题目链接:http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=4255 题目大意:在x轴上有n个客人,每个客人每分钟增加的愤怒值不同.给出客人和餐厅的位置,以及客人每分钟增加的愤怒值,和送餐行走一公里需要的时间,问送完n个客人的外卖最小愤怒值.解题思路:如果要访问完[i,j],那么它的子区间一定访问完了.用dp[i][j][0]表示访问完区间[i,j]并留在左端点,dp[i][j][1]表示访问完区间[i,j]并留在右端点.把饭店…

这道题我不会,看了网上的题解才会的,涨了姿势,现阶段还是感觉区间DP比较难,主要是太弱...QAQ 思路中其实有贪心的意思,n个住户加一个商店,分布在一维直线上,应该是从商店开始,先向两边距离近的送,再往远的送. 这样肯定省时间,因为去了远的地方,近的地方自然就送了,不可能回来再送,所以我们可以开始定义状态 dp[i][j]代表送完从 i 到 j 所耗费的最小代价,但是我们发现此时状态虽然有了但是很难写出状态转移方程, 因为送完 i 到 j ,最后要么停在 i ,要么停在 j ,所以定义dp[i…

Time Limit: 2 Seconds      Memory Limit: 65536 KB When we are focusing on solving problems, we usually prefer to stay in front of computers rather than go out for lunch. At this time, we may call for food delivery. Suppose there are N people living i…

When we are focusing on solving problems, we usually prefer to stay in front of computers rather than go out for lunch. At this time, we may call for food delivery. Suppose there are N people living in a straight street that is just lies on an X-coor…

https://www.luogu.org/problemnew/show/P3146 一道区间dp的题,以区间长度为阶段; 但由于要处理相邻的问题,就变得有点麻烦; 最开始想了一个我知道有漏洞的方程 ][j]) f[i][j] = max(f[i][k],f[k + ][j]); ); 可能f[i][k] = f[i][j],但他们可合并的并未相邻; 可以这样 #include <bits/stdc++.h> #define read read() #define up(i,l,r) for…

We give the following inductive definition of a “regular brackets” sequence: the empty sequence is a regular brackets sequence, if s is a regular brackets sequence, then (s) and [s] are regular brackets sequences, and if a and b are regular brackets…

https://vjudge.net/problem/ZOJ-3469 题意:在一条直线上有一个餐厅和n个订餐的人,每个人都有随时间上升的不满意值,从餐厅出发,计算出送完时最小的不满意值总和. 思路:这道题和UVa 1632这道题目很像,只不过1632可以从任一点出发,而这题必须从餐厅出发.1632每个坐标几秒之后就会消失,这题是每分钟不满意值会上升,比较类似,都是挺不错的区间DP题. d[i][j][0]代表的是在送完i~j这个区间的最小不满意值,并且此时人处于左端,d[i][j][1]则是人…

Food Delivery Time Limit: 2 Seconds      Memory Limit: 65536 KB When we are focusing on solving problems, we usually prefer to stay in front of computers rather than go out for lunch. At this time, we may call for food delivery. Suppose there are N p…

题目链接:https://vjudge.net/problem/ZOJ-3469 Food Delivery Time Limit: 2 Seconds      Memory Limit: 65536 KB When we are focusing on solving problems, we usually prefer to stay in front of computers rather than go out for lunch. At this time, we may call…

标签: ACM 题目 Gappu has a very busy weekend ahead of him. Because, next weekend is Halloween, and he is planning to attend as many parties as he can. Since it's Halloween, these parties are all costume parties, Gappu always selects his costumes in such…