import java.util.Scanner;
公共类珠母树{
计算//m阶乘
publicstaticintfun(intm ) {
int sum=0;
是if(m0 )
elseif(m==1||m==0) ) ) ) )
返回1;
else
sum=m*fun(m-1 );
返回和;
}
publicstaticvoidmain (字符串还是单身钢笔args ) )。
//todo自动- generated method stub
sannerin=newscanner(system.in;
int a、b、c、d;
a=in.nextInt (;
b=in.nextInt (;
c=fun(a )/(fun ) b ) fun (a-b );
d=fun(a )fun(B-1) fun(B-1 ) ) c;
}
}