Simple Pascal's Triangle Program

import java.util.*;
class Pascal{
    public static void main(String args[]){
Scanner sc = new Scanner(System.in);
  int n = sc.nextInt();
for(int i=0;i<n;i++)
{
for(int k=n; k>i; k--)
{
System.out.print(" ");
}
 int  r = 1;
for(int j=0;j<=i;j++)
{
 System.out.print(r+ " ");
  r = r * (i - j) / (j + 1);
}
System.out.println();
}
}
}
input : 5
output :
      1
    1 1
   1 2 1
  1 3 3 1
1 4 6 4 1

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