HBC223925[NOI2001]食物链,数据结构,并查集DFoodDisplayArrangement题解

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Yourfriend,Thomas,isworkingonFoodDisplayArrangements(FDA).Hehasallthefoodlined up on a long row (table). His job requires that he arranges the FDA in an aesthetically pleasing manner.AnFDA

Your friend, Thomas, is working on Food Display Arrangements (FDA). He has all the food lined up on a long row (table). His job requires that he arranges the FDA in an aesthetically pleasing manner. An FDA is aesthetically pleasing if all the food of the same type is grouped together, i.e., all the food of the same type are next to each other. Thomas can reorganize the FDA as follows: pick up all the food of one type and place it on either end of the table, i.e., place it at the beginning of the table or at the end of the table. Thomas wants to know the minimum number of reorganization steps needed to make the FDA aesthetically pleasing. Note that you don’t need to tell him the specific steps, only the least number of steps.   The Problem:   Given a display of food by their types, determine the minimum number of times necessary to move all food of the same type to the end or the beginning of the display to ensure that all food of the same type is grouped together. Assume that the display can be extended at the ends to contain any amount of moved food.

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标签： HBC223925[NOI2001]食物链 数据结构 并查集DFoodDisplayArrangement题解