Merge pull request gzc426#10 from Saul-Zhang/Saul-Zhang-patch-7

Saul-Zhang · web-flow · commit 53d5a8117e7d · 2018-12-08T14:14:22.000+08:00
Create Saul.md
diff --git a/2018.12.04-leetcode101/Saul.md b/2018.12.04-leetcode101/Saul.md
@@ -0,0 +1,24 @@
+```java
+/**
+ * Definition for a binary tree node.
+ * public class TreeNode {
+ *     int val;
+ *     TreeNode left;
+ *     TreeNode right;
+ *     TreeNode(int x) { val = x; }
+ * }
+ */
+class Solution {
+   public boolean isSymmetric(TreeNode root) {
+    return isMirror(root, root);
+}
+
+public boolean isMirror(TreeNode t1, TreeNode t2) {
+    if (t1 == null && t2 == null) return true;
+    if (t1 == null || t2 == null) return false;
+    return (t1.val == t2.val)
+        && isMirror(t1.right, t2.left)
+        && isMirror(t1.left, t2.right);
+}
+}
+```
