本地全过，提交RE（除0错误）

#include<iostream>
using namespace std;
long long gcd(long long a,long long b){
	if(a==0&&b==0)return -1;
	if(a<0)a=-a;
	if(b<0)b=-b;
	if(b==0)return a;
	return gcd(b,a%b);
}
int main(void){
	long long n,a,b,op,fm,fz,gcdx;
	bool fs=false;
	cin>>n;
	for(int i=0;i<n;i++){
		fs=false;
		cin>>a>>b>>op;
		if(op==1){
			fz=fz*b+a*fm;fm=fm*b;
			gcdx=gcd(fz,fm);
			fz/=gcdx,fm/=gcdx;
		}else{
			fz=fz*b-a*fm;fm=fm*b;
			gcdx=gcd(fz,fm);
			fz/=gcdx,fm/=gcdx;
		}
	}
	if(fz%fm)cout<<fz<<'/'<<fm;
	else cout<<fz/fm;
	cout<<endl;
	return 0;
}