Task 1 plperl done

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diff --git a/challenge-211/luca-ferrari/postgresql/ch-1.plperl b/challenge-211/luca-ferrari/postgresql/ch-1.plperl
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+--
+-- Perl Weekly Challenge 211
+-- Task 1
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-211/>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc211;
+
+/*
+testdb=> select pwc211.task1_plperl( array[ array[4,3,2,1], array[ 5,4,3,2], array[6,5,4,3] ] );
+ task1_plperl 
+--------------
+ t
+(1 row)
+
+*/
+CREATE OR REPLACE FUNCTION
+pwc211.task1_plperl( int[][] )
+RETURNS bool
+AS $CODE$
+   my ( $array ) = @_;
+
+   my $diag;
+   $diag->{ $array->[ $_ ]->[ $_ ] }++ for ( 0 .. scalar( $array->@* ) - 1 );
+   return 0 if ( keys( $diag->%* ) != 1 );
+   return 0 if ( $diag->{ $array->[ 0 ]->[ 0 ] } != scalar( $array->@* ) );
+   return 1;
+$CODE$
+LANGUAGE plperl;