class Solution {
public:
    ListNode* FindFirstCommonNode( ListNode* pHead1, ListNode* pHead2) {
        ListNode* cut1 = pHead1;
        ListNode* cut2 = pHead2;
		while(cut1 != cut2)
		{

			cut1 = cut1==nullptr ? pHead2 : cut1->next;
			cut2 = cut2==nullptr ? pHead1 : cut2->next;

		}
		return cut1;

    }
};