Our chemical biologists have invented a new very useful form of life called stripies (in fact, they were first called in Russian - polosatiki, but the scientist...

js部分(实现逻辑): 第一:先获取到表单的所有的input标签,用来实现动态的,这里注意一下,

After passing a test, Vasya got himself a box of n candies. He decided to eat an equal amount of candies each morning until there are no more candies. However, ...

Nastya received a gift on New Year — a magic wardrobe. It is magic because in the end of each month the number of dresses in it doubles (i.e. the number of dres...

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:

To become the king of Codeforces, Kuroni has to solve the following problem.

Given a sequence a[1],a[2],a[3]......a[n], your job is to calculate the max sum of a sub-sequence. For example, given (6,-1,5,4,-7), the max sum in this sequenc...

It is Professor R’s last class of his teaching career. Every time Professor R taught a class, he gave a special problem for the students to solve. You being his...

Emuskald is addicted to Codeforces, and keeps refreshing the main page not to miss any changes in the "recent actions" list. He likes to read thread conversatio...