算法训练 数的划分

import java.util.Scanner;
public class Main {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner sc=new Scanner(System.in);
        int i,j,n,k,a[][]=new int[201][7];
        a[1][1]=1;
        n=sc.nextInt();
        k=sc.nextInt();
        for(i=2;i<=n;i++)
            for(j=1;j<=k;j++)
                if(i>=j)
                    a[i][j]=a[i-j][j]+a[i-1][j-1];
        System.out.println(a[n][k]);

    }

}