Reverse the Directed Graph
Objective: Given a directed graph, write an algorithm to reverse the graph. Example: Approach: Create a new graph with the same number of vertices. Traverse the given graph. Here we are using the adjacency...
Category: Beginner
Find Third Smallest elements in a given array
Objective: Given an array of integers, write an algorithm to find the third smallest element in the array. Example: Int [] a = { 6, 8, 1, 9, 2, 10}; Output: Third smallest element...
Find the maximum number present in a String
Given a string with alphabets and numbers. Write an algorithm to find the maximum number in the string. If any number is greater than equal to Max_Value of integer then return the Max_Value. Example:...
Count number of subgraphs in a given graph
Objective: Given a Graph, write a program to count all the subgraphs. Example: Approach: Use Depth-First Search Start the DFS from any random vertex. Once DFS is completed check if all the vertices are...
Convert Roman Number to Integer
Objective: Given a Roman number, write a program to convert it to Integer. Roman Number – Letters used in Roman numerals and the corresponding numerical values are given in the table below. Rules: ...
Convert Integer to Roman
Objective: Given an Integer, write a program to convert it to Roman number. This problem can be stated as “Convert Decimal to Roman String” OR “Convert numeral value to Roman numeral”. Roman Number –...
Linear Search vs Binary Search
Earlier we have seen linear search and binary search and how these work individually, In this article we will compare these two search algorithms. If you are new to these, please read the prerequisites...
Count the number of nodes in a given binary tree
Objective: Given a binary tree, write an algorithm to count all the nodes in the tree. Example: Approach: Do postorder traversal. If the root is null return 0. (base case all well for the...
Longest contiguous character in a given String – O(N) Solution
Objective: Given an input string, write an algorithm to find the longest contiguous character or in other words, find a maximum consecutive character in the string. Example: Input: “aaabbccccddbbaaa” Output: c, count = 4...
Collatz Conjecture – Steps to transform Number to 1
The Collatz conjecture is a conjecture in mathematics which states that no matter what value of Positive Number N, If the below sequence is followed then, the sequence will always reach 1. If N...
String to Integer (AtoI – ASCII to Integer)
Objective: Implement atoi, which converts string to an integer. Rules for converting string to an integer. If the string is null or empty, Integer will be 0. The first character of string may represent...
Find all Prime Numbers less than equal to N | Set 1
Objective: Given a number N, Write a program to find all prime numbers which are between 0 and N. Prime Number : A prime number is a natural number that has exactly two distinct...
Find third largest element in a given array
Objective: Given an array of integers, write an algorithm to find the third largest element in the array. Example: Int [] a = { 6, 8, 1, 9, 2, 1, 10} Output: Third largest...
Find duplicates Characters in the given String
Objective: Given a string, write an algorithm to find all the duplicate characters in the string and print its count. Example: Input String: tutorial horizon Output: Duplicate Characters: r – 2 t – 2...
Java program to find the largest element in array
Objective– Given an array of numbers, write a java program to find the largest element in the given array. Example: int [] a = {1, 5, 3, 9, 2, 8, 2} Largest Element: 9...