E. Anniversary time limit per test2 seconds memory limit per test256 megabytes inputstandard input outputstandard output There are less than 60 years left ...

In the game of Sudoku, you are given a large 9 × 9 grid divided into smaller 3 × 3 subgrids. For example,

定义好数为 3 x 3^{x} 3x加起来的和，给定一个数n，让你求......

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...

We know that prime numbers are positive integers that have exactly two distinct positive divisors. Similarly, we’ll call a positive integer t Т-prime, if t has ...

You have array of nn numbers a1,a2,…,ana1,a2,…,an.

Among all the factors of a positive integer N, there may exist several consecutive numbers. For example, 630 can be factored as 3×5×6×7, where 5, 6, and 7 are t...

本题的基本要求非常简单：给定 N 个实数，计算它们的平均值。但复杂的是有些输入数据可能是非法的。一个“合法”的输入是 [−1000,1000] 区间内的实数，并且最多精确到小数点后 2 位。当你计算平均值的时候，不能把那些非法...

Notice that the number 123456789 is a 9-digit number consisting exactly the numbers from 1 to 9, with no duplication. Double it we will obtain 246913578, which ...

Recently, on the course of algorithms and data structures, Valeriy learned how to use a deque. He built a deque filled with nn elements. The ii-th element is ai...