Patten Printing

Construct a paztriangle up to the given N number. If the triangle is not formed then Print remaining elements  with X.

N=23

X
X  X
18  20  22
10  12  14 16
0  2  4  6  8

N=18

18
14 16
8 10 12
0 2 4 6

//Java Code

import java.util.Scanner;

public class Main {
    static void triangle(int n){
        int total=0;int _x=0;int count=0;
        for(int i=1;i<n;i++){
            total+=i;
            if((2*total)>n)
                break;
        }
        String []a= new String[total];
        if(n%2!=0)
            n-=1;
        for(int i=0;i<total;i++){
            if(count<=n) {
                a[i] = count+ "";
                count+=2;
            }
            else                a[i] = "X";
        }
        int right=1;
        while(total!=0){
            _x+=right;
            count=a.length-_x;
            for(int i=1;i<=right;i++){
                System.out.print(a[count++]+" ");
            }
            System.out.println();
            total-=right;
            right++;
        }
    }
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        triangle(sc.nextInt());
    }
}