Node distances hackerrank For each of T test cases, print a single line consisting of N-1 space separated integers, denoting the shortest distances of the remaining N-1 places from Rust's position (that is all distances, except the source node to itself) using the village roads/side lanes in ascending order based on vertex number. Input: Output: 4 5 2 7 3 Neighbour nodes within distance 2 of node 4 are: 4 5 2 7 3 Approach: To print all the nodes that are at distance K or less than K. Simply put, the height of a tree is the number of edges between the root node and its furthest leaf. John lives in HackerLand, a country with N cities and M bidirectional roads. If a node is unreachable, its distance is -1. Can you solve this real interview question? Minimize Malware Spread - You are given a network of n nodes represented as an n x n adjacency matrix graph, where the ith node is directly connected to the jth node if graph[i][j] == 1. Follow the steps below to solve the problem: Initialize minSum to INT_MAX. A node a is an ancestor of b if either: any child of a is equal to b or any child of a is an ancestor of b. If a node is disconnected, it's distance should be -1 Link: Problem Description. Learn to use Dijkstra's shortest path algorithm !GoPromotional products Dijkstra: Shortest Reach 2 is an innovative approach to solving the shortest path problem in graph theory, often used in computer science and network optimization. Each of the nodes is labeled consecutively from 1 to n. While the queue is non In this HackerRank in Data Structures - Get Node Value solutions Given a pointer to the head of a linked list and a specific position, determine the data value at that position. Learn to use Dijkstra's shortest path algorithm ! Anyone who' doing it in java and using djisktra algo, it is possible. Problem Solving on hacker rank. Starting at a given node, all neighbors are examined. For example, consider the following graph of 5 nodes: Solutions to HackerRank problems. Aug 6, 2021 · Given an n-ary tree rooted at vertex 1. Note that is a metric space. Moreover, each warehouse has a value assigned to it denoted by the array val Aug 6, 2013 · Given A Tree. The depth (or level) of some node is its distance (i. Contribute to VikashPR/CCC-Hackerrank development by creating an account on GitHub. Examples: Input: Output: 2 Explanation: As shown below, LCA of 4 and 5 is 2. pdf at main · alif2499/HackerRank-Solutions HackerRank solutions in Java/JS/Python/C++/C#. Given a tree and a node of tree, print all nodes which are at distance k from the given node. or each node, you need to print the sum of the distance of the nodes to all other nodes. Node is the root of the tree. Given a graph, determine the distances from the start node to each of its descendants and return the list in node number order, ascending. Oct 18, 2025 · HackerRank is a well - known online platform that offers coding challenges, competitions, and technical assessments across a wide range of programming languages, including Node. Dec 7, 2022 · Return an array of distances from the start node in node number order. Find the sum of all values associated with the nodes on the unique path from to . For example It is required to calculate the shortest distance from start position (Node S) to all of the other nodes in the graph. Example Join over 28 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Jul 12, 2025 · Initialize a 2-d array, dp [N] [2*N] with initial value as 'inf' except dp [S] [0] as 0. Each of the roads has a distinct length, and each length is a power of two (l. Finding the sum of distances from all nodes: Doing the above for each node would be too slow if n is large. Pre-process the graph to find the shortest distance of each and every node from the source for every edge length between {0 to N-1}. By implementing this algorithm, users can efficiently calculate the shortest path between two points in a graph, providing essential insights for routing Solutions to HackerRank problems. We can do it by applying dfs variation, that takes K node from where we have to print the distance until distance Hackerrank Challenge. 7 Notes: All easy Algorithm challenges && Problem Solving (Basic) challenges solved. val - b. Example HackerRank concepts & solutions. If a node is unreachable, return for that node. Edit: I didn't post the full problem since it's not public on Hackerrank so I don't want to publicly post it. Example After you create a representation of the graph, you must determine and report the shortest distance to each of the other nodes from a given starting position using the breadth-first search algorithm (BFS). May 15, 2023 · In this post, we will solve HackerRank Dijkstra: Shortest Reach 2 Problem Solution. Store the Graph in Hashmap , edges as well. Given an undirected graph and a starting node, determine the lengths of the shortest paths from the starting node to all other nodes in