You are given an array a consisting of n positive integers.

Memphis loves xor very musch.Now he gets an array A.The length of A is n.Now he wants to know the sum of all (lowbit(Ai xor Aj)) (i,j∈[1,n]) We define that low...

Lee just became Master in Codeforces, and so, he went out to buy some gifts for his friends. He bought n integers, now it’s time to distribute them between his ...

Problem Description In many applications very large integers numbers are required. Some of these applications are using keys for secure transmission of data, e...

n robots have escaped from your laboratory! You have to find them as soon as possible, because these robots are experimental, and their behavior is not tested y...

Today, Osama gave Fadi an integer X, and Fadi was wondering about the minimum possible value of max(a,b) such that LCM(a,b) equals X. Both a and b should be pos...

这些设置控制内建流复制特性（见Section 26.2.5）的行为。服务器将可以是主控服务器或后备服务器。主控机能发送数据，而后备机总是被复制数据的接收者。当使用级联复制（见Section 26.2.7）时，后备服务器也可以是发送者，同时也是...

排序算是比较高频的面试题了，节前面试了的两家公司都有问到排序问题，整理后分享给大家（文末见总结）。

如果在程序应用中（比如：游戏的音效等）需要播放密集、短促的音效，这时就使用SoundPool来播放音效，SoundPool使用音效池的概念来管理多个短促的音效，例如它可以开始就10个音效，以后在程序中按音效的ID进行播放。...

n people came to a party. Then those, who had no friends among people at the party, left. Then those, who had exactly 1 friend among those who stayed, left as w...