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| #include <iostream>
#include <type_traits>
constexpr unsigned int eulerFunction(unsigned int n)
{
unsigned int ans = n;
for (unsigned int i = 2; i * i <= n; i++)
if (n % i == 0)
{
ans = ans / i * (i - 1);
while (n % i == 0)
n /= i;
}
if (n > 1)
ans = ans / n * (n - 1);
return ans;
}
template <unsigned int... pack>
struct function2List
{
constexpr static unsigned int length = sizeof...(pack);
constexpr static unsigned int value[sizeof...(pack)] = {eulerFunction(pack)...};
};
constexpr unsigned int log2_func(unsigned int x)
{
int ans = 0;
while (x >>= 1)
++ans;
return ans;
}
template <unsigned int N, typename T, unsigned int temp, unsigned int MAX, unsigned int... pack>
struct generatorList : generatorList<N, void, temp - 1, 2 * MAX, pack..., (pack + MAX)...> {};
template <unsigned int N, unsigned int temp, unsigned int MAX, unsigned int... pack>
struct generatorList<N, std::enable_if_t<(N >> (temp - 1)) % 2, void>, temp, MAX, pack...> : generatorList<N, void, temp - 1, 2 * MAX + 1, 1, (pack + 1)..., (pack + MAX + 1)...> {};
template <unsigned int N, unsigned int... pack>
struct generatorList<N, void, 0, N, pack...> : function2List<pack...> {};
template <unsigned int N>
struct EulerFunctionList : generatorList<N, void, log2_func(N) + 1, 0> {};
int main()
{
constexpr unsigned int N = 50000;
for (auto i = 0; i < EulerFunctionList<N>::length; i++)
{
std::cout << EulerFunctionList<N>::value[i] << " ";
}
return 0;
}
|