摘要:
Problem:Given a linked list, remove thenthnode from the end of list and return its head.For example, Given linked list: 1->2->3->4->5, and n = 2. ... 阅读全文
摘要:
Problem:Given a digit string, return all possible letter combinations that the number could represent.A mapping of digit to letters (just like on the ... 阅读全文