144

Author: Ashish-kumar7

144.cpp

@@ -0,0 +1,20 @@
+
+
+class Solution {
+public:
+    vector<int> preorderTraversal(TreeNode* root) {
+        vector<int>A;
+        traversingtree(root,A);
+        return A;
+    }
+    
+    void traversingtree(TreeNode * root,vector<int>&A){   
+        if(root==NULL){
+            return ;
+        }
+         A.push_back(root->val);
+        traversingtree(root->left,A);
+       
+        traversingtree(root->right,A);
+    }
+};