Created
July 13, 2014 21:59
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public ArrayList<ArrayList<TreeNode>> TreeToList(TreeNode root) { | |
ArrayList<ArrayList<TreeNode>> lst = new ArrayList<ArrayList<TreeNode>>(); | |
if (root == null) | |
return lst; | |
Queue<TreeNode> queue = new LinkedList<TreeNode>(); | |
queue.add(root); | |
queue.add(null); | |
ArrayList<TreeNode> level = new ArrayList<TreeNode>(); | |
while (!queue.isEmpty()) { | |
TreeNode node = queue.poll(); | |
if (node != null) { | |
level.add(node); | |
if (node.left != null) | |
queue.add(node.left); | |
if (node.right != null) | |
queue.add(node.right); | |
} else { | |
lst.add(level); | |
level = new ArrayList<TreeNode>(); | |
if (!queue.isEmpty()) | |
queue.add(null); | |
} | |
} | |
return lst; | |
} |
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