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Makefile	Makefile
README.md	README.md
__init__.py	__init__.py
solver.py	solver.py
test_solver.py	test_solver.py

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Level Order Traversal of Binary Tree

This problem was asked by Microsoft.

Description

Given the root of a binary tree, return an array with its level-order traversal.

Input:
    1
   / \
  2   3
     / \
    4   5

Output: [1, 2, 3, 4, 5]