Lowest Common Ancestor Problems
13 Lowest Common Ancestor problems on LeetCode, a Trees interview pattern, ranked by importance (how often it comes up in real interviews). Difficulty (ELO) and importance shown per problem.
| # | PROBLEM | DIFF | ELO | IMP | PATTERNS |
|---|---|---|---|---|---|
| 1 | Lowest Common Ancestor of a Binary Tree | Easy | 1387 | 87 | DFS Traversal (Inorder, Preorder, Postorder) |
| 2 | Lowest Common Ancestor of a Binary Search Tree | Easy | 1222 | 85 | BST Operations (Insert, Delete, Validate) |
| 3 | Lowest Common Ancestor of a Binary Tree IVPREMIUM | Medium | 1427 | 72 | DFS Traversal (Inorder, Preorder, Postorder) · Frequency Counting / Hash Map Lookup |
| 4 | Find Distance in a Binary TreePREMIUM | Medium | 1487 | 72 | DFS Traversal (Inorder, Preorder, Postorder) |
| 5 | Lowest Common Ancestor of a Binary Tree IIPREMIUM | Medium | 1580 | 72 | DFS Traversal (Inorder, Preorder, Postorder) |
MORE TREES PATTERNS
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