@gene_score = (
         [ "gene_name_0", "score_0" ],
         [ "gene_name_1", "score_1" ],
            ...
         [ "gene_name_400", "score_400" ]
);

##</code><code>##

@gene_start_stop_chr = (
         [ "gene_name_0", "start_0", "stop_0", "chr_0" ],
         [ "gene_name_1", "start_1", "stop_1", "chr_1" ],
            ...
          [ "gene_name_30000", "start_30000", "stop_30000", "chr_30000" ]
);

##</code><code>##

@results = (
         [ "gene_name_0", "score_0", "start_0", "stop_0", "chr_0" ],
         [ "gene_name_1", "score_1", "start_1", "stop_1", "chr_1" ],
            ...
         [ "gene_name_400", "score_400", "start_400", "stop_400", "chr_400" ],
);

##</code><code>##

for (my $a = 0; $a < scalar @gene_score; $a++) {
        for (my $b = 0; $b < scalar @gssc; $b++) {
                if ("$gene_score[$a][0]" eq "$gssc[$b][0]") {
                print "$gene-score[$a][0]\t$gene_score[$a][1]\t$gssc[$b][1]\t$gssc[$b][2]\t$gssc[$b][3]\n";

                }
        }
}