Java : hash tower

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {
    private final static Scanner scanner = new Scanner(System.in);
    public static void main(String[] args) {
         int num;
         num = scanner.nextInt();
        if ((num < 1) || (num >100))
            {
            System.exit(0);
        }
        for(int i=0;i<num;i++){
        
            for(int j=0;j<num-i-1;j++){
                     
                System.out.print(" ");  
            }
              for(int k=0;k<i+1;k++){
                     
                System.out.print("#");  
            }
            System.out.println("");
       
        }             
    }
}