Time: 38 ms (22.20%), Space: 54.4 MB (47.91%) - LeetHub

Author: harshubhatnagar

606-construct-string-from-binary-tree/606-construct-string-from-binary-tree.java

@@ -0,0 +1,32 @@
+/**
+ * Definition for a binary tree node.
+ * public class TreeNode {
+ *     int val;
+ *     TreeNode left;
+ *     TreeNode right;
+ *     TreeNode() {}
+ *     TreeNode(int val) { this.val = val; }
+ *     TreeNode(int val, TreeNode left, TreeNode right) {
+ *         this.val = val;
+ *         this.left = left;
+ *         this.right = right;
+ *     }
+ * }
+ */
+class Solution {
+    public String tree2str(TreeNode root) {
+        if(root == null)
+            return "";
+        
+        if(root.left == null && root.right == null)
+            return String.valueOf(root.val);
+        
+        String l = tree2str(root.left);
+        String r = tree2str(root.right);
+        
+        if(r == "")
+            return String.valueOf(root.val) + "("+l+")";
+        else
+            return String.valueOf(root.val) + "("+ l + ")" + "("+ r +")";
+    }
+}