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#pragma once
#include <array>
#include <unordered_map>
namespace std {
template <typename T, size_t N> struct hash<array<T, N>> {
typedef array<T, N> argument_type;
typedef size_t result_type;
result_type operator()(const argument_type& a) const {
hash<T> hasher;
result_type h = 0;
for (result_type i = 0; i < N; ++i) {
h = h * 31 + hasher(a[i]);
}
return h;
}
};
} // namespace std
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