working solution

problem1.py

@@ -0,0 +1,26 @@
+# problem 1 
+
+# Definition for a binary tree node.
+# class TreeNode:
+#     def __init__(self, val=0, left=None, right=None):
+#         self.val = val
+#         self.left = left
+#         self.right = right
+class Solution:
+
+    def helper(self,root,targetSum,curr_sum,curr_arr):
+        if not root:
+            return
+        curr_sum += root.val
+        curr_arr.append(root.val)
+        if root.left is None and root.right is None:
+            if curr_sum == targetSum:
+                self.sum_arr.append(list(curr_arr))
+        self.helper(root.left,targetSum,curr_sum,curr_arr)
+        self.helper(root.right,targetSum,curr_sum,curr_arr)
+        curr_arr.pop()
+
+    def pathSum(self, root: Optional[TreeNode], targetSum: int) -> List[List[int]]:
+        self.sum_arr = []
+        self.helper(root,targetSum,0,[])
+        return self.sum_arr

problem2.py

@@ -0,0 +1,24 @@
+# problem 2 
+# Definition for a binary tree node.
+# class TreeNode:
+#     def __init__(self, val=0, left=None, right=None):
+#         self.val = val
+#         self.left = left
+#         self.right = right
+class Solution:
+
+    def check(self,left_node,right_node):
+        if left_node and not right_node:
+            return False 
+        if not left_node and right_node:
+            return False
+        if not left_node and not right_node:
+            return True
+        if left_node.val != right_node.val:
+            return False
+        return self.check(left_node.right,right_node.left) and self.check(left_node.left,right_node.right)
+
+    def isSymmetric(self, root: Optional[TreeNode]) -> bool:
+        if not root:
+            return True 
+        return self.check(root.left,root.right)