#include<bits/stdc++.h>
#define int double
using namespace std;
signed main(){
	int n,a,b;
	cin>>n;
	b=n*4.8;
	if(n<=2)a=n*5;
	else a=10+(n-2)*4;
	if(a<b)cout<<"甲店";
	else if(a>b){
		cout<<"乙店 ";
		cout<<fixed<<setprecision(1)<<b;
	}
	else cout<<"一样";
}

什么啊怎么没数据：

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n;
	cin>>n;
	if(min(2,n)*5+(n-2)*5*0.8<n*8*0.6)
	{
		cout<<"甲 ";
		printf("%.1f",min(2,n)*5+(n-2)*5*0.8);
	}
	else
	{
		cout<<"乙 ";
		printf("%.1f",n*8*0.6);
	}
	return 0;
}