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11 problems total
| Title | Difficulty | Videos | Companies |
|---|---|---|---|
| Validate Binary Search Tree | medium | ||
| Binary Tree Traversal - Zigzag Level Order Traversal | medium | - | |
| Maximum Depth of Binary Tree | easy | ||
| Word Ladder 1 - Get Ladder Length | hard | - | |
| Word Break 1 - Check if word is breakable | medium | ||
| Number of Islands | medium | ||
| Pacific Atlantic Water Flow | medium | ||
| Island Perimeter | easy | ||
| Open the Lock | medium | - | |
| Letter Case Permutation | medium | - | |
| Cousins in Binary Tree | easy | - |