Binary Tree Right Side View

Med
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Solution Guide: Binary Tree Right Side View

Approach

Perform BFS per level and keep the last visited node value from each level.

Complexity Analysis

Time
O(n) where n is node count
Space
O(w) where w is max width

Pattern

Level-Order + Projection

Why It Works

At each level, the last node processed by left-to-right traversal is the rightmost visible node.

Updated Feb 2026