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//语法高亮测试：cpp
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#include <iostream>
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using ull = unsigned long long;
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using std::cin, std::cout, std::flush;
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int main() {
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    cout << "Hello World!\n" << flush;
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    return 0;
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}

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#语法高亮测试：python
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import pandas as pd
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i = []
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for i in range(1, 5):
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    assert i > 0