题目大意是一个线段分成n段涂色,有m种颜色可用,给出每种颜色的费用,每一段规定了所用的颜色以及涂色长度区间。同种颜色的涂色长度不能相同,求是否能按要求完成涂色以及最少需要花费的费用。
很典型的搜索题,主要用到了2个减枝技巧:
- 预处理出搜索到第i段时,第i+1段到第n段的涂色区间长度范围,如果剩余长度不在此范围内则可减枝。
- 预处理出搜索带第i段时,要用第i+1段到第n段规定的颜色完成剩余长度的涂色所需的最小费用。如果最小费用与当前费用之和大于或等于当前最优费用则可减枝。
其中第二个预处理通过O(nl^2)的DP完成。
2353428 2010-11-19 02:08:21 Accepted 2633 C++ 1320 212 IwfWcf
chenlina20160429
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