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Level order traversal
Level order traversal is like level by level . In a binary tree first node is called level 0 . 2nd layer is called level 1 . 3rd layer level 2 . It is counted from left to write .
Level order traversal is like level by level . In a binary tree first node is called level 0 . 2nd layer is called level 1 . 3rd layer level 2 . It is counted from left to write .
