Amazon NG OA – Amazon 笔试 – Amazon 笔试真题 – Calculating Maximum Aggregate Temperature Change – dentifying Idle Robots in a Warehouse Grid

I’ve had my Amazon NG OA today(70 minutes with 2 coding questions).


Alexa is Amazon’s virtual AI assistant. It makes it easy to set up your Alexa-enabled devices, listen to music, get weather updates, and much more. The team is working on a new feature that evaluates the aggregate temperature change for a period based on the changes in temperature of previous and upcoming days.

Taking the change in temperature data of n days, the aggregate temperature change evaluated on the i-th day is the maximum of the sum of the changes in temperatures until the i-th day, and the sum of the change in temperatures in the next (n-i) days, with the i-th day temperature change included in both.

Example: temperatureChange = [6, -2, 5]

The aggregate temperature change on each day is evaluated as shown in a detailed explanation, showing how the sum is calculated for day 1 and day 2, and then the maximum aggregate temperature change is determined.


Amazon uses small, Roomba-shaped robots, called “Drives”. They deliver large stacks of products to human workers by following set paths around the warehouse.

The warehouse can be represented in the form of a Cartesian plane, where robots are located at integral points of the form (x, y). When a product is to be delivered to some point (i, j), the nearest robot is sought and chosen. Thus if a robot is surrounded by other robots nearby, it will seldom be chosen for work. More formally, a robot is said to be idle if it has a robot located above, below, left, and right of it. It is guaranteed that no two robots are at the same location.

Example: The x and y coordinates are given as two arrays, with the coordinates aligned by index: x = [1, 1, 2, 2, 2, 3, 3] and y = [1, 2, 3, 1, 2, 3, 1].

The 10 robots are arranged as follows, showing their positions on a grid, and the task is to find the number of idle robots.

These coding questions involve algorithms for processing temperature change data and locating idle robots based on their grid positions.


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