为什么老是wrong answer呢  测试数据都过了啊。
答案输入需要是字符串吗，我是一位一位输出整数。

// sxmatchACM.cpp : Defines the entry point for the console application.
//

#include <iostream>
#include <string>
#include <vector>
using namespace std;

static int finalfloat=0;
static bool purefloat=false;
vector<int> computer(string a,int b){
    
        vector<int> v1;
		vector<int> v2;
 		vector<int> result;
		string::iterator ite1 = a.end();
		string::iterator ite = a.begin();
		int temp=0;
		int floatcountTemp=0;
		ite1--;

		

		while(true){

            if(*ite==46){
			   purefloat=true;
				break;
			}

			if(*ite-48==0&&*(ite+1)==48)
			{
				ite=ite+1;
				if(ite==ite1)
				{
					result.push_back(0);
					return result;
				}
			}

			if(*ite-48==0&&*(ite+1)!=48&&*(ite+1)!=46)
			{
				ite=ite+1;
				break;
			}
		
			if(*ite-48==0&&*(ite+1)==46){

                while(true)
				{
						if(*ite1-48==0){
							ite1--;
						}else if(*ite1-48!=0){
							purefloat=true;
							break;
						}

						if(*ite1==46)
						{
							result.push_back(0);
							return result;
						}
		
				}
		     	
		     	break;
			}
			
			if(*ite!=48)
				break;
				
		}

        int isPlot=a.find(".");
		while(isPlot>=0&&isPlot<a.length())
		{
           	if(*ite1-48==0){
				ite1--;
			}else if(*ite1-48!=0){
				break;
			}
		
		}
			
	
		while(true){

		
			
			if(*ite1-48==-2){
                finalfloat=floatcountTemp*b;
				if(ite1==ite)
					break;
				ite1--;
			  continue;
			}
			floatcountTemp++;
		 v1.push_back((*ite1-48));
		// cout<<(*ite1-48)<<endl;
		 
		 if(ite1==ite)
			 break;
		 ite1--;
		}




		v2=v1;
	while((b-1)>0)
	{
        vector<int>::iterator ite2=v1.begin();
		vector<int>::iterator ite3=v1.end();
		vector<int> tempV;
		int count1=1;
		 int number=0;
		while(true)
		{
			 vector<int>::iterator ite4=v2.begin();
		     vector<int>::iterator ite5=v2.end();
		   	
			 while(true)
			 {
				
                 int temp1=(*ite2)*(*ite4);
				 if(count1==1){
			     tempV.push_back(temp1%10+temp);
				 temp=temp1/10;
				 }else{
				//	cout<<"number is "<<number<<endl;
					int temp2=(tempV[number]+temp1%10+temp);
                    tempV[number]=temp2%10;
					temp=temp1/10+temp2/10;
					number++;

				 }
				 ite4++;
				 if(ite4==ite5)
					 break;
			 }
			 number=count1;
			 tempV.push_back(temp);
			 count1++;
			 ite2++;
			 temp=0;
			 if(ite2==ite3)
				 break;
		     
		}
		v2=tempV;
        temp=0;

         




		b--;
	   
	}
    
	vector<int>::iterator v2end=v2.end();
	while(true)
	{
	  if(*(v2end-1)==0&&*(v2end-2)!=0){
	  v2.pop_back();
	  break;
	  } 
	  
	  if(*(v2end-1)==0&&*(v2end-2)==0){
	    v2.pop_back();
		v2end=v2.end();
	  }

	  if(*(v2end-1)!=0)
		  break;
    }

	
	return v2;
     
}

int main(int argc, char* argv[])
{   
	string a;
	int b;

    
	while(cin>>a>>b)
	{
	   if(b<=0||b>25)
		{
		//	cout<<"you put the second number is not vaild.(0,25] is ok,please input the number again"<<"\n";
		}else{
		   break;
		}
	}

	vector<int> finalResult=computer(a,b);
    vector<int>::iterator ite1=finalResult.begin();
    vector<int>::iterator ite2=finalResult.end();
	int length =finalResult.size();
	ite2--;
	int count1=0;

	if(purefloat){
		cout<<".";
		for(int i=0;i<finalfloat-length;i++)
			cout<<0;
		
	}
	while(true)
	{
	
	
		cout<<(*ite2);
		count1++;
		if(ite2==ite1){
			cout<<endl;
		   break;
		}
	
		if(!purefloat&&count1==length-finalfloat)
			cout<<".";

		

	
		if(--ite2==ite1)
		{
			cout<<*ite2<<endl;
			break;
		}
	}
	
	return 0;
}