msb-public-java
/
LeetCode
mirror of https://github.com/yuanguangxin/LeetCode
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Code Issues Projects Releases Wiki Activity

add q226

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pull/6/head
yuanguangxin 5 years ago
parent e7dd9f3eb6
commit 1fbb4281b3
4 changed files with 55 additions and 11 deletions
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31
.idea/workspace.xml
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@ -1,8 +1,9 @@
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@ -67,11 +68,11 @@
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1
README.md
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@ -67,6 +67,7 @@
* [q21_合并两个有序链表](/src/递归/q21_合并两个有序链表)
* [q101_对称二叉树](/src/递归/q101_对称二叉树)
* [q226_翻转二叉树](/src/递归/q226_翻转二叉树)
* [q236_二叉树的最近公共祖先](/src/递归/q236_二叉树的最近公共祖先)
### 分治法/二分法

23
src/递归/q226_翻转二叉树/Solution.java
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@ -0,0 +1,23 @@
package 递归.q226_翻转二叉树;
/**
* 递归 o(n)
*/
public class Solution {
public TreeNode invertTree(TreeNode root) {
if (root == null) {
return null;
}
TreeNode temp = root.left;
root.left = root.right;
root.right = temp;
if (root.left != null) {
invertTree(root.left);
}
if (root.right != null) {
invertTree(root.right);
}
return root;
}
}

11
src/递归/q226_翻转二叉树/TreeNode.java
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@ -0,0 +1,11 @@
package 递归.q226_翻转二叉树;
public class TreeNode {
int val;
TreeNode left;
TreeNode right;
TreeNode(int x) {
val = x;
}
}
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