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竟然让一个普通的多重背包用了18xx秒很顺利地过了

Posted by fanhqme at 2009-06-08 18:58:29 on Problem 1742
设dp[i][j]为用前i种钱币,最少使用多少个第i种钱币的情况下可以凑出j个单位的钱。

加上一个滚动数组

if (dp[j]!=-1)dp[j]=0;
else if (j>=A[i] && dp[j-A[i]]!=-1 && dp[j-A[i]]<C[i])dp[j]=dp[j-A[i]]+1;
else dp[j]=-1;


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