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Arrays Backtracking Hash

Given an array A[] and a number x, check for pair in A[] with sum as x

Write a program that, given an array A[] of n numbers and another number x, determines whether or not there exist two elements in S whose sum is exactly x. ...
Linked List Accolite Amazon

Write a function to get the intersection point of two Linked Lists.

There are two singly linked lists in a system. By some programming error, the end node of one of the linked list got linked to the second list, forming an inverted Y...
Arrays Linked List Accolite

Add two numbers represented by linked lists Set 2

Given two numbers represented by two linked lists, write a function that returns sum list. The sum list is linked list representation of addition of two input numbers...
Binary Search Tree Tree Accolite

A program to check if a binary tree is BST or not

A binary search tree (BST) is a node based binary tree data structure which has the following properties. • The left subtree of a node contains only nodes with...
Queue Recursion Stack

Level order traversal in spiral form

Write a function to print spiral order traversal of a tree. For below tree, function should print 1, 2, 3, 4, 5, 6, 7. Recommended: Please solve it on “PRAC...
Tree Accolite Adobe

Root to leaf path sum equal to a given number

Given a binary tree and a number, return true if the tree has a root-to-leaf path such that adding up all the values along the path equals the given number. Return fa...
Tree Accolite Amazon

Lowest Common Ancestor in a Binary Tree Set 1

Given a binary tree (not a binary search tree) and two values say n1 and n2, write a program to find the least common ancestor. Following is definition of LCA from W...
Dynamic Programming Strings Accolite

Longest Palindromic Substring Set 1

Given a string, find the longest substring which is palindrome. For example, if the given string is “forgeeksskeegfor”, the output should be “g...
Arrays Dynamic Programming Matrix

Maximum sum rectangle in a 2D matrix DP-27

Given a 2D array, find the maximum sum subarray in it. For example, in the following 2D array, the maximum sum subarray is highlighted with blue rectangle and sum of...
Backtracking Combinatorial Greedy

Write a program to print all permutations of a given string

A permutation, also called an “arrangement number” or “order,” is a rearrangement of the elements of an ordered list S into a one-to-one c...

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