题目链接:http://codeforces.com/contest/922/problem/F 题目大意: 对于一个数集 \(I\),定义 \(f(I)\) 为 \(I\) 中满足条件的数对\((a,b)\)的个数:\(a<b\) 并且 \(a|b\). 要求构造一个数集 \(I\),数集中元素大于 \(0\) 小于等于 \(n\),并且 \(f(I) = k\). 知识点: 构造 解题思路: 用一种类似素数筛的方法计算每个数的真因子的个数,顺便把个数累加起来,一旦发现大于等于\(k\)即可停…

C. Divisibility by Eight time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given a non-negative integer n, its decimal representation consists of at most 100 digits and doesn't conta…

Clique in the Divisibility Graph time limit per test1 second memory limit per test256 megabytes inputstandard input outputstandard output As you must know, the maximum clique problem in an arbitrary graph is NP-hard. Nevertheless, for some graphs of…

C. Divisibility by Eight Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/550/problem/C Description You are given a non-negative integer n, its decimal representation consists of at most 100 digits and doesn't contain leadin…

Divisibility by Eight time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given a non-negative integer n, its decimal representation consists of at most 100 digits and doesn't contain…

J. Divisibility time limit per test 0.5 seconds memory limit per test 64 megabytes input standard input output standard output IT City company developing computer games invented a new way to reward its employees. After a new game release users start…

A. Divisibility Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/597/problem/A Description Find the number of k-divisible numbers on the segment [a, b]. In other words you need to find the number of such integer values x tha…

Description Consider an arbitrary sequence of integers. One can place + or - operators between integers in the sequence, thus deriving different arithmetical expressions that evaluate to different values. Let us, for example, take the sequence: 17, 5…

Divisibility Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u Submit Status Practice HDU 3335 Appoint description:  System Crawler  (2015-04-10) Description As we know,the fzu AekdyCoin is famous of math,especially in the…

1078 - Integer Divisibility   PDF (English) Statistics Forum Time Limit: 2 second(s) Memory Limit: 32 MB If an integer is not divisible by 2 or 5, some multiple of that number in decimal notation is a sequence of only a digit. Now you are given the n…