Given an integer array arr and an integer difference, return the length of the longest subsequence in arr which is an arithmetic sequence such that th ...

We are given hours, a list of the number of hours worked per day for a given employee. A day is considered to be a tiring day if and only if the numbe ...

You are a hiker preparing for an upcoming hike. You are given heights, a 2D array of size rows x columns, where heights[row][col] represents the heigh ...

Given the array nums consisting of n positive integers. You computed the sum of all non-empty continous subarrays from the array and then sort them in ...

Given an array of integers arr. We want to select three indices i, j and k where (0 <= i < j <= k < arr.length). Let’s define a and b as f ...

Given an array of integers nums and an integer limit, return the size of the longest non-empty subarray such that the absolute difference between any ...

Design and implement a data structure for Least Frequently Used (LFU) cache. Implement the LFUCache class: LFUCache(int capacity) Initializes the obj ...

Design a data structure that supports all following operations in average O(1) time. insert(val): Inserts an item val to the collection. remove(val): ...

Implement the RandomizedSet class: bool insert(int val) Inserts an item val into the set if not present. Returns true if the item was not present, fa ...

Implement a data structure supporting the following operations: Inc(Key) - Inserts a new key with value 1. Or increments an existing key by 1. Key is ...