https://leetcode.com/problems/merge-nodes-in-between-zeros

medium/merge_nodes_in_between_zeros.py

@@ -0,0 +1,20 @@
+#https://leetcode.com/problems/merge-nodes-in-between-zeros
+class ListNode:
+    def __init__(self, val=0, next=None):
+        self.val = val
+        self.next = next
+class Solution:
+    def mergeNodes(self, head: Optional[ListNode]) -> Optional[ListNode]:
+        left = ListNode(-1, None)
+        left.next = head
+        curr = head
+        val = 0
+        while curr is not None:
+            if curr.val == 0 and left.next != curr:
+                left.next.val = val
+                left = left.next
+                val = 0
+            val += curr.val
+            curr = curr.next
+        left.next = None
+        return head