题解 | #两个链表的第一个公共结点#

struct ListNode* FindFirstCommonNode(struct ListNode* pHead1, struct ListNode* pHead2 ) {
    struct ListNode* t1,*t2;
    if(!pHead1 || !pHead2)
    {
        return NULL;
    }
    // write code here
    t1 = pHead1;
    t2 = pHead2;
    while (t1) {
        t2 = pHead2;
        while(t2)
        {
            if(t1==t2)
            {
                return t2;
            }
            t2=t2->next;
        }
        t1=t1->next;
    }
    return NULL;
}