Community Tasks — Practice with Real Problems

Go medium Functions

Function for calculating the arithmetic mean and the number of elements greater than the mean

Write a function `AverageAndAbove` that takes a slice of integers and returns the arithmetic mean (type float64) and the…

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Python medium Functions

Function for compressing a list based on a condition

Write a function `compress_list` that takes a list of integers and a condition function (predicate). The function should…

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PHP medium Classes

Class for working with fractions

Create a class Fraction for working with ordinary fractions. The class must have methods for adding, subtracting, multip…

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Java medium Interfaces

Interface for processing numbers: Filtering and Transformation

Implement the NumberFilter and NumberTransformer interfaces with a single method boolean filter(int number) and int tran…

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C# easy Classes

Class Book: book description

Create a class Book with fields Title (string), Author (string), and Year (integer). Implement the PrintInfo() method, w…

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JavaScript easy Loops

Sum of numbers from A to B

Write a program that takes two integers A and B and uses a loop to calculate the sum of all integers from A to B inclusi…

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TypeScript easy Interfaces

Filtering by interface

Write a function `filterByInterface` that takes an array of objects and an interface (as a string) and returns a new arr…

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Python easy Loops

Sum of cubes

Write a program that finds the sum of cubes of all integers from 1 to N inclusive. It is guaranteed that N is positive a…

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Go easy Loops

Sum of squares of numbers from 1 to N

Write a program that reads a positive integer N and outputs the sum of squares of all integers from 1 to N inclusive. Us…

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PHP easy Functions

Sum of even numbers in a range

Write a function sumEven($start, $end) that takes two integers start and end (inclusive) and returns the sum of all even…

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Java easy Classes

Class Rectangle: area and perimeter

Create a class Rectangle with fields width and height. Implement a method for calculating the area and a method for calc…

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Rust easy Functions

Function for checking prime numbers

Write a function is_prime that takes a non-negative integer n and returns true if it is prime, and false otherwise. A pr…

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Swift easy Functions

Function for calculating the arithmetic mean

Write a function `average` that takes an array of integers and returns the arithmetic mean of these numbers (type Double…

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Kotlin easy Functions

Last digit of the square of a number

Write a function `lastDigitOfSquare(n: Int): Int` that takes a non-negative integer `n` and returns the last digit of th…

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C++ easy Pointers

Sum of array elements using pointers

Write a program that reads the size of an array and its elements, and then calculates the sum of all elements using poin…

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JavaScript hard Objects

Merging and restructuring nested objects with aggregation

Write a function that takes an array of objects with fields: id (number), parentId (number or null), name (string), and …

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Python hard Dictionaries

Reconstruction of department hierarchy based on subordination pairs

Given pairs of employee subordination in the format 'boss:subordinate'. It is necessary to restore the full hierarchical…

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Go hard Strings

Here is the translation of the programming task text from Russian to English: String compression with recovery by repetition rule

Given a string consisting of Latin alphabet letters (a-z) and digits (0-9). The string is encoded according to the follo…

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C# hard Loops

Cyclic shift and search for duplicate substrings

Given a string S consisting of lowercase Latin letters. It is necessary to perform a cyclic left shift of the string by …

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Java hard Loops

Here is the translation of the programming task text from Russian to English: Generating a sequence of numbers with a digital root

Write a program that generates a sequence of integers, starting from a given number N, and continues to add to the last …

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💡 Community Tasks