Uber Software Engineer Coding & Algorithms Interview Questions
Practice the exact questions companies are asking right now.
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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...
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 ...
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...
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...
Bracket substrings matching any pattern
Problem You are given a sentence s (words separated by single spaces) and a list of strings patterns. For each word in the sentence, if the word conta...
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...
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] ...
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...
Compute final prices with next smaller discount
You are given an integer array prices of length n, where prices[i] is the original price of the i-th item. For each item i, find the first index j > i...
Compute sums and maximum path in a tree
You are given a binary tree whose nodes store integer values. You must implement your own Node class (e.g., val, left, right). Task Write a function t...
Solve jump maximization and palindromic path queries
You are given two independent algorithmic problems. --- Problem 1 — Jump game with special destinations (maximize score) You are given an integer arra...
Implement an expiring counter class
Expiring Counter (sliding time window) Design and implement an expiring counter that counts events in a recent time window. Requirements - You are giv...
Find cheapest flight with at most K stops
Problem You are given a directed weighted graph representing flights between cities. Inputs - An integer n: number of cities, labeled 0..n-1. - A list...
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...
Return sorted squares of a sorted array
Problem You are given an integer array nums sorted in non-decreasing order. The array may contain negative numbers. Return a new array containing the ...
Compute sums and max path in N-ary tree
You are given the root of an N-ary tree (each node can have 0..k children). Implement the Node class yourself. Assume each node stores an integer valu...
Check if each prefix forms 1..k permutation
You are given an integer array arr of length n that is a permutation of the numbers 1..n (each number appears exactly once), but in arbitrary order. F...
Detect cycle in directed dependency graph
You are given a directed dependency graph representing services in a system. - There are n services, labeled from 0 to n - 1. - You are given a list o...
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. -...
Choose root to minimize edge reversals
Problem You are given a connected graph with n nodes labeled 0..n-1 and n-1 directed edges. If you ignore directions, the edges form a tree (i.e., the...