# dfs problems geeksforgeeks

DFS is more suitable when there are solutions away from source. Description of testcases is as follows: The First line of each test case contains two integers 'N' and 'E'  which denotes the no of vertices and no of edges respectively. Example: Here time complexity would be 0(n) where 'n' is the length of the array. In this tutorial, you will learn about the depth-first search with examples in Java, C, Python, and C++. 4 is connected to 2 It then visits node 20, node 50, node 70 respectively as they are directly connected. You don’t need to read input or print anything. Explanation: Solution: Approach: Depth-first search is an algorithm for traversing or searching tree or graph data structures. Prerequisites: See this post for all applications of Depth First Traversal. Given a connected undirected graph. A Computer Science portal for geeks. Expected Time Complexity: O(V + E) The only catch here is, unlike trees, graphs may contain cycles, so we may come to the same node again. 1 is connected to 0. Note: Use recursive approach. 1 #1 Two Sum. BFS considers all neighbors first and therefore not suitable for decision making trees used in games or puzzles. 2 is connected to 0 and 4 Depth first search (DFS) is an algorithm for traversing or searching tree or graph data structures. 2 <= N <= 104 Following are implementations of simple Depth First Traversal. Solve company interview questions and improve your coding intellect ... Geeksforgeeks close. Level up your coding skills and quickly land a job. Input: Platform to practice programming problems. Given a connected undirected graph. Thanks for all the positive feedback. Perform a Depth First Traversal of the graph. Water Connection Problem Medium Accuracy: 19.53% Submissions: 3013 Points: 4 Every house in the colony has at most one pipe going into it and at most one pipe going out of it. Perform a Depth First Traversal of the graph. Here are some important DFS problems asked in Technical Interviews: Find number of islands; Transitive closure of a graph using DFS; Application of DFS; Detect cycle in an undirected graph A group of connected 1s forms an island. By creating this account, you agree to our. 3 is connected to 0. Please choose 'ReadOnlyMode' if you needn't to 'Edit' the problem e.g. Then 'T' test cases follow. Solve company interview questions and improve your coding intellect Expected Auxiliary Space: O(V). Leetcode Pattern 1 | DFS + BFS == 25% of the problems — part 2. Do you still want to view the editorial?