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coding
Medium
Verified Question
#1
1. Move Through Array
Category: Array coding problem# Move Through Array You are given an array where each element represents the number of steps you can move from that position. Positive numbers move...Input: Array
Output: Computed result
coding
Hard
Verified Question
#2
2. OA [CodeSignal] Adventure Levels
Category: Array coding problem# OA [CodeSignal] Adventure Levels You start with initial energy
K. You need to clear a series of adventure levels. For each level i: -...Input: ArrayOutput: Array
coding
Hard
Verified Question
#3
3. OA [CodeSignal] Balanced Numbers in Permutation
Category: Array coding problem# OA [CodeSignal] Balanced Numbers in Permutation Given a permutation
p of integers from 1 to n. A number k (where 1 <= k <= n) is called...Input: ArrayOutput: Computed result
coding
Hard
Verified Question
#4
4. OA [CodeSignal] Count Palindrome Paths in Tree
Category: Tree coding problemGiven a tree with
n nodes where each node has a lowercase English character c[i]. A path is palindromic if the characters along the path can...Input: ListOutput: Computed result
coding
Medium
Verified Question
#5
5. OA [CodeSignal] Final Prices After Discount
Category: Array coding problemYou are given an array
prices where prices[i] is the price of an item. For each item at index i, find the first item at index j > i such that...Input: ArrayOutput: Computed result
coding
Medium
Verified Question
#6
6. OA [CodeSignal] Jump Game
Category: Array coding problemYou are at position
i in an array. From each position, you can jump to: - i + 1 (one step forward) - Any position i + k where k ends in digit...Input: ArrayOutput: Computed result
coding
Medium
Verified Question
#7
7. OA [CodeSignal] Longest Subsequence With Limited Sum
Category: Array coding problemYou are given two arrays:
nums (containing positive integers) and queries (each containing a target sum). For each query, return the maximum...Input: ArrayOutput:** Computed result
coding
Hard
Verified Question
#8
8. OA [CodeSignal] Max Throughput With Budget
Category: Algorithm coding problemYou have a pipeline of services. Each service has: - Current throughput
throughput[i] - Cost to scale up by 1 unit scalecost[i] You have a fixed...Input: ListOutput: Integer
coding
Hard
Verified Question
#9
9. OA [CodeSignal] Minimum Edge Reversal Root
Category: Graph coding problemGiven a directed graph (represented as a tree with directed edges), choose a root node such that the minimum number of edges must be reversed so that...Input: Graph (nodes and edges)
Output: Integer
coding
Medium
Verified Question
#10
10. OA [CodeSignal] Minimum Operation To Reduce n To 0
Category: Algorithm coding problemGiven a positive integer
n, in one operation you may replace n with either: - n = n + 2^i, or - n = n - 2^i for any integer i >= 0. Find...Input: Integer(s)Output: Integer
coding
Hard
Verified Question
#11
11. OA [CodeSignal] Purchase Optimization
Category: Array coding problemAlex is shopping at Ozone Gallerie Mall where cubicles are arranged in non-decreasing order of prices from left to right. Given: -
prices: array of...Input: ArrayOutput: Integer
coding
Medium
Verified Question
#12
12. OA [CodeSignal] Shortest Good Subarray
Category: Array coding problemGiven an array
arr and an integer k, a subarray is called good if it contains at least k distinct integers. Return the length of the...Input: ArrayOutput: Integer
coding
Hard
Verified Question
#13
13. OA [CodeSignal] Touring the Building
Category: Algorithm coding problemYou are on floor 0 of a building and need to reach floor
n. You can use either the lift or stairs. Lift: - Takes t1 time per floor -...Input: Given inputOutput: Computed result
coding
Medium
Verified Question
#14
14. Robot Map
Category: Array coding problemGiven a location map and a query, find which robot matches the query. Location Map: A 2D array where each cell contains: -
O = Robot - E =...Input: ArrayOutput: Computed result
coding
Hard
Verified Question
#15
15. [Low Level Design] Uber Eats Price Calculation
Category: Algorithm coding problemIn the Uber Eats marketplace, the final price of an order is a dynamic calculation involving multiple factors. Design the core classes and interfaces...Input: Given input
Output: Computed result
coding
Medium
Verified Question
#16
16. [Object Oriented Design] Meeting Reservation System
Category: Interval-based coding problem# Meeting Reservation System Design a meeting reservation system that manages meeting rooms and schedules. Implement a
MeetingReservationSystem...Input: Integer(s)Output: Computed result
coding
Hard
Verified Question
#17
17. Capital Gains Tax Calculator
Category: String coding problemYou are given a chronologically sorted list of stock transactions. Each transaction is a list of strings in the format `[<timestamp>, <type>,...Input: Array of strings
Output: Computed result
coding
Medium
Verified Question
#18
18. Unimodal Cost Function Minimum
Category: Interval-based coding problem# Unimodal Cost Function Minimum You are given a unimodal cost function
f(x) = A * (x - C)^2 + D defined over the interval [lo, hi], where `A >...Input: Given inputOutput: Computed result
coding
Medium
Verified Question
#19
19. Hierarchy Path Finder
