typedef std::array<double, 12> arrd;
typedef std::array<int, 12> arri;
typedef std::array<std::string, 12> arrst;
arrd gallons; // gallons 是 std::array<double, 12> 类型
arri days; // days 是 std::array<int, 12> 类型
arrst months; // months 是 std::array<std::string, 12> 类型
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