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对Java版本前序排列的修改

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chenhaoran14
2022-01-20 12:04:49 +08:00
parent b124befd12
commit 43eb0269d3
1 changed files with 7 additions and 7 deletions
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14
problems/二叉树的递归遍历.md
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@ -116,19 +116,19 @@ Java：
```Java ```Java
// 前序遍历·递归·LC144_二叉树的前序遍历 // 前序遍历·递归·LC144_二叉树的前序遍历
class Solution { class Solution {
ArrayList<Integer> preOrderReverse(TreeNode root) { public List<Integer> preorderTraversal(TreeNode root) {
ArrayList<Integer> result = new ArrayList<Integer>(); List<Integer> result = new ArrayList<Integer>();
preOrder(root, result); preorder(root, result);
return result; return result;
} }
void preOrder(TreeNode root, ArrayList<Integer> result) { public void preorder(TreeNode root, List<Integer> result) {
if (root == null) { if (root == null) {
return; return;
} }
result.add(root.val); // 注意这一句 result.add(root.val);
preOrder(root.left, result); preorder(root.left, result);
preOrder(root.right, result); preorder(root.right, result);
} }
} }
// 中序遍历·递归·LC94_二叉树的中序遍历 // 中序遍历·递归·LC94_二叉树的中序遍历