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Decode the Coding Interview in Python: Real-World Examples

Gas Station

Explore the Gas Station coding problem, where you determine the unique starting gas station index to complete a circular trip given gas and cost arrays. Understand the algorithm that checks the feasibility of the trip using total and current tank values, and learn how to implement an efficient, linear time and constant space solution.

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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} ...