题解 | 两个链表的第一个公共结点

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

#
# 
# @param pHead1 ListNode类 
# @param pHead2 ListNode类 
# @return ListNode类
#
class Solution:
    def FindFirstCommonNode(self , pHead1 , pHead2 ):
        # write code here
        if not pHead1 or not pHead2:
            return None
        p1, p2 = pHead1, pHead2
        while p1 != p2:
            p1 = p1.next if p1 else pHead2
            p2 = p2.next if p2 else pHead1
        return p1