Majority Element- Boyer–Moore majority vote algorithm
Objective: Given an array of integer write an algorithm to find the majority element in it (if exist). Majority Element: If an element appears more than n/2 times in array where n is the size...
Tagged: Intermediate
Find the local minima in a given array
Objective: Given an array of integer write an algorithm to find the local minima. Local Minima: An element is considered as local minima if it is less than both of its neighbors (if neighbors exist)....
Maximum difference between two elements where larger element appears after the smaller element
Objective: Given an array A[], write an algorithm to find Maximum difference between two elements where larger element appears after the smaller element or in other words find A[i] and A[j] such that A[j]-A[i]...
Find the two repeating elements in a given array | 6 Approaches
Objective: Given an array of n+2 elements. All elements of the array are in range 1 to n and all elements occur once except two numbers which occur twice. Write an algorithm to find...
Find two elements whose sum is closest to zero
Objective: Given an array of positive and negative integers, write a algorithm to find the two elements such their sum is closest to zero. Example: int a [] = {1, 4, -5, 3, -2,...
Find the element which appears maximum number of times in the array.
Objective: Given an array of integers, write a algorithm to find the element which appears maximum number of times in the array. Example: int [] arrA = {4, 1, 5, 2, 1, 5, 9,...
Find duplicates in an given array in O(n) time and O(1) extra space.
Objective: Given an array of integers, find out duplicates in it. Example: int [] a = {4, 6, 2, 1, 2, 5}; Output: Array has duplicates : 2 int a [] = {1, 6,...
Find longest Snake sequence in a given matrix
Objective: Given two dimensional matrix, write an algorithm to find out the snake sequence which has the maximum length. There could be many snake sequence in the matrix, you need to return the one...
Dynamic Programming – Count all paths in 2D Matrix with Obstructions in it
Objective: Given two dimensional matrix, write an algorithm to count all possible paths from top left corner to bottom-right corner. You are allowed to move only in two directions, move right OR move down....
Dynamic Programming – Count all paths from top left to bottom right of a mXn matrix
Objective: Given two dimensional matrix, write an algorithm to count all possible paths from top left corner to bottom-right corner. You are allowed to move only in two directions, move right OR move down....
Print All Diagonals of a given matrix
Objective: Given two dimensional matrix, write an algorithm to print all the diagonals of matrix. Example: Approach: We will solve this problem in two parts. first half of diagonals and second half of diagonals....
Dynamic Programming – Maximum Subarray Problem
Objective: The maximum subarray problem is the task of finding the contiguous subarray within a one-dimensional array of numbers which has the largest sum. Example: int [] A = {−2, 1, −3, 4, −1, 2, 1, −5,...
Kadane’s Algorithm – Maximum Subarray Problem
Objective: The maximum subarray problem is the task of finding the contiguous subarray within a one-dimensional array of numbers which has the largest sum. Example: int [] A = {−2, 1, −3, 4, −1, 2, 1, −5,...
Introduction to Threaded Binary Tree
What is Threaded Binary Tree?? A binary tree is threaded by making all right child pointers that would normally be null point to the inorder successor of the node (if it exists), and all left child pointers...
Swap Nodes in pairs in a Linked List by changing links
Objective: Given a linked list write an algorithm to swap nodes in pairs by changing links . Earlier we have seen “Swap Every Kth node in a Linked List“, where we have seen how...