解题思路:
java
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) {
* val = x;
* next = null;
* }
* }
*/
public class Solution {
public ListNode getIntersectionNode(ListNode headA, ListNode headB) {
if (headA == null || headB == null) return null;
ListNode pa = headA;
ListNode pb = headB;
while (pa != pb) {
pa = (pa != null) ? pa.next : headB;
pb = (pb != null) ? pb.next : headA;
if (pa == null && pb == null) return null;
}
return pa;
}
}