C#
hard
Async
Asynchronous data analysis with concurrency limit
Develop an asynchronous console application that reads from stdin the number N, then N lines, each line containing an in…
✅ 0 solved
📅 2026-05-11
TypeScript
hard
Async
Parallel data fetching with error handling and timeouts
Implement an asynchronous function `fetchWithTimeout` that takes an array of URLs (strings) and a timeout in millisecond…
✅ 0 solved
📅 2026-05-11
Swift
hard
Protocols
Protocols and Dynamic Dispatch
Implement a data serialization processing system based on protocols. Define the `Serializable` protocol with the require…
✅ 0 solved
📅 2026-05-11
Kotlin
hard
Lambdas
Multi-level filtering and aggregation of data using lambda expressions
Write a program in Kotlin that reads a list of strings from standard input. Each string contains numbers separated by sp…
✅ 0 solved
📅 2026-05-11
Python
hard
Classes
Network of binary search trees with inheritance and polymorphism
Implement the `Node` class for a binary search tree (BST) node with `insert`, `search`, and `delete` methods. Create the…
✅ 0 solved
📅 2026-05-11
C#
medium
Delegates
Order processing with delegates for filtering and sorting
Implement a program for processing a list of orders. You have an Order class with fields Id (int), CustomerName (string)…
✅ 0 solved
📅 2026-05-11
Rust
hard
Iterators
Compressing a sequence using iterators and combinators
You are given a sequence of integers. You need to implement a function that compresses the sequence: replaces consecutiv…
✅ 0 solved
📅 2026-05-11
Java
hard
Streams
Multithreaded processing of data streams with grouping and filtering
Write a program that reads from standard input lines containing integers separated by spaces. Each line represents a sep…
✅ 0 solved
📅 2026-05-11
TypeScript
medium
Types
Type conversion in TypeScript
Write a function that takes a string containing integers separated by spaces. It is necessary to convert the string into…
✅ 0 solved
📅 2026-05-11
Go
hard
Interfaces
Multi-level access verification system with interfaces
Implement a resource access checking system using interfaces. Define an AccessChecker interface with methods CheckAccess…
✅ 0 solved
📅 2026-05-11
C++
hard
STL
Finding the longest path in a graph using STL and topological sorting
Given a directed acyclic graph (DAG) with N vertices and M edges. Each edge has an integer weight (can be negative). It …
✅ 0 solved
📅 2026-05-11
Swift
medium
Structs
Structure for managing a book library
Create a structure `Book` with fields `title` (String), `author` (String), `year` (Int), and `isAvailable` (Bool). Imple…
✅ 0 solved
📅 2026-05-11
Kotlin
medium
Extensions
Extension for counting unique words with case-insensitive ignoring
Write a Kotlin program that reads a string of text and uses an extension function for String to count the number of uniq…
✅ 0 solved
📅 2026-05-11
Rust
medium
Traits
Trait Geometry for calculating area and perimeter
Implement the Geometry trait with methods area() -> f64 and perimeter() -> f64. Create structures Circle (radius), Recta…
✅ 0 solved
📅 2026-05-11
TypeScript
easy
Algorithms
Sorting by string length
The input is a number n, followed by n lines. Sort the lines by increasing length. If the lengths are equal, preserve th…
✅ 0 solved
📅 2026-05-11
Python
medium
Arrays
Intersection of Sets with Duplicates
Two strings containing integers separated by spaces are given. It is necessary to find all numbers that appear in both s…
✅ 0 solved
📅 2026-05-11
C#
easy
Generics
Generalized method for finding the maximum in an array
Implement a generic method Max that takes an array of elements of type T and returns the maximum element. The type T mus…
✅ 0 solved
📅 2026-05-11
Java
medium
Generics
Generic stack with type constraint
Implement a parameterized class GenericStack, which represents a stack of numbers (Integer, Double, etc.). The class mus…
✅ 0 solved
📅 2026-05-11
Kotlin
easy
Algorithms
Sorting by the last digit
Write a program that reads an array of integers and sorts it in ascending order by the last digit of the numbers. If the…
✅ 0 solved
📅 2026-05-11
JavaScript
hard
Promises
Asynchronous chain with timeouts and priorities
Implement the function asyncChain(tasks, timeout), which takes an array of tasks (functions returning promises) and a ti…
✅ 0 solved
📅 2026-05-11
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