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Re:完全背包问题 219ms过,还要优化一下,简单讲一下思路

Posted by cxh512713001 at 2010-12-29 14:01:27 on Problem 2063
In Reply To:完全背包问题 219ms过,还要优化一下,简单讲一下思路 Posted by:2008022118 at 2009-12-28 18:39:07
> DD大牛背包九讲中的完全背包O(VN)的解法
> for (i 1..N)
> for (j cost[i]..Capacity) //是顺序而非逆序
> dp[j] = max{dp[j],dp[j-cost[i]] + val[i]}
> 
> 总资金 为 背包容量,因为利息会成为本金,所以背包容量不断更新(加上一年的利息)。
> 
> 债券可以看作花费,interest可以看作价值...
> 
> 219ms的一个简单优化。
> 预处理 债券的值(因为是1000的倍数,所以 /1000,利息不变),花费除了1000,则容量自然除
> 1000.
> ...

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