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- #include <bits/stdc++.h>
- using namespace std;
- using ll = long long;
- void solve()
- {
- int n;
- cin>>n;
- int temp;
- ll Sum = 0;
- ll Xor = 0;
- for (int i = 0; i<n; i++)
- {
- cin>>temp;
- Sum+=temp;
- Xor^=temp;
- }
- cout<<2<<endl<<Xor<<' '<<Sum + Xor<<endl;
- }
- int main() {
- ios_base::sync_with_stdio(0);
- cin.tie(nullptr);
- int t;
- cin>>t;
- for (int i = 0; i<t; i++) solve();
- }
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