/* public class ListNode { int val; ListNode next = null; ListNode(int val) { this.val = val; } }*/ public class Solution { public ListNode FindFirstCommonNode(ListNode pHead1, ListNode pHead2) { if ( pHead1 == null || pHead2 == null) { return null; } ListNode p1 = pHead1; ListNode p2 = pHead2; whil...