> 超级要顶这个。这题好无聊~
> 
> 
你的测试数据我也试了，可是为什么还是wrong answer??下面是代码
// usestok2.cpp -- use the Stock class
// compile with stock2.cpp
#include <iostream>
#include <string>
#include <cstdio>
using namespace std;

	


class ans//求s^n
{
private:
	string s;
	int n;
	int r;//小数点位数

private:
	string result(int n)
	{
		if(n == 0)return "1";
		if(n == 1)
			return s;
		if(n%2 == 0)
			return mul(result(n/2), result(n/2));
		else 
			return mul(mul(result(n/2),result(n/2)), result(1));
	}

	void erase()
	{
		s.erase(s.find_first_of('.'),1);
	}

	void ltrim()
	{
		for(int i = 0; i < s.length(); i++)
		{
			if(s[i] == '0')
			{
				s.erase(i,1);
				i--;
			}
			else
				break;
		}

		if(s.length() == 0)
			s = "0";
	}

	void rtrim()
	{
		for(int i = s.length() - 1; i >= 0; i--)
		{
			if(s[i] == '0')s.erase(i,1);
			else
				break;
		}

	}

	string rtrim(string s)
	{
		for(int i = s.length() - 1; i >= 0; i--)
		{
			if(s[i] == '0')
				s.erase(i,1);
			else
				break;
		}
		return s;
	}

public:
	ans(string ss,int an):n(an),s(ss)
	{
		//s = ::rtrim(ss);
		if(s.find_first_of('.') != string::npos)
		{
			r = s.length() - s.find_first_of('.') - 1;
			erase();
		}
		else
			r = 0;
		
		ltrim();
	}	

	string add(string s1,string s2)
	{
		if(s1.length() < s2.length())
		{
			swap<string>(s1,s2);
		}

		int k = s2.length() - 1;
		int len = s1.length();
		int t,c = 0;
		for(int i = len - 1, j = 0; i >= 0; i--, j++)
		{
			if(k - j >= 0)
			{
				t = s1[i] - '0' + s2[k-j] - '0' + c;
				c = 0;
				if(t >= 10) c = 1;
				s1[i] = t%10 + '0';
			}
			else
			{
				t = s1[i] - '0' + c;
				c = 0;
				if(t >= 10) c = 1;
				s1[i] = t%10 + '0';
			}
		}
		if(c == 1)
			s1.insert(0,"1");
		return s1;
	}

	string mul(string s,int n)//0 <= n <= 9
	{
		if(n == 0)return "0";
		int c = 0,t = 0;
		for(int i = s.length() - 1; i >= 0; i--)
		{
			t = (s[i] - '0')*n + c;
			s[i] = t%10 + '0';
			c = t/10;
		}

		if(c > 0)
			s.insert(0,1,char(c+'0'));
		return s;
	}	

	string mul(string s1,string s2)
	{
		string ts="0",result="";
		for(int i = 0; i < s1.length(); i++)
		{
			ts = mul(s2, s1[i] - '0');			
			result.insert(result.length(),1,'0');
			result = add(result, ts);
		}
		
		return result;
	}

	string mul()
	{
		return mul(s,s);
	}	

	string result()
	{	
		
		string s = result(n);
		int x = r * n;
		if(s.length() >= x)
			s.insert(s.length() - r * n,1,'.');
		else
		{
			s.insert(0,x - s.length(),'0');
			s.insert(0,1,'.');
		}		
		s = rtrim(s);
		if(s[s.length() - 1] == '.')
			s.erase(s.length() - 1,1);
		if(s.length() == 0)
			s = "0";
		return s;
	}
};

	

int main()
{
	string s;
	int n;
	freopen("in.txt","r",stdin);
	while(cin>>s>>n)
	{
		ans as(s,n);
		cout<<as.result()<<endl;
	}
	
    return 0; 
}