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;
using ll = long long;
int main(){
ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
int n; cin >> n;
vector<int> a(n+1);
for(int i=1;i<=n;++i) {
cin >> a[i];
}
int xorr=0;
for(int i=1;i<=n;++i) {
for(int j=i;j<=n;++j) {
xorr^=(a[i]+a[j]);
}
}
cout << xorr;
return 0;
}
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