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DFS

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Uber's Online Test Experience

Last Updated: 23 July 2025

Online test problems excite some people and make others very nervous. A fascinating challenge popped up in the Uber online test: Participants had to find the shortest path...read more

Interview Experiences

Depth First Search or DFS on Directed Graph

Last Updated: 23 May 2026

Depth-First Search (DFS) is a basic algorithm used to explore graph structures. In directed graphs, DFS can start from a specific point and explore all the connected nodes...read more

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Count Number of Nodes Equal to Sum of Descendants

Last Updated: 23 July 2025

Given the root of a binary tree. The task is to return the number of nodes where the value of the node is equal to the sum of the values of its descendants. A descendant o...read more

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Find Maximum Subtree of the Same Color

Last Updated: 30 April 2024

Given a 2D integer array edges[] representing a tree with n nodes, numbered from 0 to n - 1, rooted at node 0, where edges[i] = [ui, vi] means there is an edge between the...read more

Time and Space Complexity of DFS and BFS Algorithm

Last Updated: 23 July 2025

The time complexity of both Depth-First Search (DFS) and Breadth-First Search (BFS) algorithms is O(V + E), where V is the number of vertices and E is the number of edges ...read more

Analysis of Algorithms

Data Structures and Algorithms-QnA

Maximum Number of Accepted Invitations to Party

Last Updated: 23 July 2025

Given a grid of m boys and n girls, where grid[i][j] = 1 represents that ith boy can invite girl jth girl to party. Each boy can invite only one girl and each girl can acc...read more

CSES Solutions - Grid Paths

Last Updated: 23 July 2025

There are 88418 paths in a 7x7 grid from the upper-left square to the lower-left square. Each path corresponds to a 48-character description consisting of characters D (do...read more

Count of nodes at a distance K for every node

Last Updated: 23 July 2025

Given a tree of N vertices and a positive integer K. The task is to find the count of nodes at a distance K for every node.Examples:Input: N = 5, K = 2, edges[][] = {{1, 2...read more

Time and Space Complexity of Depth First Search (DFS)

Last Updated: 23 July 2025

The Depth First Search (DFS) algorithm is used to traverse a graph. It starts with a given source node and explores as far as possible along each branch before backtrackin...read more

Subtree with exactly K primes

Last Updated: 23 July 2025

Given a tree with N nodes and (N - 1) edges, where the nodes are assigned values from 1 to N, and the root node is 1. The task is to determine if there exists a subtree wi...read more

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Expected number of coins after K moves

Last Updated: 23 July 2025

Given an undirected graph of V nodes and E edges and an array coins[] of size V, such that coins[i] = number of coins present at ith node. Initially, choose any node unifo...read more

Dynamic Programming

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Data Structures

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Find Edge Weights in a Spanning Tree with Edge (u, v)

Last Updated: 23 July 2025

Given an undirected weighted graph with N nodes and M edges, the task is for each edge (u, v) find the minimum possible weight of the Spanning Tree which contains the edge...read more

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Kruskal'sAlgorithm

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Find the path from root to a vertex such that all K vertices belongs to this path or 1 distance away

Last Updated: 23 July 2025

Given a tree consisting of N vertices numbered from 1 to N rooted at vertex 1. You are given Q queries. Each query consists of the set of K distinct vertices vi[1], vi[2],...read more

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Optimal Tree Connectivity

Last Updated: 15 January 2024

Given an undirected tree consisting of n vertices and n-1 edges. The task is to add the minimum number of edges in such a way that the length of the shortest path from ver...read more

Algorithms-Dynamic Programming

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Min Length String with All Substrings of Size N

Last Updated: 28 April 2025

Given two integers n and k, your task is to find a string of minimum length to contain all possible strings of size n as a substring. The characters of the string should b...read more

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