Educational Codeforces Round 11B. Seating On Bus 模拟

地址：http://codeforces.com/contest/660/problem/B

题目：

B. Seating On Bus

time limit per test

1 second

memory limit per test

256 megabytes

input

standard input

output

standard output

Consider 2n rows of the seats in a bus. n rows of the seats on the left and n rows of the seats on the right. Each row can be filled by two people. So the total capacity of the bus is 4n.

Consider that m (m ≤ 4n) people occupy the seats in the bus. The passengers entering the bus are numbered from 1 to m (in the order of their entering the bus). The pattern of the seat occupation is as below:

1-st row left window seat, 1-st row right window seat, 2-nd row left window seat, 2-nd row right window seat, ... , n-th row left window seat,n-th row right window seat.

After occupying all the window seats (for m > 2n) the non-window seats are occupied:

1-st row left non-window seat, 1-st row right non-window seat, ... , n-th row left non-window seat, n-th row right non-window seat.

All the passengers go to a single final destination. In the final destination, the passengers get off in the given order.

1-st row left non-window seat, 1-st row left window seat, 1-st row right non-window seat, 1-st row right window seat, ... , n-th row left non-window seat, n-th row left window seat, n-th row right non-window seat, n-th row right window seat.

The seating for n = 9 and m = 36.

You are given the values n and m. Output m numbers from 1 to m, the order in which the passengers will get off the bus.

Input

The only line contains two integers, n and m (1 ≤ n ≤ 100, 1 ≤ m ≤ 4n) — the number of pairs of rows and the number of passengers.

Output

Print m distinct integers from 1 to m — the order in which the passengers will get off the bus.

Examples

input

2 7

output

5 1 6 2 7 3 4

input

9 36

output

19 1 20 2 21 3 22 4 23 5 24 6 25 7 26 8 27 9 28 10 29 11 30 12 31 13 32 14 33 15 34 16 35 17 36 18

 思路：直接模拟就好了，座位位置找规律就好了，别告诉我你找不到规律、、、、

#include <iostream>
#include <algorithm>
#include <cstdio>
#include <cmath>
#include <cstring>
#include <queue>
#include <stack>
#include <map>
#include <vector>

#define PI acos((double)-1)
#define E exp(double(1))
using namespace std;
int seat[110][5];
int main (void)
{
    int n,m;
    cin>>n>>m;
    memset(seat,0,sizeof(seat));
    for(int i=1;i<=m;i++)
        if(i<=2*n)
        {
            if(i%2 == 1)
                seat[(i+1)/2][2] = i;
            else
                seat[i/2][4] = i;
        }
        else
        {
            int t = i-2*n;
            if(t%2 == 1)
                seat[(t+1)/2][1]=i;
            else
                seat[t/2][3] = i;
        }
    for(int i=1,k=1;k<=m && i<=n;i++)
        for(int j = 1;j<=4;j++)
            if(seat[i][j])
            {
                if(k == m)
                    printf("%d\n",seat[i][j]);
                else
                    printf("%d ",seat[i][j]);
                k++;
            }

    return 0;
}