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21 lines
252 B
C++
21 lines
252 B
C++
#include <iostream>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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int f(int x) {
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return x == 1 ? 1 : x * f(x - 1);
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}
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int n;
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int main() {
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std::ios::sync_with_stdio(false);
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cin >> n;
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cout << f(n) << endl;
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return 0;
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}
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