u014655590的专栏

【题目】 Merge two sorted linked lists and return it as a new list. The new list should be made by    splicing together the nodes of the first two lists.【答案】1.解法一：最麻烦的有两点：1）l1、l2理解成数据没有意义的头结点还

【题目】  Given two binary trees, write a function to check if they are equal or not.  Two binary trees are considered equal if they are structurally identical and the nodes have the same value.