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102-BinaryTreeLevelOrderTraversal.cs
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//-----------------------------------------------------------------------------
// Runtime: 240ms
// Memory Usage: 30.6 MB
// Link: https://leetcode.com/submissions/detail/378987791/
//-----------------------------------------------------------------------------
using System.Collections.Generic;
namespace LeetCode
{
public class _102_BinaryTreeLevelOrderTraversal
{
private Queue<TreeNode> queue = new Queue<TreeNode>();
public IList<IList<int>> LevelOrder(TreeNode root)
{
var results = new List<IList<int>>();
if (root == null) return results;
queue.Enqueue(root);
while(queue.Count > 0)
{
var result = new List<int>();
var levelSize = queue.Count;
for (int i = 0; i < levelSize; i++)
{
var node = queue.Dequeue();
result.Add(node.val);
if (node.left != null)
queue.Enqueue(node.left);
if (node.right != null)
queue.Enqueue(node.right);
}
results.Add(result);
}
return results;
}
}
}