float r_sequence(int x, int y)
// 边界处理：0辆车返回0，1辆车返回1（无需后续计算），更多细节参见快连下载-Letsvpn下载
arstechnica.com，详情可参考heLLoword翻译官方下载
Photograph: Julian Chokkattu
Singh’s New Yorker article ends by asking what these sorts of searches for common origins tell us: “that our wild, warring species shares something irreducible at its core.”