/* struct ListNode { int val; struct ListNode *next; ListNode(int x) : val(x), next(NULL) { } };*/ class Solution { public: ListNode* FindFirstCommonNode( ListNode* pHead1, ListNode* pHead2) { if(pHead1 == nullptr || pHead2 == nullptr){ return nullptr; } ListNode *cur1=pHead1; ListNode *cur2=pHead2;...