32 lines
646 B
C++
32 lines
646 B
C++
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#include <bits/stdc++.h>
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using namespace std;
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#define ll long long
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#define endl '\n'
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ll pow(ll x,ll y,ll m=1e9+7){ll ans=1;x%=m;while(y){if(y&1)ans=(ans*x)%m;x=(x*x)%m;y>>=1;}return ans;}
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void solve()
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{
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ll n,m;
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cin>>n>>m;
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ll l=max(0LL,n-m), r= n+m, ans=0;
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for(int i=0; i<32; ++i)
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{
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ll p=l/(1<<i);
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ll q=r/(1<<i);
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if(p&1 || q&1 || p!=q)
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ans |= (1<<i);
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}
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cout<<ans<<endl;
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}
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signed main()
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{
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ios_base::sync_with_stdio(false), cin.tie(nullptr);
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int TCS = 1;
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cin >> TCS;
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for (int TC = 1; TC <= TCS; ++TC)
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{
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// cout<<"Case "<<TC<<": ";
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solve();
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}
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}
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