Problem Description As you know, Gardon trid hard for his love-letter, and now he’s spending too much time on choosing flowers for Angel. When Gardon entere...

Problem Description Tomorrow is contest day, Are you all ready? We have been training for 45 day

Problem Description Goldbach’s Conjecture: For any even number n greater than or equal to 4, there exists at least one pair of prime numbers p1 and p2 such th...

Problem Description Give a number n, find the minimum x(x>0) that satisfies 2^x mod n = 1.

Problem Description A weird clock marked from 0 to 59 has only a minute hand. It won’t move until a special coin is thrown into its box. There are different k...

Problem Description Starting from point (0,0) on a plane, we have written all non-negative integers 0, 1, 2,… as shown in the figure. For example, 1, 2, and 3...

Problem Description As part of an arithmetic competency program, your students will be given randomly generated lists of from 2 to 15 unique positive integers...

Problem Description 一个正整数，如果从左向右读（称之为正序数）和从右向左读（称之为倒序数）是一样的，这样的数就叫回文数。任取一个正整数，如果不是回文数，将该数与他的倒序数相加，若其和不是回文数，则重复上述步骤，一直到获得...

Problem Description 数论中有许多猜想尚未解决，其中有一个被称为“角谷猜想”的问题，该问题在五、六十年代的美国多个著名高校中曾风行一时，这个问题是这样描述的：任何一个大于一的自然数，如果是奇数，则乘以三再加一；如果...

Problem Description 今天的上机考试虽然有实时的Ranklist，但上面的排名只是根据完成的题数排序，没有考虑 每题的分值，所以并不是最后的排名。给定录取分数线，请你写程序找出最后通过分数线的 考生，并将他们的成绩按降...