A. Diverse Permutationtime limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output
Permutation p is an ordered set of integers p1, p2, …, pn,
consisting of n distinct positive integers not larger than n.
We’ll denote asn the length of permutation p1, p2, …, pn.
Your task is to find such permutation p of length n,
that the group of numbers |p1 - p2|, |p2 - p3|, …, |pn - 1 - pn| has
exactly k distinct elements.
Input
The single line of the input contains two space-separated positive integers n, k (1 ≤ k < n ≤ 105).
Output
Print n integers forming the permutation. If there are multiple answers, print any of them.
Sample test(s)input
3 2
output
1 3 2
input
3 1
output
1 2 3
input
5 2
output
1 3 2 4 5
Note
By |x| we denote the absolute value of number x.
1 10 2 9 3 8 |7 6 5 4 3 2
不同的。
。
。全为1的
#include<cstdio>
#include<cstring>
#include<cstdlib>
#include<algorithm>
#include<functional>
#include<iostream>
#include<cmath>
#include<cctype>
#include<ctime>
using namespace std;
#define For(i,n) for(int i=1;i<=n;i++)
#define Fork(i,k,n) for(int i=k;i<=n;i++)
#define Rep(i,n) for(int i=0;i<n;i++)
#define ForD(i,n) for(int i=n;i;i--)
#define RepD(i,n) for(int i=n;i>=0;i--)
#define Forp(x) for(int p=pre[x];p;p=next[p])
#define Forpiter(x) for(int &p=iter[x];p;p=next[p])
#define Lson (x<<1)
#define Rson ((x<<1)+1)
#define MEM(a) memset(a,0,sizeof(a));
#define MEMI(a) memset(a,127,sizeof(a));
#define MEMi(a) memset(a,128,sizeof(a));
#define INF (2139062143)
#define F (100000007)
#define MAXN (100000+10)
#define MAXK (100000+10)
long long mul(long long a,long long b){return (a*b)%F;}
long long add(long long a,long long b){return (a+b)%F;}
long long sub(long long a,long long b){return (a-b+(a-b)/F*F+F)%F;}
typedef long long ll;
int n,k;
int main()
{
//freopen("CF482A.in","r",stdin);
//freopen(".out","w",stdout);cin>>n>>k;k--;
int l=1,r=n,b=1;
while(l<=r)
{if (b) printf("%d",l++);
else printf("%d",r--);
if (k) b^=1,k--; if (l<=r) putchar(' ');
}
cout<<endl;
return 0;
}
