Print all substrings of a given string
Objective: Given a string write an algorithm to print all the possible sub strings. Example: String input = “abcd”; Output: Possible sub strings – a a b a b c a b c d b...
Tagged: Intermediate
Print all subarrays of a given array
Objective: Given an array write an algorithm to print all the possible sub arrays. Example: int [] a = {1, 2, 3}; Output: Possible subarrays – {1}, {2}, {3}, {1, 2} , {2, 3}, {1,...
Divide and Conquer – Rearrange array elements in special order
Objective: Given an array of integers of size 2n, write an algorithm to arrange them such that first n elements and last n elements are set up in alternative manner. Say n = 3 and...
Remove Duplicates from a string
Objective: Given a string, write an algorithm to remove the duplicate characters in that string. Example: Input: tutorialhorizon Output: tuorialhzn Approaches: There are multiple approaches to solve this problem- Use Sorting – (Will change the...
Find median of two sorted arrays of same size
Objective: Given two sorted arrays of size n. Write an algorithm to find the median of combined array (merger of both the given arrays, size = 2n). What is Median? The median is the value separating the...
Find local minimum or local maximum in O(1).
Objective: Given an array such that every next element differs from the previous by +/- 1. (i.e. a[i+1] = a[i] +/-1 ) Find the local max OR min in O(1) time. The interviewer mentioned one...
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...
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....