hdu 3949 XOR 求第K小异或值

Problem Description

XOR is a kind of bit operator, we define that as follow: for two binary base number A and B, let C=A XOR B, then for each bit of C, we can get its value by check the digit of corresponding position in A and B. And for each digit, 1 XOR 1 = 0, 1 XOR 0 = 1, 0 XOR 1 = 1, 0 XOR 0 = 0. And we simply write this operator as ^, like 3 ^ 1 = 2,4 ^ 3 = 7. XOR is an amazing operator and this is a question about XOR. We can choose several numbers and do XOR operatorion to them one by one, then we get another number. For example, if we choose 2,3 and 4, we can get 2^3^4=5. Now, you are given N numbers, and you can choose some of them(even a single number) to do XOR on them, and you can get many different numbers. Now I want you tell me which number is the K-th smallest number among them.

 

Input

First line of the input is a single integer T(T<=30), indicates there are T test cases.
For each test case, the first line is an integer N(1<=N<=10000), the number of numbers below. The second line contains N integers (each number is between 1 and 10^18). The third line is a number Q(1<=Q<=10000), the number of queries. The fourth line contains Q numbers(each number is between 1 and 10^18) K1,K2,......KQ.

 

Output

For each test case,first output Case #C: in a single line,C means the number of the test case which is from 1 to T. Then for each query, you should output a single line contains the Ki-th smallest number in them, if there are less than Ki different numbers, output -1.

 

Sample Input

   
   
   
   

    
    
    
    2
2
1 2
4
1 2 3 4
3
1 2 3
5
1 2 3 4 5
   
   
   
   

 

Sample Output

   
   
   
   

    
    
    
    Case #1:
1
2
3
-1
Case #2:
0
1
2
3
-1


    
    
    
    
 
     
 
      Hint 
     
 If you choose a single number, the result you get is the number you choose. Using long long instead of int because of the result may exceed 2^31-1. 
    
   
   
   
   

//

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
#define bignum long long
const int maxn=11000;
//求a中第k小异或值(a[i]可单独取)
bignum a[maxn];
int n;//0->n-1
int l;//线性基个数
//将a[i]写成2进制形式,化简成标准行列式形式(左上角E,右下角0)
void Gauss(const int m=62)
{
    l=0;
    for(int i=m;i>=0;i--)//位数
    {
        int flag=0;
        for(int j=l;j<n;j++)
        {
            if(a[j]&(1LL<<i))//1LL  important
            {
                swap(a[l],a[j]);flag=1;break;
            }
        }
        if(flag)
        {
            for(int j=0;j<n;j++)
            {
                if(j!=l&&(a[j]&(1LL<<i))) a[j]^=a[l];
            }
            l++;
        }
    }
}
bignum calc(bignum k,const int m=62)
{
   //0特殊处理
   if(l<n)//存在异或值为0
   {
       if(k==1) return 0;
       else k--;
   }
   if(k>=(1LL<<l)) return -1;
   bignum cnt=0;
   for(int i=0;i<=m;i++)
   {
       if(k&(1LL<<i)) cnt^=a[l-i-1];
   }
   return cnt;
}
int main()
{
    int ci,pl=1;scanf("%d",&ci);
    while(ci--)
    {
        scanf("%d",&n);
        for(int i=0;i<n;i++) scanf("%I64d",&a[i]);
        Gauss();
        int q;scanf("%d",&q);
        printf("Case #%d:\n",pl++);
        while(q--)
        {
            bignum k;scanf("%I64d",&k);
            printf("%I64d\n",calc(k));
        }
    }
    return 0;
}