Uber Software Engineer Coding & Algorithms Interview Questions
Practice 98 real Coding & Algorithms interview questions for Software Engineer roles at Uber.
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"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
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"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
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...
Design time-versioned KV without timestamp argument
Design a time-versioned key-value store that does not accept a timestamp argument on writes. Support set(key, value) which stores the value with an in...
Simulate one-round color elimination on a grid
Given an m x n integer matrix board where board[r][c] > 0 represents a color and 0 represents empty: ( 1) A nonzero cell at (r,c) explodes in this rou...
Implement binary search variants
Implement binary search on a sorted integer array without using library functions. Provide both iterative and recursive versions that: (a) return the ...
Minimize time using elevator then climb stairs
Problem You need to go up n floors (from floor 0 to floor n). You may: 1. Take the elevator first (at most once, only at the start) for k floors, wher...
Solve minimum rate and subset sum
1) Minimum rate to finish vaults within a deadline: You are given an array vaults of positive integers representing the amount in each vault along a r...
Compute build order from dependencies
Given a set of package build dependencies, output a valid build order so that each package is built only after all of its dependencies. The input is a...
Find earliest common slot
Given calendars for N attendees, each as a sorted list of non-overlapping, closed-open intervals [start, end) in minutes since epoch, and a required m...
Perform matrix Candy Crush elimination
Question Implement a function that, given an m × n integer matrix representing colored blocks (same integers = same color), performs one round of "Can...
Sort by squares and find k-th smallest
Given a nondecreasing sorted array of integers nums, do the following: 1) Reorder the original elements by increasing square value (equivalently, by a...
Determine Whether Queries Can Zero Array
You are given an integer array nums of length n and a list of range queries queries, where each query is of the form [l, r, val]. For a query [l, r, v...
Simulate views on an n-ary tree
Given a rooted, ordered n-ary tree (each node has a value and an ordered list of children), simulate an observer who starts at the bottom-left, moves ...
Implement uniform sampling in squares
Implement a class Square representing an axis-aligned square on the 2D plane that supports sampling a uniformly random point inside the square. Then e...
Count subarrays with ≥k identical pairs
Question LeetCode 2537. Count the Number of Good Subarrays – Given an integer array nums and an integer k, return the number of contiguous subarrays i...
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 ...
Find next and closest palindromes
Given a non-negative integer represented as a string n (no leading zeros unless n == "0"), return the smallest palindromic integer strictly greater th...
Count subarrays with at least k fruit pairs
Given an integer array nums where each value denotes a fruit type, and an integer k: For any subarray, define a 'pair' for fruit value v if its freque...
Design top-K tracker with linked lists
Design a data structure that tracks the top-K most frequent keys in a stream. Support operations increment(key), decrement(key), and topK(k) -> list o...
Solve two interview coding problems
The interview included two coding problems. Problem 1: Find valid robot locations in a grid You are given a 2D grid containing empty cells and obstacl...
Implement binary search from scratch
Implement binary search on a sorted integer array without using any library helpers. Return the index of the first occurrence of the target or -1 if a...