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- #include <bits/stdc++.h>
- using namespace std;
- #define ll long long
- #define test int t; cin>>t; for(int cs=1;cs<=t;cs++)
- int main()
- {
- ios_base::sync_with_stdio(0);
- cin.tie(0);cout.tie(0);
- test
- {
- ll a,c,d,e,i,j,k,l;
- cin>>a>>c;
- d=(a^a)+(c^a);
- e=(a^c)+(c^c);
- cout<<min(d,e)<<endl;
- }
- return 0;
- }
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