Tech Interview Questions

Coding & AlgorithmsIntervals & Scheduling

Software EngineerSenior+

Earliest K-Minute Meeting Start from Text Schedules with Inclusive Busy Times

Everyone listed in a set of schedules must attend one meeting of k minutes. Each schedule entry is a string with four space-separated fields, a person...

Decode a Message of Letter-Scrambled Words Against a Known Word List

A message was encoded word by word: the letters inside each word were rearranged, while the order of the words and the single spaces between them were...

Coding & AlgorithmsMath & Number Theory

Count Index Triplets With an Even Product Modulo a Given Number

Given an integer array nums, count the triplets of indices (i, j, k) with i < j < k for which the product nums[i] nums[j] nums[k] is even. Because t...

Cursor-Based Text Editor: Typing, Backspace, and Four-Way Cursor Movement

Implement a TextEditor class that holds a text buffer and a single cursor. The editor starts empty, with the cursor at position 0. It supports three o...

Software Engineering FundamentalsData Structure Design

43 people solved

Oct 14, 2026

NVIDIALyftAppleGoogle

Hard

Coding & AlgorithmsData Structure DesignArrays & Strings

Read a Character Stream across Repeated Requests

Read a Character Stream across Repeated Requests A hidden file is available only through read4(buf4). Implement Solution.read(buf, n) to copy up to n ...

23 people solved

Harvey

Coding & AlgorithmsArrays & StringsData Structure Design

Software Engineer Locked

Allocate Unique File Names in an In-Memory Vault

Allocate unique vault file names with the smallest available numeric suffix, handling preexisting suffixes, repeated requests, and case sensitivity.

Reconstruct Each User's Journey from Unordered Activity Logs

An app writes one log entry for every user action, and the entries reach you in no particular order. Each entry records which user acted, when, and wh...

Coding & AlgorithmsSorting

Choose a bit string with at most maxSet ones to maximize its XOR with x

You are given a binary string x of length bits, written with the most significant bit first, and an integer maxSet. Construct a binary string y of the...

Coding & AlgorithmsBit ManipulationGreedy

Software EngineerIntern Locked

Merge K Timestamp-Sorted Price Feeds into a Running Absolute Price

Merge K price-event feeds, each already sorted by timestamp, into one chronological stream and return the running absolute price after every event, st...

Coding & AlgorithmsHeaps & Priority Queues

347 people solved

Sep 20, 2026

SnowflakeLinkedInAmazon

Software Engineering FundamentalsData Structure DesignTesting & Quality

Multiset with O(1) Insert, Remove, and Count-Weighted Random Pick

Design a data structure that holds a collection of integers in which duplicates are allowed, and that supports each of the following operations in ave...

48 people solved

Amazon

Software EngineerSenior+

Reverse the Characters of an ASCII String

Write a function that returns a string with its characters in reverse order. The report names this warm-up only as reversing a string. This version fi...

JPMorgan ChaseBloombergDoorDash

9 people solved

Oct 31, 2026

Fewest Replacements Making One String an Anagram

Problem The lowercase strings s and t have equal length. One operation replaces any character of t with another character. Return the minimum operatio...

43 people solved

Vanta

Software Engineer Locked

Keep the First Occurrence of Every Globally Unique Line

Remove repeated lines globally while preserving first-occurrence order, exact case, spaces, and empty lines.

Coding & AlgorithmsLinked ListsData Structure Design

Software Engineer Locked

Implement Get and Insert in an Unrolled Linked List

Implement indexed get and insert in an unrolled linked list, preserving block capacity, occupancy, sequence order, and split behavior.

Make k Cuts in a Row of Positive Values to Maximize the Smallest Piece Sum

You are given an array sweetness of positive integers describing consecutive chunks of a bar, and an integer k. Make exactly k cuts to split the bar i...

Coding & AlgorithmsBinary SearchGreedy

Count Subarrays Containing at Least k Disjoint Pairs of Equal Values

Fruits travel along a conveyor belt, and fruits[i] is the type of the i-th fruit, written as an integer. For a contiguous segment of the belt, a pair ...

Coding & AlgorithmsTwo Pointers & Sliding Window

Enumerate All Contiguous Palindrome Cut Choices

Problem Return every partition of s into nonempty contiguous pieces such that each piece is a palindrome. Pieces must concatenate to the original stri...

Coding & AlgorithmsBacktracking & RecursionArrays & Strings

23 people solved

Visa

Hard

Software EngineerSenior+

Minimize Completion Time with Specialized Workers

There are n workers and m tasks. Each task has one designated proficient worker. That worker takes one hour to perform it; any other worker takes two ...

Coding & AlgorithmsBinary SearchIntervals & Scheduling

16 people solved

Oct 17, 2026

GoogleAmazonBloomberg

Easy

Measure the Final Word Before Trailing Spaces

Problem Given the string s, return the length of its final word. A word is a maximal contiguous sequence of characters other than the ordinary space c...

26 people solved

Retell AI