双指针进行遍历
import java.util.*;
/*
public class ListNode {
int val;
ListNode next = null;
ListNode(int val) {
this.val = val;
}
}*/
public class Solution {
public ListNode FindFirstCommonNode(ListNode pHead1, ListNode pHead2) {
ListNode l1=pHead1;
ListNode l2=pHead2;
while(l1!=l2){
l1=l1==null?pHead1:l1.next;
l2=l2==null?pHead2:l2.next;
}
return l1;
}
}

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