Amazon OA : Optimizing AWS Server Scaling and Amazon Cart Management: A Deep Dive into Two Algorithmic Problems


AWS provides scalable systems. A set of n servers are used for horizontally scaling an application. The goal is to have the computational power of the servers in non-decreasing order. To do so, you can increase the computational power of each server in any contiguous segment by x. Choose the values of x such that after the computational powers are in non-decreasing order, the sum of the x values is minimum.

There are n = 5 servers and their computational power = [3, 4, 1, 6, 2].

Add 3 units to the subarray (2, 4) and 4 units to the subarray (4, 4). The final arrangement of the servers is: [3, 4, 4, 9, 9]. The answer is 3 + 4 = 7.



As an aspiring developer at Amazon, you are building a prototype for a cart management service. There is an array of integers, items, that represents the item ids present in the cart initially. Given an array of q integers, query, your service must perform as follows. Each integer is an item id to be added to or removed from the cart.

  • If the query integer is positive, add the integer representing an item id to the back of the cart.
  • If the integer is negative, remove the first occurrence of the integer from the cart.

Report an array that represents the final cart after processing all the queries.

For example, initially, there are n = 5 items in the cart represented as cart = [1, 2, 1, 2, 1] and queries = [-1, -1, 3, 4, -3].

-1Delete first 1 from cart[2, 1, 2, 1]
-1Delete first 1 from cart[2, 2, 1]
3Append 3 to cart[2, 2, 1, 3]
4Append 4 to cart[2, 2, 1, 3, 4]
-3Delete first 3 from cart[2, 2, 1, 4]


These two algorithmic problems highlight the importance of efficient data manipulation and optimization in real-world applications like server scaling and cart management. By understanding and applying the right algorithms, we can ensure optimal performance and user experience.

If you have any questions or would like to discuss these problems further, contact us!

经过我们的强力面试辅助,OA代写,候选人通过这些面试题的解析和沟通,面试官不仅了解了候选人的编程能力,也看到了我在解决问题过程中清晰的思路和有效的沟通技巧。这些不仅有助于应对 Meta 的面试,同时也能提升我们解决实际编程问题的能力。祝大家面试顺利!


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