P2896 [USACO08FEB]一起吃饭Eating Together 题目描述 The cows are so very silly about their dinner partners. They have organized themselves into three groups (conveniently numbered 1, 2, and 3) that insist upon dining together. The trouble starts when they lin…

题目描述 The cows are so very silly about their dinner partners. They have organized themselves into three groups (conveniently numbered 1, 2, and 3) that insist upon dining together. The trouble starts when they line up at the barn to enter the feeding…

https://www.luogu.org/problem/show?pid=2896 题目描述 The cows are so very silly about their dinner partners. They have organized themselves into three groups (conveniently numbered 1, 2, and 3) that insist upon dining together. The trouble starts when th…

P2896 [USACO08FEB]一起吃饭Eating Together 显然的最长不升/降子序列,求出最长值,则答案为$n-$最长值(改掉剩下的). 复杂度$O(nlogn)$ (然鹅有神仙写了$O(n)$模拟) #include<iostream> #include<cstdio> #include<cstring> #include<cctype> #define re register using namespace std; void read(…

传送门 可以考虑DP 设 f [ i ] [ 1/2/3 ] [ 0/1 ] 表示当前考虑到第 i 头牛,打算让当前位置的编号变成 1/2/3,并且打算让整段序列上升/下降 0/1 然后就对每种情况慢慢考虑转移就行了 可以发现第一维可以直接优化掉,然后空间就是 O(1),时间就是 O(n) 太简单就不用注释了吧... #include<iostream> #include<cstdio> #include<algorithm> #include<cstring&g…

P2894 [USACO08FEB]酒店Hotel https://www.luogu.org/problem/show?pid=2894 题目描述 The cows are journeying north to Thunder Bay in Canada to gain cultural enrichment and enjoy a vacation on the sunny shores of Lake Superior. Bessie, ever the competent travel…

P2894 [USACO08FEB]酒店Hotel 题目描述 The cows are journeying north to Thunder Bay in Canada to gain cultural enrichment and enjoy a vacation on the sunny shores of Lake Superior. Bessie, ever the competent travel agent, has named the Bullmoose Hotel on fam…

P2894 [USACO08FEB]酒店Hotel 题目描述 The cows are journeying north to Thunder Bay in Canada to gain cultural enrichment and enjoy a vacation on the sunny shores of Lake Superior. Bessie, ever the competent travel agent, has named the Bullmoose Hotel on fam…

P2893 [USACO08FEB]修路Making the Grade 题目描述 A straight dirt road connects two fields on FJ's farm, but it changes elevation more than FJ would like. His cows do not mind climbing up or down a single slope, but they are not fond of an alternating succes…

P2895 [USACO08FEB]流星雨Meteor Shower 题目描述 Bessie hears that an extraordinary meteor shower is coming; reports say that these meteors will crash into earth and destroy anything they hit. Anxious for her safety, she vows to find her way to a safe locatio…