PHP
hard
Loops
Search for the maximum subarray sum with a length condition in a circular array
Given a cyclic integer array of length N (N ≤ 10^5). Find the maximum sum of a contiguous subarray of length at least L …
✅ 0 solved
📅 2026-05-11
Kotlin
hard
Loops
Search for the maximum subarray sum after a cyclic shift
Given an array of integers. It is allowed to perform exactly one cyclic shift to the left (the first element becomes the…
✅ 0 solved
📅 2026-05-11
TypeScript
hard
Loops
Search for the maximum subarray sum considering negative elements and cyclic shift
Given an array of integers, find the maximum sum of a subarray (contiguous sequence of elements) after performing at mos…
✅ 0 solved
📅 2026-05-11
Swift
hard
Loops
Search for the maximum path in a number triangle
Given a triangle of integers. Find the maximum sum of numbers on a path from the top to the base, moving each step one r…
✅ 0 solved
📅 2026-05-11
C++
hard
Loops
Gray Code: Cyclic Shift and XOR
Given an integer N (1 ≤ N ≤ 20). Generate a sequence of 2^N numbers representing the Gray code for numbers from 0 to 2^N…
✅ 0 solved
📅 2026-05-11
Rust
hard
Loops
Cyclic shift of a matrix with maximization of the diagonal sum
Given a square matrix of integers of size N x N. In one move, you can cyclically shift any row left or right by an arbit…
✅ 0 solved
📅 2026-05-11
Go
medium
Maps
Frequency analysis of words in a text
Write a program that reads text from multiple lines, counts the frequency of each word (case-insensitive), and outputs t…
✅ 0 solved
📅 2026-05-11
Python
medium
Lists
Search for a pair with the maximum sum in a list
Given a list of integers, find two different elements of the list (with different indices) whose sum is maximum. If ther…
✅ 0 solved
📅 2026-05-11
Kotlin
medium
Strings
Removing duplicate characters while preserving order
Write a program that takes a string containing only lowercase Latin letters and removes all duplicate characters from it…
✅ 0 solved
📅 2026-05-11
C#
medium
Strings
Checking the balance of parentheses in a string
Given a string containing the characters '(' and ')', as well as other characters. It is necessary to check whether the …
✅ 0 solved
📅 2026-05-11
Rust
medium
Strings
Counting vowels in strings with palindrome check
Write a program that takes a string and counts the number of vowel letters (a, e, i, o, u, y) in it, ignoring case. Then…
✅ 0 solved
📅 2026-05-11
TypeScript
medium
Strings
Substring access by indices
Given a string S and two integers a and b (indices). It is necessary to reverse the substring from index a to b inclusiv…
✅ 0 solved
📅 2026-05-11
JavaScript
medium
Strings
Removing duplicate characters while preserving order
Given a string consisting of lowercase Latin letters. It is necessary to remove all duplicate characters, leaving only t…
✅ 0 solved
📅 2026-05-11
Java
medium
Strings
Search for the longest palindromic substring in a string
Given a string consisting of lowercase Latin letters. Find and output the longest subpalindrome (a substring that reads …
✅ 0 solved
📅 2026-05-11
Swift
medium
Strings
Counting the number of unique substrings
Given a string S consisting of lowercase Latin letters. It is necessary to count the number of distinct substrings in th…
✅ 0 solved
📅 2026-05-11
C++
medium
Strings
Search for the longest substring without repeating characters
Given a string consisting of lowercase Latin letters. It is necessary to find the length of the longest substring in whi…
✅ 0 solved
📅 2026-05-11
PHP
medium
Strings
Search for the longest palindrome in a string
Write a function that takes a string and finds the longest palindromic substring. If there are several, return the first…
✅ 0 solved
📅 2026-05-11
JavaScript
easy
Arrays
Arithmetic mean of array elements
The input is an array of integers. It is necessary to calculate the arithmetic mean of all elements of the array. If the…
✅ 0 solved
📅 2026-05-11
Swift
easy
Arrays
Sum of array elements
Given an array of integers. Write a program that calculates the sum of all elements of the array. The array is entered f…
✅ 0 solved
📅 2026-05-11
Rust
easy
Vectors
Sum of vector elements
Write a program that reads the number of elements and the vector of integers itself, and then calculates the sum of all …
✅ 0 solved
📅 2026-05-11
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