原题
输入两个链表，找出它们的第一个公共结点。
Reference Answer
思路分析
将链表中节点放入list后进行操作，对这种确定公共节点，计算数目之类的问题无往不利。
# -*- coding:utf-8 -*-
# class ListNode:
# def __init__(self, x):
# self.val = x
# self.next = None
class Solution:
def FindFirstCommonNode(self, pHead1, pHead2):
# write code here
if not pHead1 or not pHead2:
return None
temp = []
start1 = pHead1
start2 = pHead2
while start1:
temp.append(start1)
start1 = start1.next
while start2:
if start2 in temp:
return start2
start2 = start2.next
return None