https://ac.nowcoder.com/acm/contest/358/B?

題解：?

參考文章：

https://blog.csdn.net/weixin_43272781/article/details/86547839

?https://blog.csdn.net/weixin_43272781/article/details/86547908

/* *@Author: STZG *@Language: C++ */ #include <bits/stdc++.h> #include<iostream> #include<algorithm> #include<cstdlib> #include<cstring> #include<cstdio> #include<string> #include<vector> #include<bitset> #include<queue> #include<deque> #include<stack> #include<cmath> #include<list> #include<map> #include<set> //#define DEBUG #define RI register int using namespace std; typedef long long ll; //typedef __int128 lll; const int N=100000+10; const int MOD=1e9+7; const double PI = acos(-1.0); const double EXP = 1E-8; const int INF = 0x3f3f3f3f; ll t,n,m,k,q,x,y; int ans,cnt,flag,temp; //int a[N]; char str; ll gcd(ll a,ll b){while(b){ll r=a%b;a=b;b=r;}return a; } int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endifwhile(~scanf("%lld%lld%lld%lld%lld",&n,&m,&x,&y,&t)){ll a=m*x*(x-1)*(m-1)+n*y*(y-1)*(n-1);ll b=(x*m+y*n)*(m-1)*(n-1);ll gcdab=gcd(b,a);a/=gcdab;b/=gcdab;if(t)printf("%lld/%lld\n",a,b);elseprintf("%.3f\n",1.0*a/b);}//scanf("%d",&t);//while(t--){}//cout << "Hello world!" << endl;return 0; }

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