The coding question I got was to implement a Counter class with expiration: ```python class Counter: def __init__(self, window): self.window = window self.data = {} def put(self, element): current_time = time.time() if element in self.data: self.data[element]....
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Here is the list of recent Uber system design problems: 1. **Design a chat system** similar to Facebook Messenger. 2. **Design a driver heatmap** for internal Uber employees. The focus was on data storage, processing, and handling historical data, rather than...
## Problem Description I was given a 2D grid representing a map of positions. Some cells contain robots ('O'), others are empty ('E') or blocked ('X'). The edges of the grid are treated as blockers. I was also given an integer array `distance` of length 4, des...
The coding question I got was: ``` You are given a representation of a folder system using three parallel arrays, along with a specific folder ID. The folders together form a **forest** (i.e., multiple independent trees). The inputs are defined as follows: * *...
The interviewer introduced the prompt as a small reservation system. The question was Reserve Study Rooms: https://www.chillinterview.com/learn/coding-interview-questions/reserve-study-rooms. I was asked to reason about room requests, existing reservations, an...
