/* struct ListNode { int val; struct ListNode *next; ListNode(int x) : val(x), next(NULL) { } };*/ class Solution { public: ListNode* FindFirstCommonNode( ListNode* pHead1, ListNode* pHead2) { ListNode *p1 = pHead1,*p2 = pHead2; while(p1!=p2){ p1 = (p1!=nullptr)?p1->next:p...