P2952 [USACO09OPEN]牛线Cow Line 题目描述 Farmer John's N cows (conveniently numbered 1..N) are forming a line. The line begins with no cows and then, as time progresses, one by one, the cows join the line on the left or right side. Every once in a while, s…

P3014 [USACO11FEB]牛线Cow Line 题目背景 征求翻译.如果你能提供翻译或者题意简述,请直接发讨论,感谢你的贡献. 题目描述 The N (1 <= N <= 20) cows conveniently numbered 1...N are playing yet another one of their crazy games with Farmer John. The cows will arrange themselves in a line and ask Far…

如果在阅读本文之前对于康托展开没有了解的同学请戳一下这里:  简陋的博客    百度百科 题目描述 N(1<=N<=20)头牛,编号为1...N,正在与FJ玩一个疯狂的游戏.奶牛会排成一行(牛线),问FJ此时的行号是多少.之后,FJ会给牛一个行号,牛必须按照新行号排列成线. 行号是通过以字典序对行的所有排列进行编号来分配的.比如说:FJ有5头牛,让他们排为行号3,排列顺序为: 1:1 2 3 4 5 2:1 2 3 5 4 3:1 2 4 3 5 因此,牛将在牛线1 2 4 3 5中. 之后,…

题目链接:https://www.luogu.org/problemnew/show/P2952 分析: 这道题非常适合练习deque双端队列,~~既然是是练习的板子题了,建议大家还是练练deque,下面来简单讲解一下deque的一些操作. clear()clear()clear():清空队列 pushpushpush_back()back()back():从尾部插入一个元素. pushpushpush_front()front()front():从头部插入一个元素. deque双端队列的先进就…

洛谷 2953 [USACO09OPEN]牛的数字游戏Cow Digit Game 题目描述 Bessie is playing a number game against Farmer John, and she wants you to help her achieve victory. Game i starts with an integer N_i (1 <= N_i <= 1,000,000). Bessie goes first, and then the two players…

康托展开 康托展开为全排列到一个自然数的映射, 空间压缩效率很高. 简单来说, 康托展开就是一个全排列在所有此序列全排列字典序中的第 \(k\) 大, 这个 \(k\) 即是次全排列的康托展开. 康托展开是这样计算的: 对于每一位, 累计除了前面部分, 字典序小于本位的排列总数, 即 LL cantor(){ LL ans = 0; for(LL i = 1;i <= num;i++){ LL cnt = 0; for(LL j = i + 1;j <= num;j++){ if(ask[j]…

P3045 [USACO12FEB]牛券Cow Coupons 71通过 248提交 题目提供者洛谷OnlineJudge 标签USACO2012云端 难度提高+/省选- 时空限制1s / 128MB 提交  讨论  题解 最新讨论更多讨论 86分求救 题目描述 Farmer John needs new cows! There are N cows for sale (1 <= N <= 50,000), and FJ has to spend no more than his budget…

P2950 [USACO09OPEN]牛绣Bovine Embroidery 题目描述 Bessie has taken up the detailed art of bovine embroidery. Cows embroider a cloth mounted in a circular hoop of integer radius d (1 <= d <= 50,000). They sew N (2 <= N <= 50,000) threads, each in a s…

P3111 [USACO14DEC]牛慢跑Cow Jog_Sliver 题目描述 The cows are out exercising their hooves again! There are N cows jogging on an infinitely-long single-lane track (1 <= N <= 100,000). Each cow starts at a distinct position on the track, and some cows jog at…

题目描述 Bessie has taken heed of the evils of sloth and has decided to get fit by jogging from the barn to the pond several times a week. She doesn't want to work too hard, of course, so she only plans to jog downhill to the pond and then amble back to…