Leetcode------Binary Tree Right Side View

Source: Internet
Author: User

Title: Binary Tree Right Side View
Pass Rate: 27.9%
Difficulty: Medium

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

For example:
Given The following binary tree,

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

You should return [1, 3, 4] .

The subject is a hierarchical traversal of an extension, according to the layer through each time each layer of the last element into the list of results can be, the code is as follows:

1 /**2 * Definition for binary tree3 * public class TreeNode {4 * int val;5 * TreeNode left;6 * TreeNode right;7 * TreeNode (int x) {val = x;}8  * }9  */Ten  Public classSolution { One      PublicArraylist<integer>Rightsideview (TreeNode root) { AArraylist<integer> res=NewArraylist<integer>(); -Linkedlist<treenode> queue=NewLinkedlist<treenode>(); -         intCount=1,tmp=0; the         if(root==NULL)returnRes; - queue.addlast (root); -          while(!Queue.isempty ()) { -Tmp=0; +              for(inti=1;i<=count;i++){ -TreeNode tmptree=Queue.removefirst (); +                 if(i==count) Res.add (tmptree.val); A                 if(tmptree.left!=NULL){ at Queue.addlast (tmptree.left); -tmp++; -                 } -                 if(tmptree.right!=NULL){ - Queue.addlast (tmptree.right); -tmp++; in                 } -                  to             } +Count=tmp; -         } the         returnRes; *     } $}

Leetcode------Binary Tree Right Side View

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