Description In mathematics, the greatest common divisor (gcd), also known as the greatest common factor (gcf), highest common factor (hcf), or greatest common measure (gcm), of two or more integers (when at least one of them is not zero), is the larg…

Revenge of GCD In mathematics, the greatest common divisor (gcd), also known as the greatest common factor (gcf), highest common factor (hcf), or greatest common measure (gcm), of two or more integers (when at least one of them is not zero), is the l…

Revenge of GCD Problem Description In mathematics, the greatest common divisor (gcd), also known as the greatest common factor (gcf), highest common factor (hcf), or greatest common measure (gcm), of two or more integers (when at least one of them is…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5019 Problem Description In mathematics, the greatest common divisor (gcd), also known as the greatest common factor (gcf), highest common factor (hcf), or greatest common measure (gcm), of two or more i…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5019 题目意思:给出 X 和 Y,求出 第 K 个 X 和 Y 的最大公约数. 例如8 16,它们的公约数依次为1 2 4 8,那么第 3 个 GCD(X, Y) = 2,也就是从后往前数第3个公共因子. TLE思路:求出 X 的所有因子(从小到大开始存储),再从后往前枚举这些因子,检查是否也为 Y 的因子,统计到第 K 个数就是答案了......以为可以顺利通过,原来数据量还是非常大滴!!! 正确…

题解:筛出约数,然后计算即可. #include <cstdio> #include <algorithm> typedef long long LL; LL a1[1000005],a2[1000005],x,y,k,g; int cnt1,cnt2,T; LL gcd(LL a,LL b){if(b==0)return a;else return gcd(b,a%b);} int main(){ scanf("%d",&T); while(T--){…

题意: 给你两个数:X和Y  .输出它们的第K大公约数.若不存在输出 -1 数据范围: 1 <= X, Y, K <= 1 000 000 000 000 思路: 它俩的公约数一定是gcd(X,Y)的因数.(把它俩分解成质因数相乘的形式就可以看出) 故找出gcd(x,y)所有的因数,从大到小排序,输出第K个即可. 代码: #include <cstdio> #include <iostream> #include <string.h> #include &l…

Revenge of GCD Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2140    Accepted Submission(s): 596 Problem Description In mathematics, the greatest common divisor (gcd), also known as the greate…

OC中的三种定时器:CADisplayLink.NSTimer.GCD 我们先来看看CADiskplayLink, 点进头文件里面看看, 用注释来说明下 @interface CADisplayLink : NSObject { @private void *_impl; //指针 } + (CADisplayLink *)displayLinkWithTarget:(id)target selector:(SEL)sel;//唯一一个初始化方法 - (void)addToRunLoop:(NS…

在iOS开发中,遇到耗时操作,我们经常用到多线程技术.Grand Central Dispatch (GCD)是Apple开发的一个多核编程的解决方法,只需定义想要执行的任务,然后添加到适当的调度队列(dispatch queue).GCD会负责创建线程和调度你的任务,系统直接提供线程管理. 一.队列: 基本概念: 1.GCD的一个重要概念是队列,它的核心理念:将长期运行的任务拆分成多个工作单元,并将这些单元添加到dispath queue中,系统会为我们管理这些dispath queue,为我…