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:
null./**
* Definition for singly-linked list.
* struct ListNode {
* int val;
* ListNode *next;
* ListNode(int x) : val(x), next(NULL) {}
* };
*/
class Solution {
public:
ListNode *getIntersectionNode(ListNode *headA, ListNode *headB) {
int lenA = 0;
int lenB = 0;
ListNode *head1 = headA;
<span style="white-space:pre"> </span>ListNode *head2 = headB;
while (head1!=NULL)
{
head1 = head1->next;
lenA++;
}
while (head2!=NULL)
{
head2 = head2->next;
lenB++;
}
int n;
if (lenA < lenB)
{
n = lenB - lenA;
head1 = headA;
head2 = headB;
for (int i = 0; i < n; i++)
{
head2 = head2->next;
}
}
else
{
n = lenA - lenB;
head1 = headA;
head2 = headB;
for (int i = 0; i < n; i++)
{
head1 = head1->next;
}
}
while (head1 != head2)
{
head1 = head1->next;
head2 = head2->next;
}
return head1;
}
};
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Leetcode45：Intersection of Two Linked Lists
原文：http://blog.csdn.net/u013089961/article/details/46806081