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;
int main(){
int n;
cin>>n;
vector <int> a(n);
for(int i=0;i<n;i++){
cin>>a[i];
}
long long ans=0;
for(int i=0;i<n;i++){
for(int j=i;j<n;j++){
long long x=a[i]+a[j];
ans^=x;
}
}
cout<<ans;
}
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