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import java.util.Scanner;
public class test1 {
public static void main(String[] args) {
String c = " ";
int floor;
System.out.print("please input a num:");
Scanner IC = new Scanner (System.in);
floor = IC.nextInt();
// System.out.
System.out.println(floor);
for(int i=floor-1; i>=0; i--){
for(int j=0;j<i;j++){
System.out.print(c);
}
for(int k=1;k+i<=floor;k++){
System.out.print(k);
}
for(int m=floor;m-i>1;m--){
System.out.print(m-i-1);
}
System.out.println();
}
}
}
public class Test {
public static void main(String[] args) {
String c = " ";
int floor = 5; //需要几层就将floor设成几;
System.out.println(floor);
for(int i=floor-1; i>=0; i--){
for(int j=0;j<i;j++){
System.out.print(c);
}
for(int k=1;k+i<=floor;k++){
System.out.print(k);
}
for(int m=floor;m-i>1;m--){
System.out.print(m-i-1);
}
System.out.println();
}
}
}