Applied Coding & Algorithms Interview Questions
Practice the exact questions companies are asking right now.
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Find intersection of two line segments
Problem Given two 2D line segments AB and CD, determine whether they intersect. Each segment is defined by its endpoints: - A(x1, y1), B(x2, y2) - C(x...
Scale Game of Life to huge matrices
You are given starter code for computing one step of a Game of Life–style cellular automaton on a binary grid, but the naive implementation loads the ...
Merge overlapping 2D line segments
You are given a list of 2D line segments. Each segment is represented as a list of 2D points [(x1,y1), (x2,y2), ...] that all lie on the same straight...
Track simulations and report timeouts
You are implementing a monitoring component for many concurrent simulations. Each simulation produces a stream of event objects of the form: - sim_id ...
Merge collinear overlapping 2D segments
You are given a collection of 2D line segments. Each segment may be represented either as: - two endpoints (x1, y1) and (x2, y2), or - a polyline with...
Build message schema parser with size/type queries
You are given a text definition of a message schema and a table of primitive types with their byte sizes. Implement a parser and expose two query func...
Evaluate variables in simple arithmetic DSL
You are given a small DSL (domain-specific language) consisting of variable assignments, one per line. Each line has the form: `text <identifier> = <e...
Validate JSON against a protobuf-like schema
You are given a simplified protobuf-like schema definition and a JSON value. Determine whether the JSON conforms to the schema. Schema model - A schem...
Implement a single-thread task scheduler API
Design and implement a simple task scheduler for a single CPU, single thread environment. You need to support scheduling callbacks (tasks) using the f...
Compress vertices into uniques and indices
You are given an array of vertices (a 2D array). Each vertex may repeat. Implement a simple “compression” that produces: 1. unique_vertices: the list ...
Parse a protobuf-like schema and answer queries
You are given a single string schema describing message types in a simplified, protobuf-like language. Your task is to parse the schema and support tw...
Find first and last occurrence in sorted array
Problem You are given an array of integers nums sorted in non-decreasing order and an integer target. Return a pair of indices [first, last] such that...
Group duplicate files by content
Problem You are given a list of files in a filesystem. Each file has: - a full path (string) - a file size in bytes (integer) - file contents (concept...
Implement a fixed-capacity generic circular buffer
Design a data structure that stores generic elements T with the following properties: - FIFO semantics (queue): pop() returns the oldest element. - pu...