagine that these gas stations are arranged clockwise in a circle, as shown below.

You have a car with an unlimited gas tank. It costs cost[i] amount of gas to travel from the ithi^{th} station to the (i+1)th(i + 1)^{th} ...