Building Roads - CSES Graph Problem | Easy DFS Approach | Number of Provinces | visualize
Автор: Aditya Singh
Загружено: 2025-06-17
Просмотров: 88
Описание:
Struggling with the "Building Roads" problem on CSES?
This video breaks it down in a super simple and beginner-friendly way using classic DFS traversal—no MST or DSU required! Learn how to count connected components and build the roads needed to connect all cities efficiently.
What You’ll Learn:
How to model the cities and roads as a graph
Use DFS or BFS to find connected components
Build logic to connect all components with the minimum number of roads
Full code walkthrough with dry run and explanation
Time & space complexity breakdown
🧠 Problem Focus: Graph Traversal (DFS), Connected Components
🧑💻 Coding Language: Java
🔗 CSES Problem Link: https://cses.fi/problemset/task/1666
🧩 Similar Problems on Other Platforms:
LeetCode – Number of Provinces (aka Disjoint Set or DFS/BFS for components)
LeetCode – Graph Valid Tree
GeeksforGeeks – Find the number of islands
Codeforces – Roads Not Only in Berland
AtCoder – Count Connected Components
#BuildingRoads #CSES #GraphTraversal #DFS #BFS #ConnectedComponents #GraphTheory #LeetCode #NumberOfProvinces #Codeforces #CompetitiveProgramming #DSA
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