poj3983 0ms 暴力模拟

#include<cstdio>
#include<cmath>
using namespace std;
//暴力模拟，括号有5种，符号有64种，一共5*64，所以暴力
#define rep(i,a,b) for(int i = a;i<b;++i)
#define EPS 1e-6
char operators[4]= {'+','-','*','/'};
double Tran(double a,int oper,double b)
{
    switch(operators[oper])
    {
    case '+':
        return a+b;
        break;
    case '-':
        return a-b;
        break;
    case '*':
        return a*b;
        break;
    case '/':
        return a/b;
        break;
    }
}
int Cal(int i,int j,int k,double a,double b,double c,double d)
{
    if(fabs(Tran(Tran(a,i,b),j,Tran(c,k,d))-24.0)<=EPS)
    {
        printf("(%.0f%c%.0f)%c(%.0f%c%.0f)\n",a,operators[i],b,operators[j],c,operators[k],d);
        return 1;
    }
    if(fabs(Tran(Tran(Tran(a,i,b),j,c),k,d)-24.0)<=EPS)
    {
        printf("((%.0f%c%.0f)%c%.0f)%c%.0f\n",a,operators[i],b,operators[j],c,operators[k],d);
        return 1;
    }
    if(fabs(Tran(Tran(a,i,Tran(b,j,c)),k,d)-24.0)<=EPS)
    {
        printf("(%.0f%c(%.0f%c%.0f))%c%.0f\n",a,operators[i],b,operators[j],c,operators[k],d);
        return 1;
    }
    if(fabs(Tran(a,i,Tran(Tran(b,j,c),k,d))-24.0)<=EPS)
    {
        printf("%.0f%c((%.0f%c%.0f)%c%.0f)\n",a,operators[i],b,operators[j],c,operators[k],d);
        return 1;
    }
    if(fabs(Tran(a,i,Tran(b,j,Tran(c,k,d)))-24.0)<=EPS)
    {
        printf("%.0f%c(%.0f%c(%.0f%c%.0f))\n",a,operators[i],b,operators[j],c,operators[k],d);
        return 1;
    }
    return 0;
}
int main()
{
    double a,b,c,d;
    while(~scanf("%lf%lf%lf%lf",&a,&b,&c,&d))
    {
        rep(i,0,4)
        {
            rep(j,0,4)
            {
                rep(k,0,4)
                {
                   // printf("%f",EPS);
                    if(Cal(i,j,k,a,b,c,d))
                        goto success;
                }
            }
        }
success:
        continue;
    }
    return 0;
}