def removeZeroSumSublists(self, head: ListNode) -> ListNode:
dummy = ListNode(0)
dummy.sum = 0
dummy.next = head
cur_sum = 0
p = head
while p:
cur_sum += p.val
p.sum = cur_sum
p = p.next
start = dummy
while start:
cur = start.next # node0
while cur:
range_sum = cur.sum - start.sum
if range_sum == 0:
start.next = cur.next # delete start->next 到 cur
break
else:
cur = cur.next
start = start.next
return dummy.next
