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13 lines
218 B
C++
13 lines
218 B
C++
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#include <bits/stdc++.h>
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using namespace std;
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int main() {
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unsigned long long x, ans = 0;
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for (int i = 0; i < 3000000; i++) {
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cin >> x;
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ans ^= x;
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}
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cout << ans << endl;
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return 0;
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}
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