复杂链表的赋值

# coding:utf-8
class RandomListNode:
    def __init__(self, x):
        self.label = x
        self.next = None
        self.random = None


class Solution:
    # 返回 RandomListNode
    def Clone(self, pHead):
        if not pHead:
            return None
        probe = pHead
        l1 = []
        d1 = {}
        # 将next关系保存到l1
        while probe:
            l1.append(probe)
            probe = probe.next
        probe = pHead
        # 将random关系按照键值对存到d1
        while probe:
            if probe.random:
                d1[probe] = probe.random
            else:
                d1[probe] = -1
            probe = probe.next
        # 按照l1里面的节点的值，创建新的节点，并按照l1的顺序存放到new_probe
        new_probe = [RandomListNode(x.label) for x in l1]
        # 给新的节点创建next指针
        for i in range(len(new_probe)-1):
            new_probe[i].next = new_probe[i+1]
        # 给新的节点创建random指针
        for i in range(len(new_probe)):
            if d1[l1[i]] != -1:
                new_probe[i].random = new_probe[l1.index(d1[l1[i]])]
        return new_probe[0] if new_probe[0] else None

# 创建链表进行验证
a = RandomListNode(‘a‘)
b = RandomListNode(‘b‘)
c = RandomListNode(‘c‘)
d = RandomListNode(‘d‘)
e = RandomListNode(‘e‘)

a.next = b
b.next = c
c.next = d
d.next = e

a.random = c
b.random = d
c.random = a
e.random = d

s = Solution()
ret = s.Clone(a)

r1 = ret
r2 = ret

while r1:
    if r1.random:
        print r1.random.label
    else:
        print None
    r1 = r1.next

while r2:
    print r2.label
    r2 = r2.next