<ul><li>To solve the boundary traversal of a binary tree, we need to list the left boundary nodes, right boundary nodes, and leaf nodes.</li><li>For the given binary tree, the boundary traversal is as follows: a, b, d, h, a, c, g, l, h, i, j, f, k, l.</li><li>To get the left boundary nodes, we traverse the left side of the tree from the root until we reach a leaf node.</li><li>Similarly, to get the right boundary nodes, we traverse the right side of the tree from the root until we reach a leaf node, but in a bottom-up manner.</li></ul>

Boundary Traversal of Binary Tree

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