编程介的小学生 2018-12-30 11:57 采纳率: 20.3%
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请问xor怎么异或计算下面这个问题,计算x xor y的最大值

Problem Description
Claris loves bitwise operations very much, especially XOR, because it has many beautiful features. He gets four positive integers a,b,c,d that satisfies a≤b and c≤d. He wants to choose two integers x,y that satisfies a≤x≤b and c≤y≤d, and maximize the value of x XOR y. But he doesn't know how to do it, so please tell him the maximum value of x XOR y.

Input
The first line contains an integer T(1≤T≤10,000)——The number of the test cases.
For each test case, the only line contains four integers a,b,c,d(1≤a,b,c,d≤1018). Between each two adjacent integers there is a white space separated.

Output
For each test case, the only line contains a integer that is the maximum value of x XOR y.

Sample Input
2
1 2 3 4
5 7 13 15

Sample Output
6
11

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  • threenewbee 2019-09-15 23:50
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