FERT21_0.cpp

#include <cstdio>
#include <iostream>
#include <cstring>
#include <string>
#include <cmath>
#include <algorithm>
#include <climits>
#include <cfloat>
#include <map>
#include <fstream>
#include <sstream>
#include <bits/stdc++.h>
#include <climits>
using namespace std;
string arr[1009];
string multiply(string s,int a)
{
	int i,carry=0,j;
	string temp;
	char c;
	for(i=s.size() - 1;i>=0;i--)
	{
		j= s[i] - 48;
		c = (j*a + carry)%10 + 48;
		carry = (j*a + carry)/10;
		temp = c + temp;
	}
	if(carry!=0)
		c=carry+48,temp=c+temp;
	return temp;
}
void pre()
{
	arr[0] =49;
	for(int i=1;i<=1000;i++)
		arr[i] = multiply(arr[i-1],5);
}
int main()
{
	int t;
	scanf("%d",&t);
	pre();
	while(t--)
	{
		int n,l,p;
		ios_base::sync_with_stdio(false);
		scanf("%d",&n);
		if(n==1)
			cout<<"1"<<endl;
		else
		{
			cout<<"0.";
			p=arr[n-1].size();
			l= abs((n-1) - p);
			for(int i=0;i<l;i++)
				cout<<"0";
			cout<<arr[n-1]<<endl;
		}
	}
	return 0;
}