Binary Tree Level Order Traversal
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/** * Definition for binary tree * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode(int x) { val = x; } * } */public class Solution { public List<List<Integer>> levelOrder(TreeNode root) {//做完后弄清queue和priority queue的区别 List<List<Integer>> a=new LinkedList<List<Integer>>();//答案中用linkedlist(奇怪哈,用ArrayList和List都出错) Queue<TreeNode> b=new LinkedList<TreeNode>();//答案中用linkedlist//Queue<Integer> b=new LinkedList<Integer>()这个写法错误 if(root==null) return a;//if(root==null) return null;写法错误 b.offer(root); while(!b.isEmpty())//while要小写 { int rowsize=b.size();//用.size()来获取当前行内元素的长度 List<Integer> c=new LinkedList<Integer>();//用它来存放Queue中的当前行内容 for(int i=1;i<=rowsize;i++) { if(b.peek().left!=null)b.offer(b.peek().left);//queue中的添加用offer//b.peek().left.val!=null这个写法错 if(b.peek().right!=null)b.offer(b.peek().right);//用.peek()获取queue的首位元素 c.add(b.poll().val);//c.add(b.peek())写法错误 } a.add(c);//将当前行的所有元素放入a } return a; }}
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- Binary Tree Level Order Traversal
- Binary Tree Level Order Traversal
- Binary Tree Level Order Traversal
- Binary Tree Level Order Traversal
- Binary Tree Level Order Traversal
- Binary Tree Level Order Traversal
- Binary Tree Level Order Traversal
- Binary Tree Level Order Traversal
- Binary Tree Level Order Traversal
- Binary Tree Level Order Traversal
- Binary Tree Level Order Traversal
- Binary Tree Level Order Traversal
- Binary Tree Level Order Traversal
- Binary Tree Level Order Traversal
- Binary Tree Level Order Traversal
- Binary Tree Level Order Traversal
- Binary Tree Level Order Traversal
- Binary Tree Level Order Traversal
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