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  1. #!/usr/bin/perl
  2. $m=<> and print join"\n",map{' 'x($m-$_).'*'x(2*$_+1)}(0..$m),"\n";
Success #stdin #stdout 0s 3564KB
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            *
           ***
          *****
         *******
        *********
       ***********
      *************
     ***************
    *****************
   *******************
  *********************
 ***********************
*************************
            *
https://ideone.com/Qmphxe
language:
Perl (perl 5.28.1)
created:
9 years ago
visibility:
public

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