这是我今天遇到最奇怪的问题,希望有人帮我解释一下... 一开始我能得90分: #include<iostream> #include<cstdio> #include<cmath> #include<ctime> #include<queue> #include<algorithm> #include<stack> #include<cstring> using namespace std; #define d…

Description Recently, the cows have been competing with strings of balanced  parentheses and comparing them with each other to see who has the  best one.  Such strings are scored as follows (all strings are balanced): the  string "()" has score…

3300: [USACO2011 Feb]Best Parenthesis Time Limit: 10 Sec  Memory Limit: 128 MBSubmit: 89  Solved: 42[Submit][Status] Description Recently, the cows have been competing with strings of balanced parentheses and comparing them with each other to see who…

http://www.lydsy.com/JudgeOnline/problem.php?id=3300 这个细节太多QAQ 只要将所有的括号'('匹配到下一个')'然后dfs即可 简单吧,,, #include <cstdio> #include <cstring> #include <cmath> #include <string> #include <iostream> #include <algorithm> #include…

Time Limit: 10 Sec Memory Limit: 128 MB Description Recently, the cows have been competing with strings of balanced parentheses and comparing them with each other to see who has the best one. Such strings are scored as follows (all strings are balanc…

3301: [USACO2011 Feb] Cow Line Time Limit: 10 Sec  Memory Limit: 128 MBSubmit: 82  Solved: 49[Submit][Status][Discuss] Description The N (1 <= N <= 20) cows conveniently numbered 1...N are playing yet another one of their crazy games with Farmer Joh…

康托展开 裸的康托展开&逆康托展开 康托展开就是一种特殊的hash,且是可逆的…… 康托展开计算的是有多少种排列的字典序比这个小,所以编号应该+1:逆运算同理(-1). 序列->序号:(康托展开) 对于每个数a[i],数比它小的数有多少个在它之前没出现,记为b[i],$ans=1+\sum b[i]* (n-i)!$ 序号->序列:(逆康托展开) 求第x个排列所对应的序列,先将x-1,然后对于a[i],$\left\lfloor \frac{x}{(n-i)!} \right\rflo…

2274: [Usaco2011 Feb]Generic Cow Protests Time Limit: 10 Sec  Memory Limit: 128 MBSubmit: 196  Solved: 122[Submit][Status] Description Farmer John's N (1 <= N <= 100,000) cows are lined up in a row and numbered 1..N. The cows are conducting another…

3301: [USACO2011 Feb] Cow Line Time Limit: 10 Sec  Memory Limit: 128 MBSubmit: 67  Solved: 39[Submit][Status] Description The N (1 <= N <= 20) cows conveniently numbered 1...N are playing yet another one of their crazy games with Farmer John. The co…

2272: [Usaco2011 Feb]Cowlphabet 奶牛文字 Time Limit: 10 Sec  Memory Limit: 128 MBSubmit: 138  Solved: 97[Submit][Status][Discuss] Description Like all bovines, Farmer John's cows speak the peculiar 'Cow'language. Like so many languages, each word in this…