Merge pull request #2069 from crazytan/patch-1

Update 二叉树理论基础.md

problems/二叉树理论基础.md

@@ -195,15 +195,16 @@ Java：
 ```java
 public class TreeNode {
     int val;
-  	TreeNode left;
+    TreeNode left;
-  	TreeNode right;
+    TreeNode right;
-  	TreeNode() {}
+
-  	TreeNode(int val) { this.val = val; }
+    TreeNode() {}
-  	TreeNode(int val, TreeNode left, TreeNode right) {
+    TreeNode(int val) { this.val = val; }
-    		this.val = val;
+    TreeNode(int val, TreeNode left, TreeNode right) {
-    		this.left = left;
+        this.val = val;
-    		this.right = right;
+        this.left = left;
-  	}
+        this.right = right;
+    }
 }
 ```
 
@@ -212,10 +213,10 @@ Python：
 
 ```python
 class TreeNode:
-    def __init__(self, value):
+    def __init__(self, val, left = None, right = None):
-        self.value = value
+        self.val = val
-        self.left = None
+        self.left = left
-        self.right = None
+        self.right = right
 ```
 
 Go：