# Tag Archives: union-find

Given two arrays, and with n elements each. The task is to make these two arrays identical i:e, for each , we want to make . In a single… Read More
Below are the steps for finding MST using Kruskal’s algorithm   1. Sort all the edges in non-decreasing order of their weight. 2. Pick the smallest edge.… Read More
Given a tree, and the cost of a subtree is defined as |S|*AND(S) where |S| is the size of the subtree and AND(S) is bitwise… Read More
Given a tree and weights of nodes. Weights are non-negative integers. Task is to find maximum size of a subtree of a given tree such… Read More
Check whether a given graph contains a cycle or not.Example:   Input: Output: Graph contains Cycle. Input: Output: Graph does not contain Cycle. Prerequisites: Disjoint Set… Read More
Given a connected acyclic graph, a source vertex and a destination vertex, your task is to count the number of vertices between the given source… Read More
Dynamic connectivity is a data structure that dynamically maintains the information about thee connected components of graph. In simple words suppose there is a graph… Read More
I recently got interviewed for MakeMyTrip for the Software Engineer full time position. There were in a total of 5 rounds. First Round (Online Coding… Read More
Given a boolean 2D matrix, find the number of islands.A group of connected 1s forms an island. For example, the below matrix contains 5 islands … Read More
Given a set of n jobs where each job i has a deadline di >=1 and profit pi>=0. Only one job can be scheduled at… Read More
Consider a situation with a number of persons and following tasks to be performed on them. Add a new friendship relation, i.e., a person x… Read More
Prerequisite : LCA basics, Disjoint Set Union by Rank and Path CompressionWe are given a tree(can be extended to a DAG) and we have many… Read More
Given an undirected, connected and weighted graph, find Minimum Spanning Tree (MST) of the graph using Kruskal’s algorithm. Input : Graph as an array of… Read More
Given an undirected graph, how to check if there is a cycle in the graph? Example,  Input: n = 4, e = 4 Output: Yes Explanation: 0 1, 1… Read More
In the previous post, we introduced union find algorithm and used it to detect cycle in a graph. We used following union() and find() operations… Read More