GCD & LCM Inverse Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 10621 Accepted: 1939 Description Given two positive integers a and b, we can easily calculate the greatest common divisor (GCD) and the least common multiple (LCM) of a…
II U C ONLINE C ON TEST Problem D: GCD LCM Input: standard input Output: standard output The GCD of two positive integers is the largest integer that divides both the integers without any remainder. The LCM of two positive integers is the smalle…
题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=3071 题目大意: 给定一个长度为n的序列m次操作,操作的种类一共有三种 查询 L :查询一个区间的所有的数的最小公倍数modp G :查询一个区间的所有的数的最大公约数modp 修改 C :将给定位置的值修改成x 解题思路: 注意数据范围,每个数字不超过100,所以100以内的质因子最多25个,如果直接求解lcm和gcd的话,long long也是存不下的,所以采用存储质因子的指数,但是如果每个节…
(链接点这儿) 题目: The GCD of two positive integers is the largest integer that divides both the integers without any remainder. The LCM of two positive integers is the smallest positive integer that is divisible by both the integers. A positive integer can…
UVA11388 GCD LCM Description of the title PDF The GCD of two positive integers is the largest integer that divides both the integers without any remainder. The LCM of two positive integers is the smallest positive integer that is divisible by both th…
Given two positive integers a and b, we can easily calculate the greatest common divisor (GCD) and the least common multiple (LCM) of a and b. But what about the inverse? That is: given GCD and LCM, finding a and b. Input The input contains multiple…
我一直相信这道题有十分巧妙的解法的,去搜了好多题解发现有的太过玄妙不能领会. 最简单的就是枚举n的所有约数,然后二重循环找lcm(a, b) = n的个数 #include <cstdio> #include <vector> #include <algorithm> using namespace std; ? a : gcd(b, a % b); } int lcm(int a, int b) { return a / gcd(a, b) * b; } int ma…
先介绍两个: 大数的Gcd Stein+欧几里德 function stein(a,b:int64):int64; begin if a<b then exit(stein(b,a)); then exit(a); )=) )=) ,b>>)<<); )= ,b)); )= )); exit(stein((a+b)>>,(a-b)>>)); end; 小数的Gcd 辗转相除法 function stein(a,b:int64):int64; begin…
Description 众所周知,我是好人!所以不会出太难的题,题意很简单 给你两个数n和m,问你有多少对正整数对最大公约数是n,最小公倍数是m最后友情提供解题代码(我真是太好人了) void solve() { long long n, m; scanf("%lld%lld", &n, &m); ; ; i <= m; i++) { for (long long j = i; j <= m; j++) { if (gcd(i, j) == n &&…
input T 1<=T<=1000 x y output 有多少个起点可以走n(n>=0)步走到(x,y),只能从(x,y)走到(x,y+lcm(x,y))/(x+lcm(x,y),y) 标准解:从(x,y0)走到(x,y),则设x=ag,y0=bg,g=gcd(x,y0),有y=bg+abg=(a+1)bg,因为a,b互质,a,(a+1)互质,所以a和(a+1)b互质,所以若可以从(x,y0)走到(x,y),有gcd(x,y0)=gcd(x,y),然后将x和y中gcd(x,y)除去之…
Least Common Multiple Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 53016 Accepted Submission(s): 20171 Problem Description The least common multiple (LCM) of a set of positive integers is…
定理:gcd(a,b)*lcm(a,b)=a*b; 更相损减术:gcd(a,b)=gcd(b,a-b)=gcd(a,a-b) 欧几里得算法:gcd(a,b)=gcd(b,a mod b) 复杂度O(log(a+b)) int gcd(int a,int b){return b?gcd(b,a%b):a;}…
