12 lines
207 B
Plaintext
12 lines
207 B
Plaintext
#include <iostream>
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int main() {
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int a;
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std::cin >> a;
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double b = 1;
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double c = 0.0;
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for (int i = 1; i <= a; ++i) {
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c += b / i;
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b = -b;
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}
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std::cout << c << "\n";
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} |