Problem In Validate Binary Search Tree problem we have given the root of a tree, we have to check if it is a binary search tree or not. Example : Output: true Explanation: The given tree is a binary search tree because all elements which are left to each subtree …
First, we need to know about what is Traversal in Binary Tree. Traversal is a type of method in which we visit all the nodes exactly once in some specific manner/order. Basically there are two types of traversal in Binary Tree: Breadth-First Traversal Depth First Traversal We already know about …
Least Recently Used (LRU) Cache is a type of method which is used to maintain the data such that the time required to use the data is the minimum possible. LRU algorithm used when the cache is full. We remove the least recently used data from the cache memory of …
What is merge sort? Merge Sort is a Recursive Procedure. It is also a divide and conquers algorithm. Now we need to know what divide and conquer algorithm is? It’s a type of procedure in which we divide the problem into subproblems and divide them until we find the shortest …
In Find unique character in a string problem, we have given a string containing only lower case alphabets(a-z). We need to find the first non-repeating character in it and print the index. if no such character exists print -1. Input Format Only a single line containing string. Output Format Print …
Integer to Roman conversion. We have given a number N and we need to print the Roman number of N. Roman numbers are represented by the use of {I, V, X, L, C, D, M} values. Let’s see some examples for good understanding. Input Format Only a single line containing …
Valid Sudoku is a problem in which we have given a 9*9 Sudoku board. We need to find the given Sudoku is valid or not on the basis of the following rules: Each row must contain the digits 1-9 without repetition. Each column must contain the digits 1-9 without repetition. Every of the 9 3×3 sub-boxes …
Rabin Karp Algorithm used to find the pattern string in the given text string. There are so many types of algorithms or methods used to find the pattern string. In this algorithm, we use Hashing for finding the pattern matching. If we got the same hash code for the substring …
Sort colors is a problem in which we have to given an array containing N objects. Each box is painted with a single color which can be red, blue, and white. We have N objects which are already painted. We have to sort the array such that the same color …