std::function是一个函数包装器模板，它可以存储、复制和调用任何可调用对象。它是一个类型擦除容器，提供了统一的接口来处理各种可调用实体。

小Hi最近在追求一名学数学的女生小Z。小Z其实是想拒绝他的，但是找不到好的说辞，于是提出了这样的要求：对于给定的两个正整数N和M，小Hi随机选取一个N的约数N'...

Time Limit: 1000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Ot...

Time Limit: 1 Sec Memory Limit: 128 MB Submit: 95 Solved: 12 Sub...

基准时间限制：1 秒 空间限制：131072 KB 分值: 0 难度：基础题

Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 131070/65535 K (Java/O...

Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32767 K (Java/Ot...

For each case, firstly you have to print the case number as the form "Case d:", ...

Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65768/65768 K (Java/Ot...

基准时间限制：1 秒 空间限制：131072 KB 分值: 10 难度：2级算法题

Fox Ciel is going to publish a paper on FOCS (Foxes Operated Computer Systems, ...

A k-multiple free set is a set of integers where there is no pair of integers w...

While Patrick was gone shopping, Spongebob decided to play a little trick on hi...

You have just moved from Waterloo to a big city. The people here speak an inc...

Every year there is the same problem at Halloween: Each neighbour is only willin...

The input contains N natural (i.e. positive integer) numbers ( N <= 10000 ). ...

A sequence of N positive integers (10 < N < 100 000), each of them less than ...

The binary weight of a positive integer is the number of 1's in its binary rep...

时间限制： 3000 ms | 内存限制： 65535 KB