Rust
hard
Structs
Network monitoring: aggregation of packets with timestamps
Develop a Packet structure for storing network packet data: identifier (u32), size (u32), timestamp (u64, milliseconds).…
✅ 0 solved
📅 2026-05-11
C#
hard
LINQ
```html
LINQ: Data stream analysis with grouping and sliding window filtering
```
Write a C# program that reads a sequence of integers (at least 10). Using LINQ, perform an analysis: group the numbers b…
✅ 0 solved
📅 2026-05-11
Go
easy
Goroutines
Sum of squares of numbers with goroutines
Write a Go program that takes an integer n as input, followed by n integers. Create n goroutines, each of which calculat…
✅ 0 solved
📅 2026-05-11
Python
easy
Recursion
Sum of digits of a number using recursion
Write a recursive function that calculates the sum of digits of a natural number. The number is given as input. Use recu…
✅ 0 solved
📅 2026-05-11
Java
easy
Math
Sum of even numbers from 1 to N
Write a program that calculates the sum of all even numbers from 1 to a given number N inclusive. If N is less than 2, t…
✅ 0 solved
📅 2026-05-11
PHP
medium
Algorithms
Sorting an array by frequency of elements
Given an array of integers, it is necessary to sort it in descending order of element frequency. If two elements have th…
✅ 0 solved
📅 2026-05-11
JavaScript
easy
Closures
Closure-based call counter
Create a function `createCounter` that takes an initial value (an integer) and returns a new function. The returned func…
✅ 0 solved
📅 2026-05-11
C++
hard
Classes
Library Management System: searching for books by author and year
Implement the Book class, which stores the title, author, and year of publication. Then implement the Library class, whi…
✅ 0 solved
📅 2026-05-11
Swift
hard
Classes
Inheritance and polymorphism: a vehicle management system
Develop a class hierarchy for managing a fleet of vehicles. The base class Vehicle contains properties brand (String) an…
✅ 0 solved
📅 2026-05-11
Go
hard
Functions
Function for calculating the maximum sum of a subarray with a length constraint
Write a function `MaxSubarraySumWithLimit(nums []int, k int) int` that takes an integer array `nums` and an integer `k` …
✅ 0 solved
📅 2026-05-11
Python
hard
Functions
Function for finding the longest path in a binary tree
Given a binary tree, each node of which contains an integer. It is necessary to find the maximum sum of values on the pa…
✅ 0 solved
📅 2026-05-11
Rust
medium
Functions
Merge sort with a custom comparator
Write a function `merge_sort` that takes an array of integers and a comparator closure that determines the sort order. T…
✅ 0 solved
📅 2026-05-11
Kotlin
medium
Functions
Function for calculating the arithmetic mean of positive array elements
Write a function in Kotlin that takes an array of integers and returns the arithmetic mean of all positive elements in t…
✅ 0 solved
📅 2026-05-11
JavaScript
hard
Functions
Multi-level filtering and data aggregation using higher-order functions
Write a function `processData` that takes an array of objects (each object contains fields `category`, `value`, `active`…
✅ 0 solved
📅 2026-05-11
PHP
easy
Math
Sum of digits of a number
Write a program that calculates the sum of digits of a given natural number. The number can be large, so use a string re…
✅ 0 solved
📅 2026-05-11
C#
medium
Classes
Class "Vector" with operator overloading
Create a class `Vector3D` representing a three-dimensional vector. The class must contain fields X, Y, Z (integers). Imp…
✅ 0 solved
📅 2026-05-11
Go
medium
Loops
Compressing a sequence using a loop
Write a Go program that reads an integer N (1 ≤ N ≤ 100), then N integers. It should output a compressed sequence, repla…
✅ 0 solved
📅 2026-05-11
PHP
hard
Classes
Searching for the shortest path in a graph using classes
Implement the Graph class to represent a weighted directed graph. The class must contain the methods addEdge(int $from, …
✅ 0 solved
📅 2026-05-11
Python
medium
Loops
Sum of squares of prime numbers in a range
Given a natural number N. Find the sum of squares of all prime numbers from 2 to N inclusive. A prime number is a natura…
✅ 0 solved
📅 2026-05-11
TypeScript
medium
Interfaces
Interface for geometric shapes: calculating area and perimeter
Create a Shape interface that contains getArea() and getPerimeter() methods returning a number. Implement the Circle cla…
✅ 0 solved
📅 2026-05-11
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