problem

A. XORwice
time limit per test1 second
memory limit per test256 megabytes
inputstandard input
outputstandard output
In order to celebrate Twice’s 5th anniversary, Tzuyu and Sana decided to play a game.

Tzuyu gave Sana two integers a and b and a really important quest.

In order to complete the quest, Sana has to output the smallest possible value of (a⊕x) + (b⊕x) for any given x, where ⊕ denotes the bitwise XOR operation.

Input
Each test contains multiple test cases. The first line contains the number of test cases t (1≤t≤104). Description of the test cases follows.

The only line of each test case contains two integers a and b (1≤a,b≤109).

Output
For each testcase, output the smallest possible value of the given expression.

Example
inputCopy
6
6 12
4 9
59 832
28 14
4925 2912
1 1
outputCopy
10
13
891
18
6237
0
Note
For the first test case Sana can choose x=4 and the value will be (6⊕4) + (12⊕4) = 2+8 = 10. It can be shown that this is the smallest possible value.

solution

#include<bits/stdc++.h>
using namespace std;
int main(){
  int T;  cin>>T;
  while(T--){
    long long a, b;
    cin>>a>>b;
    cout<<(a^b)<<endl;
  }
  return 0;
}