Category: Tree coding problem# Hierarchy Path Finder You are given an org chart represented as a tree. Each node in the tree has a unique integer ID and a display name. You are...Input: List
Output: Computed result
coding
Medium
Verified Question
#20
20. Weight Partition Check
Category: Algorithm coding problem# Weight Partition Check You are given a list of distinct positive integer weights and a capacity value. Determine whether any subset of the weights...Input: List
Output: Computed result
coding
Medium
Verified Question
#21
21. Straight Line Sequence Search
Category: Grid/matrix coding problem# Straight Line Sequence Search You are given an
m x n grid of characters and a target sequence string. Determine whether the sequence appears in...Input: 2D gridOutput: Computed result
coding
Hard
Verified Question
#22
22. Longest Valid Container Nesting
Category: String coding problem# Longest Valid Container Nesting You are given a string consisting only of the characters
{, }, [, ], (, ). These represent three levels...Input: StringOutput: Integer
coding
Medium
Verified Question
#23
23. Next Palindrome Number
Category: String coding problem# Next Palindrome Number Given a string
num representing a positive integer, find and return the smallest palindrome that is strictly greater than...Input: StringOutput: Computed result
coding
Easy
Verified Question
#24
24. Annotate First Pattern Match
Category: String coding problem# Annotate First Pattern Match You are given a string
text containing words separated by spaces, and a list of patterns. For each word in text,...Input: ListOutput: Computed result
coding
Medium
Verified Question
#25
25. Nested Arithmetic Expression Evaluator
Category: String coding problem# Nested Arithmetic Expression Evaluator You are given a string expression containing nested calls to two functions:
plus(a, b) and minus(a, b)....Input: StringOutput: Computed result
coding
Medium
Verified Question
#26
26. Process CPU Time Calculator
Category: Interval-based coding problemYou are given a list of log entries from a single-threaded CPU scheduler. Each entry is a list of three strings:
[process_name, action, timestamp],...Input: Array of stringsOutput: Computed result
coding
Medium
Verified Question
#27
27. OA [CodeSignal] Prime Jumps
Category: Algorithm coding problem# OA [CodeSignal] Prime Jumps A game is played with the following rules: - A player starts at cell 0 with a score of 0. - There is a row of
n cells...Input: Number(s)Output: Computed result
coding
Hard
Verified Question
#28
28. Palindrome Paths From Query
Category: Tree coding problem# Palindrome Paths From Query A disk stores hierarchical data in an undirected tree with
tree_nodes nodes numbered from 0 to tree_nodes - 1,...Input: ArrayOutput: Computed result
coding
Hard
two pointers
#1
1. [OA] Two Pointers — Find overlapping ride requests during peak hours
During busy times, Uber may receive overlapping ride requests that affect driver availability. We need to identify these to optimize vehicle distribution.
Problem statement: Given two arrays representing the start and end times of ride requests, determine how many requests overlap at any point in time.
Method Signature:
-
Input:
Output:
Explanation: The requests at indices 0 and 1 overlap.Example 2:
Input:
Output:
Explanation: All ride requests overlap.Constraints:
-
-
Problem statement: Given two arrays representing the start and end times of ride requests, determine how many requests overlap at any point in time.
Method Signature:
-
countOverlaps(start: number[], end: number[]): number — Returns the total count of overlapping ride requests.Example 1:Input:
start = [1, 2, 3], end = [2, 3, 4]Output:
2Explanation: The requests at indices 0 and 1 overlap.Example 2:
Input:
start = [1, 10, 5], end = [5, 15, 8]Output:
3Explanation: All ride requests overlap.Constraints:
-
1 <= start.length == end.length <= 1000-
1 <= start[i] < end[i] <= 10000
coding
Medium
sliding window
#2
2. [OA] Sliding Window — Implement a dynamic pricing calculator for Uber's ride service
Uber dynamically adjusts ride prices based on demand and availability. This requires a system to efficiently keep track of ride request milestones over time to optimize pricing.
Problem statement: You need to implement a method that computes the average price over the last
Method Signature:
-
Input:
Output:
Explanation: The last three prices are 30, 40, and 50; their average is 40.Example 2:
Input:
Output:
Explanation: The last two prices are 15 and 25; their average is 20.Constraints:
-
-
-
Problem statement: You need to implement a method that computes the average price over the last
k time intervals given an array of ride prices and an integer k. Ensure that the function correctly handles edge cases with array boundaries.Method Signature:
-
calculateAverage(prices: number[], k: number): number — Returns the average price over the last k ride prices.Example 1:Input:
prices = [10, 20, 30, 40, 50], k = 3Output:
40Explanation: The last three prices are 30, 40, and 50; their average is 40.Example 2:
Input:
prices = [5, 15, 25], k = 2Output:
20Explanation: The last two prices are 15 and 25; their average is 20.Constraints:
-
1 <= prices.length <= 10000-
1 <= prices[i] <= 1000-
1 <= k <= prices.lengthRelated Uber Frontend Engineer interview prep
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