题目链接: http://codeforces.com/problemset/problem/645/B 题意: 给定步数和排列,每步可以交换两个数,问最后逆序数最多是多少对? 分析: 看例子就能看出来肯定是不断往中间逼近,然后交换头尾两个,给定交换的对数,直接算就好了,复杂度O(1) 代码: #include<iostream> using namespace std; typedef long long ll; int main (void) { ll n, m; cin>>n…

简单题. 第一次交换$1$和$n$,第二次交换$2$和$n-1$,第三次交换$3$和$n-2$.....计算一下就可以了. #pragma comment(linker, "/STACK:1024000000,1024000000") #include<cstdio> #include<cstring> #include<cmath> #include<algorithm> #include<vector> #include&…

It is a balmy spring afternoon, and Farmer John's n cows are ruminating about link-cut cacti in their stalls. The cows, labeled 1 through n, are arranged so that the i-th cow occupies the i-th stall from the left. However, Elsie, after realizing that…

题目链接: B. Mischievous Mess Makers time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output It is a balmy spring afternoon, and Farmer John's n cows are ruminating about link-cut cacti in their stalls…

B. Mischievous Mess Makers 题目连接: http://www.codeforces.com/contest/655/problem/B Description It is a balmy spring afternoon, and Farmer John's n cows are ruminating about link-cut cacti in their stalls. The cows, labeled 1 through n, are arranged so…

题目链接: C. Enduring Exodus time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output In an attempt to escape the Mischievous Mess Makers' antics, Farmer John has abandoned his farm and is traveling to…

Mischievous Mess Makers CodeForces - 645B It is a balmy spring afternoon, and Farmer John's n cows are ruminating about link-cut cacti in their stalls. The cows, labeled 1 through n, are arranged so that the i-th cow occupies the i-th stall from the…

C. Enduring Exodus 题目连接: http://www.codeforces.com/contest/655/problem/C Description In an attempt to escape the Mischievous Mess Makers' antics, Farmer John has abandoned his farm and is traveling to the other side of Bovinia. During the journey, he…

C. Enduring Exodus time limit per test2 seconds memory limit per test256 megabytes inputstandard input outputstandard output In an attempt to escape the Mischievous Mess Makers' antics, Farmer John has abandoned his farm and is traveling to the other…

In an attempt to make peace with the Mischievious Mess Makers, Bessie and Farmer John are planning to plant some flower gardens to complement the lush, grassy fields of Bovinia. As any good horticulturist knows, each garden they plant must have the e…