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class ListNode:
    def __init__(self, x):
        self.val = x
        self.next = None

def ListNode2List(self,l1: ListNode):
    out = []
    while l1:
        out.append(l1.val)
        l1 = l1.next
    return out

class ListNode:
    def __init__(self, x):
        self.val = x
        self.next = None

def list2link(list_):
    head = ListNode(list_[0])
    p = head
    for i in range(1, len(list_)):
        p.next = ListNode(list_[i])
        p = p.next
    return head