最近在研究彩票，为什么人们那么在乎历史数据呢，虽然说简单的rand之类的函数不是很随机，但是彩票摇奖是像摇元宵那样从桶里摇出来的。
言归正传，买彩票还没中过什么奖呢。
刚才搜索了一下，原来是有一定的算法的，至于算法的理论基础，我就不知道了，也许是数学能证明的吧。
这里是一个类似glibc的实现的算法：
http://www.mscs.dal.ca/~selinger/random/
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