摘要：
描述： Given a linked list, swap every two adjacent nodes and return its head. For example,Given 1->2->3->4, you should return the list as 2->1->4->3. Yo 阅读全文
摘要：
题目描述： You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes 阅读全文