摘要： Given an integer (signed 32 bits), write a function to check whether it is a power of 4. Example: Given num = 16, return true. Given num = 5, return f 阅读全文

摘要： I was anxious not to be late for class on my first day. 在我第一天上学的时候我非常焦虑我会上课迟到。 One of my new acquaintances, who considerately reminded me that her nam 阅读全文