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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone {
  9.  
  10.     public static void main (String[] args) throws java.lang.Exception {
  11.  
  12.         // your code goes here
  13.         Scanner sc = new Scanner(System.in);
  14.         int n = sc.nextInt();
  15.         int even = 2;
  16.         int odd = 1;
  17.  
  18.         for(int i=0; i<n; i++) {
  19.             if(i%2 != 0) {
  20.                 for(int j=0; j<=i; j++){
  21.                     System.out.printf("%d ",even);
  22.                     even += 2;
  23.                 }
  24.             }
  25.             else {
  26.                 for(int j=0; j<=i; j++){
  27.                     System.out.printf("%d ",odd);
  28.                     odd += 2;
  29.                 }
  30.             }
  31.             System.out.printf("\n");
  32.         }
  33.  
  34. 	}
  35. }
Success #stdin #stdout 0.19s 56768KB
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stdin
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6
stdout
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1 
2 4 
3 5 7 
6 8 10 12 
9 11 13 15 17 
14 16 18 20 22 24
https://ideone.com/d6bLNi
language:
Java (HotSpot 12)
created:
1 day ago
visibility:
public

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