29 lines
412 B
C++
29 lines
412 B
C++
#include <iostream>
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int main()
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{
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using namespace std;
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size_t T;
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cin >> T;
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while (T--) {
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size_t N;
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cin >> N;
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int value, result;
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result = 0;
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for (size_t i = 0; i < N; ++i) {
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cin >> value;
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if (((i + 1) & 1) && ((N - i) & 1))
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result ^= value;
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}
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cout << (result^0) << endl;
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}
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return 0;
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}
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