forshumaff.java

/**
 * Created by andrew on 22.01.16.
 */
public class Main {
    public static void main(String []args){
        int n = 8;
        int k = 2;
        int r[][] = new int[k][n/k];
        int s = sum(n);
        if (s%k != 0 ) {
            System.out.println(0);
            return;
        }
        int jm = n/(2*k);
        int im =  k;
        int d = 1;

        for(int i = 0; i < im;i++){
            for (int j = 0; j <jm; j++){
                int min = d;
                int max =   n - d+1;
                d++;
                r[i][j] = min;
                r[i][n/k-j-1] = max;
            }
        }
        for(int i = 0; i <k;i++){
            for (int j = 0; j <n/k; j++){
                System.out.print(r[i][j]+" ");
            }
            System.out.println();
        }
    }

    private static int sum(int s){
        return (s+1)*s/2;
    }
}