Uber | Recent Online Assessment 2026 | Placement Coding Round 2026 | Minimum Total Upgrade Cost Graph Algorithm | HackerRank OA Questions

Question: Citywide Internal Communication Network Problem Statement: Uber is designing a citywide internal communication network between its operational hubs such as driver support centers, regional dispatch hubs, and surge-control nodes. Every hub must be able to communicate with every other hub, either directly or indirectly. The city is modeled as a complete network of Uber hubs. However, some connections already require paid infrastructure upgrades, while others can be connected at no additional cost. You are given an undirected complete graph ...