__author__ = 'Hk4Fun'
__date__ = '2018/4/12 15:03'
'''题目描述：
Write a program to find the node at which the intersection of two singly linked lists begins.
For example, the following two linked lists:

A:          a1 → a2
                   ↘
                     c1 → c2 → c3
                   ↗            
B:     b1 → b2 → b3
begin to intersect at node c1.

Notes:
If the two linked lists have no intersection at all, return null.
The linked lists must retain their original structure after the function returns.
You may assume there are no cycles anywhere in the entire linked structure.
Your code should preferably run in O(n) time and use only O(1) memory.
'''
'''主要思路：
target_offer/37_两个链表的第一个公共结点.py （思路5）   
'''


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


class Solution(object):
    """
    :type head1, head1: ListNode
    :rtype: ListNode
    """

    def getIntersectionNode(self, headA, headB):
        p1, p2 = headA, headB
        while p1 is not p2:
            p1 = p1.next if p1 else headB
            p2 = p2.next if p2 else headA
        return p1


# ================================测试代码================================
from Test import Test


class MyTest(Test):
    def my_test_code(self):
        self.debug = False  # debug为True时每个测试用例只测试一遍，默认情况下关闭debug模式
        self.TEST_NUM = 1  # 单个测试用例的测试次数, 只有在debug为False的情况下生效
        testArgs = []
        # 只需在此处填写自己的测试代码
        # testArgs中每一项是一次测试，每一项由两部分构成
        # 第一部分为被测试函数的参数，第二部分只有最后一个，为正确答案

        testArgs.append([])
        testArgs.append([])
        testArgs.append([])
        testArgs.append([])
        testArgs.append([])
        testArgs.append([])
        testArgs.append([])
        testArgs.append([])
        testArgs.append([])
        testArgs.append([])

        return testArgs

    def convert(self, result, *func_arg):
        # 在此处填写转换函数，将测试结果转换成其他形式
        return result

    def checked(self, result, expected, *func_arg):
        # 在此处填写比较器，测试返回的结果是否正确
        return result == expected


if __name__ == '__main__':
    solution = Solution()
    MyTest(solution=solution).start_test()
