cpp-flashcards/org/study_deck_02/dsa/trees/0199-binary-tree-right-side-view.org

#+ANKI_DECK: study_deck_02
* TODO 0199. Binary Tree Right Side View :medium:
:PROPERTIES:
:NEETCODE: [[file:../../roadmap.org::*0199. Binary Tree Right Side View][0199. Binary Tree Right Side View]]
:END:

Given the ~root~ of 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/.

*Example 1:*

*Input:* root = [1,2,3,null,5,null,4]

*Output:* [1,3,4]

*Explanation:*

*Example 2:*

*Input:* root = [1,2,3,4,null,null,null,5]

*Output:* [1,3,4,5]

*Explanation:*

*Example 3:*

*Input:* root = [1,null,3]

*Output:* [1,3]

*Example 4:*

*Input:* root = []

*Output:* []

*Constraints:*

 - The number of nodes in the tree is in the range ~[0, 100]~.

 - ~-100 <= Node.val <= 100~

** TODO Approach
Write your approach here.

** TODO Python
#+begin_src python :lc-problem 199 :lc-lang python3
# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, val=0, left=None, right=None):
#         self.val = val
#         self.left = left
#         self.right = right
class Solution:
    def rightSideView(self, root: Optional[TreeNode]) -> List[int]:
#+end_src

** TODO C++
#+begin_src cpp :lc-problem 199
/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode() : val(0), left(nullptr), right(nullptr) {}
 *     TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
 *     TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}
 * };
 */
class Solution {
public:
    vector<int> rightSideView(TreeNode* root) {
        
    }
};
#+end_src