the graph. Find the minimum distance Jeanie must travel to deliver all her letters. note:if all the nodes of the tree got removed before or at kth iteration, then print 0. Jun 15, 2023 · Introduction In computer science, one of the fundamental problems is finding the shortest path between two nodes in a graph. , number of edges) from the tree's root node. Node D is unreachable, hence -1 is printed (not Infinity). e. Oct 4, 2025 · Given the root of a Binary Tree with unique values and two node values n1 and n2, find the Lowest Common Ancestor (LCA). Contribute to yznpku/HackerRank development by creating an account on GitHub. The distance from a node to itself is always and it is always reachable from itself. This combination of HackerRank and Node. Each node has a value associated with it and tree is input in the form of adjacency Jul 12, 2025 · Given a graph of N nodes, E edges, a node X and a distance K. Find the shortest path length between any two nodes with the given condition. Find maximum flow in this graph. Input: Output: 3 Explanation: As shown below, LCA of 7 and 8 is 3. Solving code challenges on HackerRank is one of the best ways to prepare for programming interviews. The queue is primed with the staring node. Nodes will be numbered consecutively from 1 to n, and edges will have varying distances or lengths. A normal queue works in simple order and processes nodes based on arrival time, not based on their distance. Breadth First Search: Shortest Reach Breadth-first search (BFS) is a standard algorithm for finding a node in a graph. Each of the subsequent lines contains three space-separated integers describing the respective values of (the number of nodes in the graph), (the number of edges in the graph), and (the value of the MST graph). HackerRank-city is an acyclic connected graph (or tree). Contribute to jguerra7/HackerRank-1 development by creating an account on GitHub. Jul 15, 2025 · BFS is generally used to find the Shortest Paths in the graph and the minimum distance of all nodes from Source, intermediate nodes, and Destination can be calculated by the BFS from these nodes. we need to calculate the sum of distances between each pair of nodes. , is the number of edges on the path between vertices and ). Approach of the solution: Create a graph representation using a defaultdict of lists to store the adjacency list for each node. Given queries in the form of a graph and some starting node, , perform each query by calculating the shortest distance from starting node to all the other nodes in the graph. Given an undirected graph and a starting node, determine the lengths of the shortest paths from the starting node to all other nodes in the graph. You have to save You are given a weighted tree with nodes. Compatible Warehouses HackerLand has a network of warehouses which can be represented as an undirected rooted weighted tree consisting of warehouse_nodes number of nodes, rooted at warehouse 1. The task is to print all the nodes within the distance K from X. If some node is an ancestor of some node , then the path from to is the sequence of nodes starting with , moving down the ancestral chain of children, and ending with . Contribute to kailash12manit/hackerrank-solutions development by creating an account on GitHub. it has initially 1 node and at each step, we need to create 3 duplicates of the current tree and 2 new nodes to connect all 4 copies in the H shape. js, a JavaScript runtime built on Chrome's V8 JavaScript engine, allows developers to run JavaScript code outside of a web browser. js. We then print node 's distance to nodes , , and (respectively) as a single line of space-separated integers: 6, 6, -1. Find and print the distance between the two furthest points in this metric space! Contribute to Pragna235/Smart_Interviews_Primary_HackerRank development by creating an account on GitHub. So, we need a faster way. The exact problem statement can be found here, but to summarize, it is finding the distances of the shortest path from a starting node to every other node i Sri-Akshat5 / HackerRank-typing-distance Public Notifications You must be signed in to change notification settings Fork 0 Star 0 Jul 31, 2024 · In this HackerRank City problem solution, we have an acyclic connected graph or tree and the construction of the whole tree takes place in N steps. Then find difference of maximum distant leaf node and minimum distant leaf node from root node (1) of the resultant tree. You can find me on hackerrank here. Jun 27, 2020 · We define node to be the starting position for a BFS. Your task is to construct an undirected tree of nodes such that it has score exactly equal to . * * Tricky point: * Edge just represents node 1 has connection with node 2, not the sequence. Note: The letters can be delivered in any order. Passed 8/8 Test Cases Solution used Adjacency List and Queue For every node i in the range [0, n - 1], your