rt。

玄学事件，如下代码将freopen注释后可以正常跑出答案，不注释就跑不出了，并且好像爆炸了。求大佬解答。

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define int ll
int a,b,c;
inline int lcm(int x,int y){
	return x/__gcd(x,y)*y;
}
signed main(){
	freopen("circle.in","r",stdin);
	freopen("circle.out","w",stdout);
	cin>>a>>b>>c;
	int d=lcm(a,lcm(b,c));
    int A=d/a,B=d/b,C=d/c;
	int tmp=__gcd(A-B,B-C);
    int p=__gcd(tmp,d);
	cout<<(d/p)<<"/"<<(tmp/p)<<"\n";
}