# Middle-题目37：199. Binary Tree Right Side View

Given a binary tree, imagine yourself standing on the right side of it, return the values of the nodes you can see ordered from top to bottom.

For example:
Given the following binary tree,

   1            <---
/   \
2     3         <---
\     \
5     4       <---

You should return [1, 3, 4].

/**
* Definition for a binary tree node.
* public class TreeNode {
*     int val;
*     TreeNode left;
*     TreeNode right;
*     TreeNode(int x) { val = x; }
* }
*/
public class Solution {
public List<Integer> rightSideView(TreeNode root) {

List<Integer> list=new ArrayList<Integer>();
if(root == null)
return list;

while(!queue.isEmpty()) {
TreeNode current = queue.remove();
int curLevel=levelqueue.remove();

if(current.left!=null) {
}
if(current.right!=null) {
}
if(levelqueue.isEmpty() == true || levelqueue.peek() == curLevel + 1)
}
return list;
}
}

3ms,beats 10.90%,众数3ms,40.54%

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