## LRU Cache LeetCode Solution

Question Design a data structure that follows the constraints of a Least Recently Used (LRU) cache. Implement the LRUCache class: LRUCache(int capacity) Initialize the LRU cache with positive size capacity. int get(int key) Return the value of the key if the key exists, otherwise return -1. void put(int key, int value) Update the value of the key if the key exists. Otherwise, add the key-value pair to …

## Contiguous Array

Given an array consisting of number 0’s and 1’s only. We have to find the length of the longest contiguous sub-array consisting o’s and 1’s equally. Example Input arr = [0,1,0,1,0,0,1] Output 6 Explanation The longest contiguous sub-array is marked in red [0,1,0,1,0,0,1] and its length is 6. Algorithm Set …

## Convex Hull Algorithm

In problem “Convex Hull Algorithm” we have given a set of some points. The smallest polygon that can be formed with those points which contain all other points inside it will be called its convex hull. This can be achieved by using Jarvis Algorithm. Algorithm Initialize a leftmost point to …

## Best Time to Buy and Sell Stock  II Leetcode Solution

Problem statement In the problem “Best Time to Buy and Sell Stock  II,” we are given an array where each element in the array contains the price of the given stock on that day. The definition of the transaction is buying one share of stock and selling that one share …

## Inorder Successor of a node in Binary Tree

Problem Statement The problem asks to find “Inorder Successor of a node in Binary Tree”. An inorder successor of a node is a node in the binary tree that comes after the given node in the inorder traversal of the given binary tree. Example Inorder successor of 6 is 4 …

## Iterative Preorder Traversal

The problem “Iterative Preorder Traversal” states that you are given a binary tree and now you need to find the preorder traversal of the tree. We are required to find the preorder traversal using iterative method and not the recursive approach. Example   5 7 9 6 1 4 3 …

## Boundary Traversal of binary tree

Problem Statement The problem “Boundary Traversal of binary tree” states that you are given a binary tree. Now you need to print the boundary view of a binary tree. Here boundary traversal means that all the nodes are shown as the boundary of the tree. The nodes are seen from …

## Letter Combinations of a Phone Number

In letter combinations of a phone number problem, we have given a string containing numbers from 2 to 9. The problem is to find all the possible combinations that could be represented by that number if every number has some letters assigned to it. The assignment of the number is …

## Longest Substring Without Repeating Characters LeetCode Solution

Longest Substring Without Repeating Characters LeetCode Solution – Given a string, we have to find the length of the longest substring without repeating characters. Let’s look into a few examples: Example pwwkew 3 Explanation: Answer is “wke” with length 3 aav 2 Explanation: Answer is “av” with length 2 Approach-1 …

## Painting Fence Algorithm

Problem Statement The “Painting Fence Algorithm” states that you are given a fence having some posts (some wooden pieces or some other pieces) and some colors. Find out the number of ways to paint the fence such that at most only 2 adjacent fences have the same color. Since this …