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;
typedef long long ll;
void solve() {
int N, A, B;
cin >> N >> A >> B;
int ansXOR= 0;
for (int i = 0; i < N; ++i) {
int tmp;
cin >> tmp;
ansXOR ^= tmp;
}
cout << ansXOR << endl;
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
solve();
}
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