Leetcode 545 Boundary of Binary Tree - Google, Amazon Interview Question Java Solution

Leetcode 545 Boundary of Binary Tree
Lintcode 878 · Boundary of Binary Tree

Google, Amazon Interview Question - Java Solution

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Link To The Problem:

Problem Description:
Given a binary tree, return the values of its boundary in anti-clockwise direction starting from root. Boundary includes left boundary, leaves, and right boundary in order without duplicate nodes.

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