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trees/has_path_sum.py

@@ -0,0 +1,25 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# author: bt3gl
+
+def has_path_sum(root: Optional[TreeNode], target_sum: int) -> bool:
+    
+        def transverse(node, sum_here=0):
+            
+            if not node:
+                return sum_here == target_sum
+            
+            sum_here += node.val
+            
+            if not node.left:
+                return transverse(node.right, sum_here)
+            if not node.right:
+                return transverse(node.left, sum_here)
+            else:   
+                return transverse(node.left, sum_here) or transverse(node.right, sum_here)
+    
+        if not root:
+            return False
+        
+        return transverse(root)
+