传送门 线段树优化dpdpdp入门题. 要求把nnn个数分成kkk段,每段价值为里面不相同的数的个数,求所有段的价值之和最大值.n≤35000,k≤50n\le35000,k\le50n≤35000,k≤50 先考虑直接暴力dpdpdp,fj,if_{j,i}fj,i​表示把前iii个分成jjj组的最优值. 显然fj,i=max⁡j−1≤k≤i−1{fj−1,k+W(k+1,i)}f_{j,i}=\max\limits_{j-1\le k\le i-1}\{f_{j-1,k}+W(k+1,i)\…

题面传送门 题目大意:将一个长度为n的序列分为k段,使得总价值最大,一段区间的价值表示为区间内不同数字的个数 思路: 显然的dp. 先想到一个朴素的状态转移方程 $dp[i][k]=max(dp[j][k-1]+val[j+1][i])$,$0<=j<i$ $dp[i][k]$表示到第i为,截取了k段的最大价值,val表示某一段区间的价值. 这样的时间复杂度是$n*n*k$,显然是不能接受的,这里面的一个n和一个k显然是不能优化的,那我们只需要把一个n优化成logn或者线性的就可以接受了,所以…

赛前任务 tags:任务清单 前言 现在xzy太弱了,而且他最近越来越弱了,天天被爆踩,天天被爆踩 题单不会在作业部落发布,所以可(yi)能(ding)会不及时更新 省选前的练习莫名其妙地成为了Noip前的杂题训练,我也很无奈啊 做完了的扔最后,欢迎好题推荐 这么多题肯定是完不成了,能多做一道是一道吧 DP yyb真是强得不要不要的辣:http://www.cnblogs.com/cjyyb/category/1036536.html [ ] [SDOI2010]地精部落 https://www…

B. Bakery time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Masha wants to open her own bakery and bake muffins in one of the n cities numbered from 1 to n. There are m bidirectional roads,…

Bakery 题目链接: http://codeforces.com/contest/707/problem/B Description Masha wants to open her own bakery and bake muffins in one of the n cities numbered from 1 to n. There are m bidirectional roads, each of whose connects some pair of cities. To bake…

面包店烹制面包及蛋糕,由n个销售员卖出.当有顾客进店购买面包或蛋糕时,应先在取号机上取号,然后等待叫号,若有销售员空闲时便叫下一号,试用信号量和PV操作写出Bakery算法的同步程序. 设计要求 1)为每个销售员/顾客产生一个进程/线程,设计正确的同步算法: 2)每个顾客进入面包店后,即时显示"Entered",还同时显示共有几名顾客: 3)至少有个顾客: 4)多个销售员/顾客程序须共享操作函数代码. 专业程序代写c++程序代写…

D. The Bakery time limit per test:2.5 seconds memory limit per test:256 megabytes input:standard input output:standard output Some time ago Slastyona the Sweetmaid decided to open her own bakery! She bought required ingredients and a wonder-oven whic…

Some time ago Slastyona the Sweetmaid decided to open her own bakery! She bought required ingredients and a wonder-oven which can bake several types of cakes, and opened the bakery. Soon the expenses started to overcome the income, so Slastyona decid…

B. The Bakery time limit per test 2.5 seconds memory limit per test 256 megabytes input standard input output standard output Some time ago Slastyona the Sweetmaid decided to open her own bakery! She bought required ingredients and a wonder-oven whic…

B. Bakery 题目连接: http://www.codeforces.com/contest/707/problem/B Description Masha wants to open her own bakery and bake muffins in one of the n cities numbered from 1 to n. There are m bidirectional roads, each of whose connects some pair of cities.…