Merge pull request gzc426#295 from wswdwf/patch-12

gzc426 · web-flow · commit 175acfcd3ff0 · 2018-12-04T17:26:11.000+08:00
Create Sagittarius.md
diff --git a/2018.12.4-leetcode101/Sagittarius.md b/2018.12.4-leetcode101/Sagittarius.md
@@ -0,0 +1,35 @@
+```
+/**
+ * Definition for a binary tree node.
+ * struct TreeNode {
+ *     int val;
+ *     TreeNode *left;
+ *     TreeNode *right;
+ *     TreeNode(int x) : val(x), left(NULL), right(NULL) {}
+ * };
+ */
+bool isSymmetric1(TreeNode* r1,TreeNode* r2)
+{
+    if(!r1&&!r2)
+            return true;
+    else if((r1&&!r2)||(!r1&&r2))
+            return false;
+    else
+    {
+        if(r1->val!=r2->val)
+            return false;
+        else 
+            return isSymmetric1(r1->left,r2->right)&&isSymmetric1(r1->right,r2->left);
+    }
+    
+}
+class Solution {
+public:
+    bool isSymmetric(TreeNode* root) {
+        if(!root)
+            return true;
+        else
+            return isSymmetric1(root->left,root->right);
+    }
+};
+```
