Problem I. XOR
时间限制 1000 ms
内存限制 32 MB
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.
输入数据
输出数据
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.
样例输入
复制
2
2
1 2
4
1 2 3 4
3
1 2 3
5
1 2 3 4 5
样例输出
复制
Case #1:
1
2
3
-1
Case #2:
0
1
2
3
-1
样例说明
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.
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