Level order traversal
Easy Accuracy: 49.61% Submissions: 57022 Points: 2

Given a binary tree, find its level order traversal.
Level order traversal of a tree is breadth-first traversal for the tree.

Example 1:

  /   \ 
 3     2
Output:1 3 2

Example 2:

     /      \
    20       30
  /   \
 40   60
Output:10 20 30 40 60 N N

Your Task:
You don't have to take any input. Complete the function levelOrder() that takes the root node as input parameter and returns a list of integers containing the level order traversal of the given Binary Tree.

Expected Time Complexity: O(N)
Expected Auxiliary Space: O(N)

1 <= Number of nodes<= 104
1 <= Data of a node <= 104

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