coding
Hard
Verified
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
[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
[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
[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
[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
[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
[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
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
Senior
graph
[OA] Graph Traversal — Find all paths for Amazon's Delivery Network
Amazon needs an efficient way to manage delivery routes across its vast logistics network. This involves determining all potential paths between locations in the network.
Problem statement: Given a directed acyclic graph representing delivery routes between locations, return all possible paths from a starting location
-
Input: `graph = [[
Problem statement: Given a directed acyclic graph representing delivery routes between locations, return all possible paths from a starting location
start to a destination location end. Each path must be returned in the order they are found.-
List<List<String>> allPaths(String[][] graph, String start, String end) - Returns a list of all paths from start to end.Example 1: Input: `graph = [[
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