Learn essential coding patterns to answer problems and prepare for tech companies' interviews.

Ace the JavaScript Coding Interview

This module teaches us the underlying patterns behind common coding interview questions. By learning these essential patterns, we'll be able to unpack and answer any problem the right way—just by assessing the problem statement. This approach was created by FAANG hiring managers to help us prepare for the typical rounds of interviews at major tech companies like Apple, Google, Meta, Microsoft, and Amazon.

By the end of this module, we'll have the skills we need to unlock even the most challenging questions, grok the coding interview, and level up our career with confidence.

Coding Interview Patterns

# Statement

There are $n$ gas stations along a circular route, where the amount of gas at the $i^{th}$ station is `gas[i]`.


We have a car with an unlimited gas tank, and it costs `cost[i]` of gas to travel from the $i^{th}$ station to the next $(i+1)^{th}$ station. We begin the journey with an empty tank at one of the gas stations.


Find the index of the gas station in the integer array `gas` such that if we start from that index we may return to the same index by traversing through all the elements, collecting `gas[i]` and consuming `cost[i]`.

* If it is not possible, return -1.


* If there exists such index, it is guaranteed to be unique.

**Constraints:**

- `gas.length` $==$ `cost.length`
- 1 $\leq$ `gas.length`, `cost.length` $\leq 10^3$ 
- 0 $\leq$ `gas[i]`, `cost[i]` $\leq 10^3$

Gas Stations

Statement