task is to independently calculate the minimum number of edge reversals required so it is possible to reach any other node starting from node i through a sequence of directed edges. . Then all neighbors of neighbors are visited if they have not yet been visited, and so on. Remove all leaf nodes in the current tree upon each iterations, upto k iterations. Nodes are numbered from to . Dec 12, 2019 · Practice -> Algorithms -> Implementation. Jul 12, 2025 · Given a graph of N nodes, E edges, a node X and a distance K. Mathematically, for each node , print the value of the expression . “HackerRank — #61 Minimum Distances [Easy]” is published by Jayram Manale. He can build any number of bidirectional roads as long as the resultant network satisfies these constraints: It must be possible to reach any city from any other city by traveling along the network of roads. If there is no such tree possible print out a single edge containing " " For example, for the following tree May 14, 2023 · The shortest distances from 8 to the other nodes are one edge to node 2, one edge to node 3, and an infinite distance to node 4 (which it is not connected to). No two roads can directly connect the same two cities. Each of the subsequent lines contains two space-separated integers, and , that describe an undirected edge between nodes and . Consider an undirected graph consisting of nodes where each node is labeled from to and the edge between any two nodes is always of length . Nodes will be numbered consecutively from to , and edges will have varying distances or lengths. May 27, 2023 · By initializing the distances to all nodes as -1, except the starting node with a distance of 0, and using a queue to keep track of nodes to visit, we can gradually update the distances as we explore the graph. com's BotClean AI Challenge - hackerrank_botclean_implementation Kotlin solution similar to Dijkstra's algorithm with different distance calculation (weights are not cumulative like in the traditional problem) Solutions to HackerRank problems. Lukas is a Civil Engineer who loves designing road networks to connect cities numbered from to . Then print a single line of n-1 space-separated integers listing node 's shortest distance to each of the n - 1 other nodes (ordered sequentially by node number); if s is disconnected from a node, print -1 as the distance to that node. The first line contains an integer, , denoting the number of graphs. 2 raised to some exponent). We define node to be the starting position for a BFS. The shortest path problem is applicable in various real-world scenarios such as navigation systems, network routing, traffic optimization, and social network analysis. Contribute to srgnk/HackerRank development by creating an account on GitHub. You have been provided with two integers and . Learn to use Dijkstra's shortest path algorithm !Given an undirected graph and a starting node, determine the lengths of the shortest paths from the starting node to all other nodes in the graph. However, there are some C# & Python solutions. Solutions for some of the interesting coding challenges - yfcheng/hackerrank Take each node as the root of the tree, run DFS, and save for each node i, the number of nodes in the subtree rooted at i whose distance to the root is divisible by signalSpeed. Then print a single line Oct 1, 2020 · The shortest distances from to the other nodes are one edge to node , one edge to node , and an infinite distance to node (which it's not connected to). It is one of the biggest public repository for Algorithms & Data Structures. If a node is unreachable, print for that node. If a node is unreachable, return -1 for that node. Sample Input 0 2 4 3 1 2 2 3 1 4 1 4 Let the function be the distance between two vertices in tree (i. The score of a tree is defined to be the sum of distance of each node from the root node. Function Description Complete the bfs function in the editor below. Let's construct a complete graph: capacity of edge (u, v) is distance between u and v in tree. HackerRank concepts & solutions. In this tutorial, we will discuss the shortest Maximum Difference Between Node and Ancestor - Given the root of a binary tree, find the maximum value v for which there exist different nodes a and b where v = |a. Each node has a value associated with it and tree is input in the form of adjacency Jul 23, 2025 · The sum of these depths gives us the sum of distances from the root node to all other nodes. You are given a tree, , with vertices, as well as points in . There are multiple edges. Nov 15, 2025 · Dijkstra uses a priority queue because we always want to process the node with the shortest distance first. The first line contains two space-separated integers, N (the number of cities) and K (the number of letters), respectively. Given an array of unique elements, construct a Binary Search Tree and find the number of nodes at a distance K from the given source node S. The process is described below: It initially has node. Return the maximum distances in a vector mxdist. Dec 6, 2023 · I am doing HackerRank problem BFS Shortest reach: Consider an undirected graph where each edge weighs 6 units. Jun 20, 2024 · This repository is mostly Java & PHP solutions of HackerRank Algorithms & Data Structures' Questions. If we used a normal queue, a node with a larger distance might be processed before a smaller one, which breaks Dijkstra’s logic. This result is achieved by applying the Floyd-Warshall algorithm, which systematically considers all possible intermediate nodes to update the shortest path estimates. Automated the process of adding solutions using Hackerrank Solution Crawler. 