INTERMEDIATE · 3 PRACTICE PROBLEMS
Trees
Explore branches. Discover recursive thinking.
THE CORE IDEA
Depth-first search
Follow one branch at a time. Recursion makes the repeated work feel natural.
O(n)A good place to practice
Start simple, then build up to the next challenge.
| Solved | Problem | Difficulty | Topic | Acceptance | Bookmark |
|---|---|---|---|---|---|
| Invert Binary Tree | Easy | Trees | 80.1% | ||
| Maximum Depth of Binary Tree | Easy | Trees | 76.4% | ||
| Binary Tree Level Order Traversal | Medium | Trees | 70.8% |