为了预防老年痴呆顺便维持手感，一个程序员应当时不时刷几道算法题挑战一下。记得之前上算法课的时候，我一直认为动归的题都是最简单的——套路嘛，遇事不...

今天创建新项目的时候发现bindView不管用了，运行报空指针错误，所有的控件都在假装自己没有被bind，非常可恶。 网上一查，发现是一个非常常...

The Hamming distance between two integers is the number of positions at ...

Given a positive integer n and you can do operations as follow: If n is ...

There are N children standing in a line. Each child is assigned a rating...

The count-and-say sequence is the sequence of integers with the first fi...

Given two binary trees and imagine that when you put one of them to cove...