摘要：
由于这个问题，涉及了很多知识，例如数据结构里面的哈希表，c++中的迭代器，因此，需要对于每一个疑惑逐一击破。 问题描述 You have a lock in front of you with 4 circular wheels. Each wheel has 10 slots: '0', '1', 阅读全文
摘要：
问题描述 Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and is formed by connecting ad 阅读全文