You are given two integers n and m. Calculate the number of pairs of arrays (a,b) such that:

You can perform any of the following operations with this number an arbitrary (possibly, zero) number of times:

Emuskald is a well-known illusionist. One of his trademark tricks involves a set of magical boxes. The essence of the trick is in packing the boxes inside other...

After Asgard was destroyed, tanker brought his soldiers to earth, and at the same time took on the important task of protecting the peace of the earth. The best...

The hot summer came so quickly that Xiaoming and Xiaohong decided to buy a big and sweet watermelon. But they are two very strange people. They are even-numbere...

https://vjudge.net/problem/2135388/origin Describe

Cow Laundry Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 1376 Accepted: 886 Description

因为偶尔关注QQ运动， 看到QQ运动的积分抽奖界面比较有意思，所以就尝试用自定义View实现了下，原本想通过开发者选项查看下界面的一些信息，后来发现积分抽奖界面是在WebView中展示的，应该是在H5页面中用js代码实现的，暂时不去...

Recall that MEX of an array is a minimum non-negative integer that does not belong to the array. Examples:

You are given an array a consisting of n integers (it is guaranteed that n is even, i.e. divisible by 2). All ai does not exceed some integer k.