Depth-First Search pattern
Graph Valid Tree
Given n nodes and a list of undirected edges, determine whether the edges form a valid tree, meaning the graph is fully connected and contains no cycles. Watch it run step by step, then write your own pseudocode and get it checked by AI.
- LeetCode 261
- Medium
- 1 approach
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Depth-First SearchLeetCode 261
Medium
The approach
- 01 Edge-count gate + DFS cycle/connectivity check O(V + E)O(V) space
What you will learn
- How to read Graph Valid Tree and spot the depth-first search pattern in it
- Edge-count gate + DFS cycle/connectivity check: O(V + E) time, O(V) space
- The pseudocode for each approach, its line lit as the animation runs
- Practice: write your own pseudocode and get it checked
More Depth-First Search
See Graph Valid Tree run, step by step
Sign in and this page opens on the animation, with all 18 Depth-First Search problems beside it.
DSA comes with the all labs plan and every ChaiCode batch.