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Hard
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#1
1. Binary Tree Cameras
Category: Binary tree coding problemYou are given the root of a binary tree. You need to install the minimum number of cameras on the tree nodes such that every node in the tree is...Input: Binary tree
Output: Integer
coding
Hard
Verified Question
#2
2. [CodeSignal] Warehouse Emergency Deliveries
Category: Array coding problemAmazon has opened a new warehouse recently. There are no products in the warehouse currently. The warehouse is under inspection for
n days. The...Input: ArrayOutput: Integer
coding
Hard
Verified Question
#3
3. [CodeSignal] Permutation Sorter
Category: Combinatorics coding problemAmazon engineers are testing a new tool, the Permutation Sorter, built to reorder sequences using limited operations. Given a permutation of...Input: Integer(s)
Output: Integer
coding
Hard
Verified Question
#4
4. [CodeSignal] Maximum Product Rating
Category: Array coding problemThe engineers at Amazon are working on a new rating system for their products. For each product, an array
customer_rating is maintained for the...Input: ArrayOutput: Computed result
coding
Medium
Verified Question
#5
5. [CodeSignal] Drone Hub Travel
Category: Array coding problemAmazon is expanding its next-generation drone delivery network, consisting of
m hubs arranged in a circular ring (Hub 1 is adjacent to Hub m)....Input: ArrayOutput: Computed result
coding
Medium
Verified Question
#6
6. [CodeSignal] Minimum Security Groups
Category: Array coding problemA financial services company has requested AWS for a private deployment of its cloud network. There are
n servers in the network where the security...Input: ArrayOutput: Integer
coding
Medium
Verified Question
#7
7. [CodeSignal] Maximum Secure Deliveries
Category: Array coding problemYou are given an array
deliveryLogs of size n, where each element represents the number of parts delivered in the i-th log. You are also given...Input: ArrayOutput: Integer
coding
Medium
Verified Question
#8
8. Maximum Interval Overlap
Category: Interval-based coding problemYou are given a list of closed intervals on the number line, where each interval
[start, end] includes both endpoints. Find the maximum number of...Input: ListOutput: Integer
coding
Hard
concurrency
#1
1. [OA] Parallel Test Execution — Design an efficient framework for running Amazon's QA tests in parallel
To accommodate the high scale of Amazon's services, test automation needs to perform efficiently. This requires creating a robust framework that can handle concurrent test executions without resource bottlenecks.
Implement a class named
-
-
Input:
Output:
Explanation: The tests are executed simultaneously, returning their results in a list.Constraints:
-
- Each test must not exceed 2 seconds of execution time.
Implement a class named
ParallelTestRunner with the following methods:-
executeTests(tests: List[Test]): List<Result] - Executes a list of tests in parallel and returns their results.-
addTest(test: Test): None - Adds a test to the runner.Example 1:Input:
tests = [Test1, Test2, Test3]Output:
[Result1, Result2, Result3]Explanation: The tests are executed simultaneously, returning their results in a list.Constraints:
-
1 <= tests.length <= 1000- Each test must not exceed 2 seconds of execution time.
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