算各种点数

#include<iostream>
#include<string>
#include<cstdlib>
#include<cmath>
#include<cstdio>
using namespace std;
const double Threshold=1E-6;
const int CardsNumber=4;
const int ResultValue=24;
int number[6];
string result[CardsNumber];
bool PointsGame(int n)
{
 	if(n==1)
 	{
 		if(fabs(number[0]-ResultValue)<Threshold)
  		{
   			cout<<result[0]<<endl;
   			return true;
  		}
  		else
  		{
  			return false;
 		}			
 	}
 	for(int i=0;i<n;i++)
 	{
  		for(int j=i+1;j<n;j++)
  		{
   			int a,b;
   			string expa,expb;
  			a=number[i];
   			b=number[j];
   			number[j]=number[n-1];

   			expa=result[i];
   			expb=result[j];
   			result[j]=result[n-1];

   			result[i]='('+expa+'+'+expb+')';
   			number[i]=a+b;
   			if(PointsGame(n-1))
    		return true;

   			result[i]='('+expa+'-'+expb+')';
   			number[i]=a-b;
   			if(PointsGame(n-1))
   				return true;

			result[i]='('+expb+'-'+expa+')';
   			number[i]=b-a;
   			if(PointsGame(n-1))
   				return true;

		    result[i]='('+expa+'*'+expb+')';
		    number[i]=a*b;
		    if(PointsGame(n-1))
		    return true;

		    if(b!=0)
		    {
 		      	result[i]='('+expa+'/'+expb+')';
		 		number[i]=a/b;
		   		if(PointsGame(n-1))
		   			return true;
		    }
		
		    	if(a!=0)
		    	{
		    		result[i]='('+expb+'/'+expa+')';
		    		number[i]=b/a;
		    		if(PointsGame(n-1))
		    		return true;
		 		}
		
			    number[i]=a;
			    number[j]=b;
			    result[i]=expa;
			    result[j]=expb;
		  }
	}
	return false;
}
int main()
{
	 int x;
	 char ss[5];
	 int nn;
	 int a,b,c,d;
	 while(scanf("%d%d%d%d",&a,&b,&c,&d)!=EOF){
	 	//if(nn==0) break;
	 	int flag=1;
	 
	 //while(nn--){
	 	
		//scanf("%s",ss);
	 	number[0]=a;
	 	number[1]=b;
	 	number[2]=c;
	 	number[3]=d;
	 	
	 	
		for(int i=0;i<CardsNumber;i++)
		 {
		  	char buffer[20];
		  	//cout<<"the "<<i<<"th number:";
		  
		  	//number[i]=ss[i]-'0';
		  	x=number[i];
		  	itoa(x,buffer,10);
		  	result[i]=buffer;
		 }
		 
		 if(PointsGame(CardsNumber))
		 {
		    if(flag==1) flag=1;
			else flag=0;                
		 }
		 else
		 {
		     flag=0;  
		 }
	
		if(flag==1) cout<<"Yes"<<endl;
		else if(flag==0) cout<<"No"<<endl;
	}
 
 return 0;
}