Problem about GCD Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 470 Accepted Submission(s): 77 Problem Description Given integer m. Find multiplication of all 1<=a<=m such gcd(a, m)=1 (cop…
近来刚学JAVA,就从JAVA写起吧,JAVA判别素数,其实方法和C/C++没什么区别,主要就是想谈一下,其中包括的3个点. (1)JAVA语言产生随机数,random函数,定义参数max的作用是给出最大随机数的生成范围,当然也可以产生一组随机数,定义数组mat[],在random中定义int n, int max,n代表生成数组里有几个随机数,max还是生成范围. (2)素数判断.1,2,是素数,给出单独的判断.生成随机数后,根据素数定义,除了1和本事之外没有别的除数,所以从2开始到int…
//根据定义判断素数---循环n-1次,当n很大时循环n次 public static void main(String[] args) { // TODO Auto-generated method stub Scanner in = new Scanner(System.in); boolean isPrime = true; int x = in.nextInt(); if(x == 1) { …
题意: 判断从[2,N]中是否有超过[包括]K个数满足:等于一加两个相邻的素数. 思路: 枚举. 也可以:筛完素数,枚举素数,直到相邻素数和超过N.统计个数 代码: int n,k; int prime[1005]; int cn=0; bool isPrime(int x){ if(x==2) ret true; for(int i=2;i*i<=x;++i) if(x%i==0) ret false; ret true; } void sieve(){ rep(i,2,n){ if(isPr…
Problem Description A ring is compose of n circles as shown in diagram. Put natural number 1, 2, -, n into each circle separately, and the sum of numbers in two adjacent circles should be a prime. Note: the number of first circle should always be 1.…
Prime Ring Problem Time Limit : 4000/2000ms (Java/Other) Memory Limit : 65536/32768K (Java/Other) Total Submission(s) : 18 Accepted Submission(s) : 7 Problem Description A ring is compose of n circles as shown in diagram. Put natural number 1, 2,…
Prime Ring Problem Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 20105 Accepted Submission(s): 9001 Problem Description A ring is compose of n circles as shown in diagram. Put natural numb…
Longge's problem Description Longge is good at mathematics and he likes to think about hard mathematical problems which will be solved by some graceful algorithms. Now a problem comes: Given an integer N(1 < N < 2^31),you are to calculate ∑gcd(i,…
传送门: http://acm.hdu.edu.cn/showproblem.php?pid=1016 Prime Ring Problem Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 63806 Accepted Submission(s): 27457 Problem Description A ring is compos…
Primes Problem Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 2016 Accepted Submission(s): 928 Problem Description Given a number n, please count how many tuple(p1, p2, p3) satisfied that p…
Prime Ring Problem Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 74594 Accepted Submission(s): 31690 Problem Description A ring is compose of n circles as shown in diagram. Put natural numb…
最近忙于考试复习,没有多少可供自己安排的时间,所以我利用复习之余的空闲时间去刷刷杭电acm的题目,也当对自己编程能力的锻炼吧. Problem Description I have a very simple problem for you. Given two integers A and B, your job is to calculate the Sum of A + B. Input The first line of the input contains an integer T(1…
素数判定 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 87861 Accepted Submission(s): 30699 Problem Description 对于表达式n^2+n+41,当n在(x,y)范围内取整数值时(包括x,y)(-39<=x<y<=50),判定该表达式的值是否都为素数. Input 输入数…