Uber的OA使用codesignal平台完成，限时70分钟总共4道题，由平台中所有题库中随机挑选试题。以下是其中一题。

Uber's Online Assessment (OA) is conducted on the CodeSignal platform, with a total time limit of 70 minutes for 4 questions. These questions are randomly selected from the platform's question pool.

Codewriting

Given an infinite number line, you would like to build few blocks and obstacles on it. Specifically, you have to implement code which supports two types of operations:

• [1, x] - builds an obstacle at coordinate x along the number line. It is guaranteed that coordinate x does not contain any obstacles when the operation is performed.
• [2, x, size] - checks whether it's possible to build a block of size size beginning at position x. For example, for size = 2 and x = 0, it will check 0 and 1 on the number line for obstacles. Returns 1 if it is possible, i.e., there are no obstacles at the occupied coordinates, and return 0 otherwise. Please note that this operation does not actually build the block, it only checks whether a block can be built.

Given an array of operations containing both types of operations above, your task is to return a binary string representing the outputs for all [2, x, size] operations.

一些可能出现的题目如下：

Give a list of positive integers, return a sorted list of palindromic numbers in O(n^2) time

Given range a,b, return lowest value a<min<b or 0 if does not exist

Given matrix NxN, sort leftmost column by its weight. Weight is defined as diagonal sum going up and right, (move down when reaching the top)

Find longest subarray divisible by k

由于题目对于每个人都是随机的，所以不建议自己完成，必须时可以请我们csoahelp来协助您完成OA笔试。

Due to the random nature of the questions for each individual, it is not recommended to attempt the assessment on your own. If necessary, you can seek assistance from us at CSOAHelp to successfully complete the OA.

CSOAhelp长期稳定承接各大科技公司如TikTok、Google、Amazon等的OA笔试代写服务，确保满分通过。如有需求，请随时联系我们。

CSOAhelp consistently provide professional online assessment services for major tech companies like TikTok, Google, and Amazon, guaranteeing perfect scores. Feel free to contact us if you're interested.