317 efficient solutions to HackerRank problems. Node. We then return an array of distances from node 1 to nodes 2, 3, and May 20, 2023 · In this post, we will solve HackerRank Roads in HackerLand Problem Solution. Assume that node with number 1 is the root node of tree. Whenever two nodes are directly connected, and at least one of those two nodes is infected by malware, both Print the total number of challenges created by hackers. Contribute to BlakeBrown/HackerRank-Solutions development by creating an account on GitHub. If there are edges between the same pair of nodes with different weights, the last one (most recent) is to be considered as the only edge between them. Traverse the graph from the source node S using BFS. I know solution of O(n^2) complexity . LCA is the deepest node that has both n1 and n2 as descendants. Feb 26, 2022 · You are given a table, BST, containing two columns: N and P, where N represents the value of a node in Binary Tree, and P is the parent of N. Return an array of distances from the start node in node number order. Hackerrank Solutions of more than 380 problems of Hackerrank across several domains. Note: Both node values are always present in the Binary Tree. so the connected node's distance is my (node) distance + EDGE_DISTANCE. Solution: This clearly is an application of floyd algorithm for minimum distances. S denotes the node 1 in the test case and B,C and D denote 2,3 and 4. Its not an ordinary place, the construction of the whole tree takes place in steps. For example, if current node (A) has distance of 6, and an edge connecting it with another node (B) is 2, the distance to B through A will be 6+2=8. Jun 4, 2017 · Given q queries in the form of a graph and some starting node, s , perform each query by calculating the shortest distance from starting node s to all the other nodes in the graph. Write a query to find the node type of Binary Tree orde More formally, all the nodes at a distance from node in the subtree of node will have the Fibonacci number added to them. Distances are to be reported in node number order, ascending. js provides a great environment for HackerRank concepts & solutions. Some nodes initial are initially infected by malware. Oct 20, 2016 · For each of the test cases, print a single line consisting space separated integers denoting the shortest distance of nodes other than from starting position in increasing order of their labels. My HackerRank solutions . Aug 18, 2016 · I am practicing my coding at HackerRank. In this HackerRank in Data Structures - Get Node Value solutions Given a pointer to the head of a linked list and a specific position, determine the data value at that position. The key is to use the answer for one node to quickly find the answer for its neighbors. The first line contains two space-separated integers, the respective values of (the number of nodes in tree ) and (the number of nodes in the query set). Maximum Score Solution for HackerRank. Jul 31, 2024 · In this HackerRank City problem solution, we have an acyclic connected graph or tree and the construction of the whole tree takes place in N steps. If you are looking for anyone of these things - hackerrank solutions java GitHub | hackerrank tutorial in java | hackerrank 30 days of code solutions | hackerrank algorithms solutions | hackerrank cracking the coding interview solutions | hackerrank general programming You're given a weighted tree. Contribute to RyanFehr/HackerRank development by creating an account on GitHub. At each step, you must create duplicates of the current tree, and create new nodes to connect all copies in the following H shape: At each step, the tree becomes times bigger plus new nodes, as well Solutions to HackerRank problems. Given a map of HackerLand, can you help John determine the sum of Jun 20, 2024 · This repository is mostly Java & PHP solutions of HackerRank Algorithms & Data Structures' Questions. A road cannot directly connect a S denotes the node 1 in the test case and B,C and D denote 2,3 and 4. val| and a is an ancestor of b. Contribute to shreyansh-tyagi/HackerRank-problems development by creating an account on GitHub. Since S is the starting node and the