POJ1023 The Fun Number System

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

string str;;
__int64 N;
int k;
int result[100];
int index = 0;

int main()
{
    int t,i;
    cin>>t;
    while(t--)
    {
        cin >> k;
        cin >> str;
        cin >> N;
        for(i = k-1;i >= 0; --i)
        {
            if((N%2==1) || (N%2 == -1))
            {//奇数
                
                if(str[i] == 'p')
                {//减1
                    N-=1;
                    N/=2;
                }
                else if (str[i] == 'n')
                {//加1
                    N+=1;
                    N/=2;
                }
                result[index++] = 1;
            }
            else
            {//偶数
                N/=2;
                result[index++] = 0;
            }
        }
        if(N != 0)
        {
            cout<<"Impossible";
        }
        else
        {
            for(i = k-1; i >= 0; --i)
            {
                cout << result[i];
            }
        }
        cout << endl;
        index = 0;
    }
    return 0;
}