LeetCode 144: Binary Tree Preorder Traversal
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Q:
Given a binary tree, return the preorder traversal of its nodes’ values.
前序遍历： 根左右
/** * Definition for a binary tree node. * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode(int x) { val = x; } * } */public class Solution { List<Integer> pre = new ArrayList<Integer>(); public List<Integer> preorderTraversal(TreeNode root) { //为空树则返回 if (root==null) return pre; //前序遍历 TreeNode current = root; //不为空则加入列表 if(current!=null){ pre.add(current.val); preorderTraversal(current.left); preorderTraversal(current.right); } return pre; }} 0 0
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