find-all-the-lonely-nodes

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1469. Find All The Lonely Nodes (Easy)

Related Topics

[Tree] [Depth-First Search] [Breadth-First Search] [Binary Tree]

Similar Questions

1. Binary Tree Tilt (Easy)
2. Univalued Binary Tree (Easy)

Hints

Hint 1

Do a simple tree traversal, try to check if the current node is lonely or not.

Hint 2

Node is lonely if at least one of the left/right pointers is null.