shortest distances from it are (1 edge, 1 edge, Infinity) to the nodes B,C and D (2,3 and 4) respectively. Here are some solution to the hackerrank coding problems - HackerRank-Solutions/Counting Sort_hackerrank. Apr 10, 2024 · For each node, find the maximum distance by taking the maximum of the distance calculated from dt_st and distance calculated from dt_end. } /* * The function design: * Need to know if the edge is shortest distance by connected directly, * otherwise, get the route of shortest distance, and also mark the edge/ remove the edge * for future consideration - any two node shortest distance calculation * * The idea is to using BFS - breadth first search * -- need to avoid loops HackerRank Solutions in Python3. Data CCC CTech DSBS Hackerrank codes . Solutions to HackerRank problems. The array dp [] [] will be used to store the results of the pre-processing. You are given a weighted tree with nodes. Typically, this is implemented with a queue of nodes to visit. We can do it by applying dfs variation, that takes K node from where we have to print the distance until distance Given the destination cities for K letters and the definition of each road in Byteland, find and print the minimum distance Jeanie must travel to deliver all K letters. After you create a representation of the graph, you must determine and report the shortest distance to each of the other nodes from a given starting position using the breadth-first search algorithm (BFS). It’s possible for John to reach any city from any other city. A binary tree X is flip equivalent This repository contains efficient hackerrank solutions for most of the hackerrank challenges including video tutorials. You will be given a number of * Edges means two nodes have connection. Graph constraint problem (how many ways to find 3 nodes with same distance between each other) It was not for an online assessment just for one of their certificates but found them very hard. Nov 23, 2022 · HackerRank Roads and Libraries Solution Solve HackerRank Roads and Libraries Problem Problem Determine the minimum cost to provide library access to all citizens of HackerLand. Jul 31, 2024 · After you create a representation of the graph, you must determine and report the shortest distance to each of the other nodes from a given starting position using the breadth-first search algorithm (BFS). Calculate the square of the minimum time required to start the bike race. Mark the source node as visited with distance 0, update its neighbours to have distance equal to their edge weight // 3. How to find distance between every pair of nodes in tree without using 2D matrix of size n*n. Store distances in hashmap Use priority queue Make a Node class for priority queue Store the results in hashmap In the main code, where reading of file is going on, start coding right from there so you don't have to iterate the loop again. Mar 27, 2025 · Top 25 Hackerrank Coding Questions is given in this page along with the Solutions in different languages so tha you ca practice more. Profile: Hakan_SONMEZ 205/563 challenges solved Rank: 4781 Points: 5077. 📗 Solutions of more than 380 problems of Hackerrank accross several domains. * So FROM could be edge[0] or edge[1]. I'll dm people who are interested. Jun 2, 2025 · The output matrix shows the shortest distances between all pairs of nodes. Create a set of unvisited vertices, all with initial distance INF // 2. The subsequent lines define each set over two lines in the following format: The first line contains an integer Contest [Nodes at Distance K] in Virtual Judge. Calculate the distance from U to each of its unvisited neighbours (call it D) // 5. Day 73 of #100DaysOfCode Problem : For a binary tree T, we can define a flip operation as follows: choose any node, and swap the left and right child subtrees. Join over 28 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Find the unvisited vertex with the minimum distance (call it U) // 4. Contribute to RodneyShag/HackerRank_solutions development by creating an account on GitHub. Each element dist [i] [j] in the result represents the minimal cost to travel from node i to node j. Example May 21, 2023 · For each of T test cases, print a single line consisting of N-1 space separated integers, denoting the shortest distances of the remaining N-1 places from Rust’s position (that is all distances, except the source node to itself) using the village roads/side lanes in ascending order based on vertex number. There are (warehouse_nodes - 1) roads connecting they and warehouse_weight [i] denotes the distance covered by the ith road. May 28, 2025 · Learn Dijkstra's Algorithm: A quick guide to understanding how it finds the shortest paths for GPS, network routing, and optimization problems. The tree has n vertices and n-1 edges. For current node, consider all its unvisited neighbors and calculate their tentative distance (from the initial node).