力扣hot100 相交链表 思维题

Problem: 160. 相交链表

思路

👨?🏫 参考题解

👩?🏫 参考图解

复杂度

时间复杂度: $O(n+m)$

空间复杂度:

添加空间复杂度, 示例： $O(1)$

💖 Ac Code

/**
 * 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 you = headA;
		ListNode she = headB;
		while (you != she)
		{
//			设相交段为 C 则当走到相交段时 you ==she,不相交则走到 null
			you = you == null ? headB : you.next;// A + B + C
			she = she == null ? headA : she.next;// B + A + C
		}
		return you;
	}
}