摘要：
题目描述 Given a nested list of integers, implement an iterator to flatten it. Each element is either an integer, or a list -- whose elements may also be 阅读全文
摘要：
题目描述 The thief has found himself a new place for his thievery again. There is only one entrance to this area, called the "root." Besides the root, eac 阅读全文