add: 230313

cpp/2303/230313.cpp

@@ -0,0 +1,29 @@
+struct TreeNode {
+	int val;
+	TreeNode* left;
+	TreeNode* right;
+
+	explicit TreeNode(int x = 0, TreeNode* left = nullptr, TreeNode* right = nullptr) : val(x), left(left), right(right) {}
+};
+
+/**
+ * 101. Symmetric Tree
+ *
+ * Given the root of a binary tree, check whether it is a mirror of itself (i.e., symmetric around its center).
+ */
+
+class Solution {
+private:
+	static bool helper(TreeNode* L, TreeNode* R) {
+		if (!L && !R)
+			return true;
+		if (!L || !R)
+			return false;
+		return (L->val == R->val) && helper(L->right, R->left) && helper(L->left, R->right);
+	}
+
+public:
+	static bool isSymmetric(TreeNode* r) {
+		return !r || helper(r->left, r->right);
+	}
+};

cpp/2303/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2303)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2303 230313-CN.cpp)
+ADD_EXECUTABLE(2303 230313.cpp)