B - The Large Family+暴力枚举

#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;

int main()
{
    int G;
    while(cin>>G)
    {
         if(!G)
            break;
         int k=G*2;
         int n1=(k-2)/7;
         int n2=(k+2)/7;
         double ans;
         int t=k/7;
         if(k-7*n1-2<k-7*n2+2)
         {
             if(k-7*t<k-7*n1-2)
             {
                 printf("%.1lf ",(k-7*t)*0.5);
                 printf("%.1lf %.1lf %.1lf\n",t*0.5,t*0.5,t*0.5);
                 continue;
             }
             printf("%.1lf ",(k-7*n1-2)*0.5);
             printf("%.1lf %.1lf %.1lf\n",(n1+1)*0.5,(n1+1)*0.5,n1*0.5);

         }
         else
         {
             if(k-7*t<k-7*n2+2)
             {
                 printf("%.1lf ",(k-7*t)*0.5);
                 printf("%.1lf %.1lf %.1lf\n",t*0.5,t*0.5,t*0.5);
                 continue;
             }
             printf("%.1lf ",(k-7*n2+2)*0.5);
             printf("%.1lf %.1lf %.1lf\n",(n2-1)*0.5,(n2-1)*0.5,n2*0.5);
         }
    }
 return 0;
}