File size: 1,179 Bytes
6fc1bdb |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 |
You are given three non-negative integers $b$, $c$, and $d$.
Please find a non-negative integer $a \in [0, 2^{61}]$ such that $(a\, |\, b)-(a\, \&\, c)=d$, where $|$ and $\&$ denote the [bitwise OR operation](https://en.wikipedia.org/wiki/Bitwise_operation#OR) and the [bitwise AND operation](https://en.wikipedia.org/wiki/Bitwise_operation#AND), respectively.
If such an $a$ exists, print its value. If there is no solution, print a single integer $-1$. If there are multiple solutions, print any of them.
Each test contains multiple test cases. The first line contains the number of test cases $t$ ($1 \le t \le 10^5$). The description of the test cases follows.
The only line of each test case contains three positive integers $b$, $c$, and $d$ ($0 \le b, c, d \le 10^{18}$).
For each test case, output the value of $a$, or $-1$ if there is no solution. Please note that $a$ must be non-negative and cannot exceed $2^{61}$.
In the first test case, $(0\,|\,2)-(0\,\&\,2)=2-0=2$. So, $a = 0$ is a correct answer.
In the second test case, no value of $a$ satisfies the equation.
In the third test case, $(12\,|\,10)-(12\,\&\,2)=14-0=14$. So, $a = 12$ is a correct answer. |