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template<typename Value, size_t N>
constexpr std::array<int, N> frequency_map(std::array<Value, N> const& values)
std::map<Value, int> freq_map;
for (int i = 0; i < N; ++i)
freq_map[values[i]] += 1; // Count each occurence using a std::map
std::array<int, N> freqs {}; // Reconstruct a std::array from our std::map
for (int i = 0; i < N; ++i)
freqs[i] = freq_map[values[i]];
return freqs;
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