This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
void solve(){
int n;
cin >> n;
vector<int> A(n);
for(int i=0 ; i<n ; i++){
cin >> A[i];
}
int Xor = 0;
for(int i=0 ; i<n ; i++){
for(int j=i ; j<n ; j++){
Xor ^= (A[i] + A[j]);
}
}
cout << Xor;
}
signed main(){
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
solve();
return 0;
}
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