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...
    undef (@h_item_selector);
...
    my $g_freeSelectorIndex = 10000000
    $#idsMap = $g_freeSelectorIndex;      ### pre-allocate to final si
+ze
...

 
for(my $i = 1; $i < 50; $i++) {    
    my $start = "aaa";
...
    }
    $h_item_selector[$i] = \%hash;     ### then assign a reference
}