r*(1-r)/(1-0.81*r*r)
回複:回複:讓人煩惱的禮金卡問題
The optimal solution gets you 1000 * r, where r is the value such that 0 <= r <= 1 and the following expression get its max:
r*(1-r)/(1-0.81*r*r)
r*(1-r)/(1-0.81*r*r)
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• 回複:回複:回複:讓人煩惱的禮金卡問題 -justatry- ♂ (88 bytes) () 01/06/2009 postreply 21:45:31