摘要：
You are given a doubly linked list which in addition to the next and previous pointers, it could have a child pointer, which may or may not point to a 阅读全文
摘要：
A linked list is given such that each node contains an additional random pointer which could point to any node in the list or null. Return a deep copy 阅读全文
摘要：
You are given two non empty linked lists representing two non negative integers. The most significant digit comes first and each of their nodes contai 阅读全文