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#ifndef MISC_GCD_H
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#define MISC_GCD_H
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namespace Misc
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{
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// TODO: replace to the std::gcd() when the C++17 will be available.
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int gcd(int a, int b)
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{
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return b == 0 ? a : gcd(b, a % b);
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}
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}
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#endif
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