public class HelloWorld { public static void main(String []args) { for(int i=4; i>0; i--)//n=4 { for(int j=0; j<=i; j++) { if(j<i) { System.out.print("_ "); } else { System.out.print(""+i); } } if(i<4) { for(int l=i; l<7-i; l++) //7-i=>(2n-1)-i { System.out.print(" _"); } System.out.print(" "+i); } for(int k=i; k>0; k--) { System.out.print(" _"); } System.out.print("\n"); if(i==1) { for(int a=i+1; a<=4; a++)//a=2 { for(int b=0; b<=a; b++) { if(b<a) { System.out.print("_ "); } else { System.out.print(""+a); } } System.out.print("\n"); } } } } }
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