Problem Statement Given a 1-indexed array of integers numbers that is already sorted in non-decreasing order, find two numbers such that they add up to a specific target number. Let these two numb...

Problem Statement A string is considered a palindrome if, after converting all uppercase letters to lowercase and removing all non-alphanumeric characters, it reads the same forward and backward. ...

Problem Statement Design an algorithm to encode a list of strings to a single string. The encoded string should be able to be decoded back into the original list of strings. You need to: Imple...

Problem Statement Determine if a 9 x 9 Sudoku board is valid. The board is considered valid if: Each row contains the digits 1-9 without repetition. Each column contains the digits 1-9 withou...

Problem Statement Given an unsorted array of integers nums, return the length of the longest consecutive elements sequence. The algorithm should run in O(n) time complexity. Solve Here: Longest ...

Problem Statement Given an integer array nums, return an array answer such that answer[i] is equal to the product of all the elements of nums except nums[i]. Solve Here: Product of Array Except S...

Problem Statement Given an integer array nums and an integer k, return the k most frequent elements. You may return the answer in any order. Solve Here: Top K Frequent Elements Examples: ...

Sorting is a fundamental operation in problem-solving. Kotlin provides a rich set of sorting functions in its standard library, making it easy to sort various data structures efficiently. Sorting ...

Problem Statement Given an array of strings strs, group the anagrams together. You can return the answer in any order. Solve Here: Group Anagrams Examples Input Output ...

Problem Statement Given an array of integers nums and an integer target, return the indices of the two numbers such that they add up to target. Each input will have exactly one solution. You...