return (float)rand() / RAND_MAX;
但真正的问题是，理想模型往往建立在需求高峰与利用率饱和的假设之上。而真实世界中的利用率，从来不会长期维持在高位。
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We did of course have a countdown first, because people love countdowns, because cricket is basically one unceasing countdown, an endless pencil stub ticking off names and numbers. There were 99 members of the supporting cast to be ushered to their spots, the non-Shanes of history, meat in the Ashes room.，这一点在heLLoword翻译官方下载中也有详细论述
It then uses the standard Dijkstra algorithm on the detailed local map within your start cluster to find the best paths from your actual start location to all border points of that starting cluster.