Uber Interview Questions
Practice the exact questions companies are asking right now.
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Solve 12 coding interview problems
Below are multiple independent coding problems. --- Problem 1: Reduce an integer to 0 with \(\pm 2^i\) You are given a positive integer \(n\). In one ...
Design a meeting scheduler and shopping cart
You are asked to do two system-design prompts. Prompt A: Meeting Scheduler Design a meeting scheduling system (similar to a calendar + scheduling assi...
Design cart management lifecycle service
Scenario You are designing the backend for an on-demand delivery app (restaurants and grocery). Users can create a cart, modify items from multiple de...
Group strings that are anagrams
Given an array of strings, group the strings into lists such that each list contains strings that are anagrams of each other. Definition Two strings a...
Find minimum activations to absorb all balls
You are given n balls on a 2D plane, where ball i is at coordinate \((x_i, y_i)\). You are also given a distance threshold d. Two balls are considered...
Find earliest time all riders become connected
You are given activity logs for a ride-sharing app. Each log entry indicates that two riders shared a ride at a certain time, which creates an undirec...
Count connected islands using Union-Find
You are given an m x n grid of characters where '1' represents land and '0' represents water. An island is a group of horizontally or vertically adjac...
Solve these algorithmic problems
You are given the following independent coding tasks. For each task, design an algorithm and implement a function that returns the requested output. -...
How to experiment on ETA reduction
Context You work on a consumer app where users see an ETA (estimated time to arrival/delivery) during a funnel (e.g., browsing → checkout → order plac...
Measure feature impact with switchback, PSM, and CACE
You work at a ridesharing company and want to measure the impact of a new membership feature on rides-per-user (RPU). Part A — Switchback experimentat...
Design follow/follower classes
Object-Oriented Design: Follow / Followers Relationship Design a small set of classes for a social product where users can follow and unfollow each ot...
Compute max reachable cells per threshold
You are given: - An m x n integer matrix terrain. - An integer array limits of length k. For each query value L = limits[i], you start at the top-left...
Determine balanced k values in a permutation
You are given a permutation p of the integers 1..n. For a number k (where 1 <= k <= n), call k balanced if there exists a contiguous subarray p[l..r] ...
Transform DataFrame and compute diff-in-diff
You are given a pandas DataFrame df with the following columns: - unit_id (string): entity identifier (e.g., user, city, driver) - group (string): eit...
Find all dictionary words in a grid
You are given: - A 2D grid of characters board with m rows and n columns. - A list of strings words (a dictionary). A word can be formed by starting f...
How do you derive CDF from a PDF?
You are given a continuous random variable \(X\) with probability density function (PDF) \(f_X(x)\). 1. Write the definition of the cumulative distrib...
Compute time for virus to infect grid
You are given an m x n grid representing the state of individuals in a lab. - 0 = empty cell (no one) - 1 = healthy individual - 2 = infected individu...
Find minimum reversals to orient edges away from root
You are given a connected graph with n nodes labeled 0..n-1 and n-1 directed edges. If you ignore edge directions, the edges form a tree. Each directe...
Find robots matching obstacle-distance signature
You are given a 2D grid and a distance signature dist = [left, top, bottom, right]. Grid Each cell is one of: - O : a robot - E : empty - X : obstacle...
Choose K pickup locations minimizing L1 distance
Coding: K Shuttle Pickup Locations (L1) You are given the coordinates of N people on a 2D grid. You want to open K shuttle pickup locations (pickup po...