638. Shopping Offers
题目描述
In LeetCode Store, there are some kinds of items to sell. Each item has a price.
However, there are some special offers, and a special offer consists of one or more different kinds of items with a sale price.
You are given the each item’s price, a set of special offers, and the number we need to buy for each item. The job is to output the lowest price you have to pay for exactly certain items as given, where you could make optimal use of the special offers.
Each special offer is represented in the form of an array, the last number represents the price you need to pay for this special offer, other numbers represents how many specific items you could get if you buy this offer.
You could use any of special offers as many times as you want.
Example 1:
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Example 2:
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Note:
- There are at most 6 kinds of items, 100 special offers.
- For each item, you need to buy at most 6 of them.
You are not allowed to buy more items than you want, even if that would lower the overall price.
题目大意
给定一组商品价格 prices
,以及一些组合的优惠策略 special
(包含商品数目及其对应的价格), 以及要购买的商品数目 needs
,求在最优策略下,恰好购买 needs
所需的商品(不能超过),需要的最小金额。
解题思路
DFS,通过辅助字典,记录已经遍历过的数目组合。
代码
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