HDU 5810 Balls and Boxes

时间:2022-04-13 06:49:54

n*(m-1)/(m*m)

#pragma comment(linker, "/STACK:1024000000,1024000000")
#include<cstdio>
#include<cstring>
#include<cmath>
#include<algorithm>
#include<vector>
#include<map>
#include<set>
#include<queue>
#include<stack>
#include<iostream>
using namespace std;
typedef long long LL;
const double pi=acos(-1.0),eps=1e-;
void File()
{
freopen("D:\\in.txt","r",stdin);
freopen("D:\\out.txt","w",stdout);
}
inline int read()
{
char c = getchar(); while(!isdigit(c)) c = getchar(); int x = ;
while(isdigit(c)) { x = x * + c - ''; c = getchar(); }
return x;
} LL n,m;
LL gcd(LL a,LL b){ if(b==)return a; return gcd(b,a%b); } int main()
{
while(~scanf("%lld%lld",&n,&m))
{
if(n==&&m==) break;
LL x1=n*(m-),x2=m*m ;
LL GCD=gcd(x1,x2);
if(x1==) printf("0/1\n");
else printf("%lld/%lld\n",x1/GCD,x2/GCD);
}
return ;
}