From 4c473d407c39bb6cfae9e07e6bcb36a47b014b70 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Wed, 26 Aug 2020 23:26:41 +0800
Subject: import(solutions): Add problem 101 .

---
 works/solutions/cpp/101.cpp | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 works/solutions/cpp/101.cpp

(limited to 'works/solutions/cpp/101.cpp')

diff --git a/works/solutions/cpp/101.cpp b/works/solutions/cpp/101.cpp
new file mode 100644
index 0000000..a1dad6f
--- /dev/null
+++ b/works/solutions/cpp/101.cpp
@@ -0,0 +1,43 @@
+#include <cstddef>
+
+struct TreeNode
+{
+    int val;
+    TreeNode *left;
+    TreeNode *right;
+    TreeNode(int x) : val(x), left(NULL), right(NULL) {}
+};
+
+class Solution
+{
+public:
+    static bool check(TreeNode *left, TreeNode *right)
+    {
+        if (left == NULL)
+        {
+            if (right == NULL)
+                return true;
+            else
+                return false;
+        }
+        else
+        {
+            if (right == NULL)
+                return false;
+            else
+            {
+                if (left->val != right->val)
+                    return false;
+                return check(left->left, right->right) && check(left->right, right->left);
+            }
+        }
+    }
+
+    bool isSymmetric(TreeNode *root)
+    {
+        if (root == nullptr)
+            return true;
+
+        return check(root->left, root->right);
+    }
+};
-- 
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