https://leetcode.com/problems/binary-tree-preorder-traversal/ Binary Tree Preorder Traversal - LeetCode Level up your coding skills and quickly land a job. This is the best place to expand your knowledge and get prepared for your next interview. leetcode.com 이진 트리가 주어졌을 때, 전위 순회(preorder)로 값들을 vector에 모아 반환해주면 되는 문제다. /** * Definition for a binary tree node. * struct TreeNode { * int val; * Tree..
