199. Binary Tree Right Side View
199. Binary Tree Right Side View 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. 1 2 3 4 Example 1: Input: root = [1,2,3,null,5,null,4] Output: [1,3,4] 1 2 3 4 Example 2: Input: root = [1,null,3] Output: [1,3] 1 2 3 4 Example 3: Input: root = [] Output: [] Constraints:...