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class ListNode: def __init__(self, val=0, next=None): self.val = val self.next = next
cur = head while cur.next: if cur.next.val == 2: cur.next = cur.next.next break cur = cur.next
cur = head.next pre = head while cur: if cur.val == 2: pre.next = cur.next break pre = cur cur = cur.next
dummy = ListNode(0, head) cur = dummy while cur.next: if cur.next.val == 2: cur.next = cur.next.next break cur = cur.next
cur = head while cur: if cur.val == 2: cur = cur.next break cur = cur.next