Fade to Solo
Dashboard
Patterns
Review
Mock
Python
← patterns
07
Trees
when this fires
recurse on subtrees — return-up vs pass-down; BFS for levels
Study
Guided
Wrestle
Solo
Easy
Medium
Hard
Unsolved only
✓
Invert Binary Tree
E
STUDY
✓
Maximum Depth
E
STUDY
✓
Diameter of Binary Tree
E
10 MIN
✓
Balanced Binary Tree
E
10 MIN
✓
Level Order Traversal
M
30 MIN
✓
Lowest Common Ancestor of a BST
M
30 MIN
✓
Validate BST
M
NO NET
✓
Kth Smallest in a BST
M
NO NET