题目大意是有n种等级的珍珠，如果要买某种珍珠就必须比预定购买数量多买10粒，低等级的珍珠可以用高等级的代替，给出要买的每种等级的珍珠的数量和单价，求要买够所有珍珠需要花费的最少价格。
用f[i]表示买前i种等级的珍珠需要花费的最少价格，则f[i]=min(f[i],f[j]+(sum[i]-sum[j]+10)*p[i])(0<=j<i);sum[i]为前i种等级的珍珠的预定购买量之和。
1651905 2008-09-30 00:04:51 Accepted 1563 FPC 0 112 IwfWcf
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