*****
*****
====================

1
22
333
4444
55555

if n=5
=======================
1
12
123
1234
12345
===========================
1
2 3
4 5 6
7 8 9 10
11 12 13 14 15 
========================
// Online Java Compiler
// Use this editor to write, compile and run your Java code online
import java.util.*;
class Main {
    public static void main(String[] args) {
        System.out.println("Try programiz.pro");
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        
        for(int i=1;i<=n;i++){
            for(int j=1;j<=i;j++){
                System.out.print(j);
            }
            System.out.println();
        }
    }
}
===================================================
5
120
===
4
24
==========================================
// Online Java Compiler
// Use this editor to write, compile and run your Java code online
import java.util.*;
class Main {
    public static void main(String[] args) {
        System.out.println("Try programiz.pro");
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int count=1;
        for(int i=1;i<=n;i++){
            for(int j=1;j<=i;j++){
                System.out.print(count+" ");
                count++;
            }
            System.out.println();
        }
    }
}
====================================================