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void 三七二十一數()
{//緣由https://ask.csdn.net/questions/7566632?spm=1005.2025.3001.5141int n = 0, a = 0, b = 0, p = 1;std::cin >> n;while (n--){std::cin >> a >> b;while (a<=b){if (a % 3 == 2 && a % 7 == 1)std::cout << a << "\t", p = 0; else;++a;}}if (p)std::cout << "none";
}

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