README.md

problems

Programming questions solved in JavaScript

Arrays

• Returns continous largest sum
• Finds kth largest element in an array of integers
• Finds sum of numbers falling inside a given rectangle area for a given matrix of integers
• Finds the maximum product from a contiguous sub array in a given array
• Implements merge sort
• Returns all pairs that sum up to a specific value in an integer array

Strings

• Given two strings finds out whether one is permutaiton of the other
• Verifies whether str3 is a valid shuffle of str2 and str1
• Simple string compression using the count of repeated characters
• Determines whether a string has all unique characters (ASCII)
• Searches a word in a dictionary

Linked Lists

• Returns the node at the begging of loop of a circular linked list
• Checks whether a linked list is a plaindrome
• Checks whether a linked list is cycle or has loop
• Finds kth last element of a singly linked list
• Modifies a linked list such that all nodes less than a value x comes before all nodes greater than or equal to x
• Adds two numbers represented by linked list where each node contains a single digit

Queues and Stacks

• animal shelter operation
• Implements a queue with two stacks
• Implements a single stack composed of several stacks limited by capacity
• Sorts a stack in ascending order
• Move disks from first tower to last tower in Towers of Hanoi problem

Trees

• Binary search tree verification
• Create binary search tree from sorted array
• Creates a linked list of all the nodes at each depth for a given binary tree
• Find in order successor of a node in BST
• Finds common ancestor of two nodes in a binary tree
• Return all paths in a binary tree which sum to a given value
• Checks whether a binary tree is blanced
• Checks whether a tree T2 is a subtree of tree T1

Graphs

• Finds out whether a route between two nodes in a graph

Bit Operations

• Number bits need to be changed to convert number A to number B
• Find missing number in tow given nun negative integer arrays where one array is formed by shuffling the elements of the first array and deleting a random element
• Returns next smallest and the next largest number that have the same number of 1 bits in their binary representation
• Inserts number M into number N such that M starts at bit j and ends at bit i
• Determines whether a string has all unique characters (ASCII)
• Swaps odd and even bits in an integer

Recusrion

• Binary search tree verification
• Create binary search tree from sorted array
• Find in order successor of a node in BST
• Finds common ancestor of two nodes in a binary tree
• Generate all valid pairs of parentheses for given count
• Checks whether a linked list is a plaindrome
• Checks whether a binary tree is blanced
• Finds kth largest element in an array of integers
• Finds kth last element of a singly linked list
• Checks whether a tree T2 is a subtree of tree T1

Breadth First Search

• Creates a linked list of all the nodes at each depth for a given binary tree
• Finds out whether a route between two nodes in a graph

Misc

• Find binary string of a real number between 0 and 1