摘要：
Mergeksorted linked lists and return it as one sorted list. Analyze and describe its complexity.思路：合并k个有序链表为一个有序链表。我们可以用先合并两个链表的方法，然后逐个遍历链表数组，与上一个合并结束... 阅读全文
摘要：
Given a stringSand a stringT, count the number of distinct subsequences ofTinS.A subsequence of a string is a new string which is formed from the orig... 阅读全文