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#!/usr/bin/env perl
use strict;
...
                push @queue,("$`$&+$'","$`$&-$'");
        }
}

123-45-67+89
123+4-5+67-89
...
12-3-4+5-6+7+89
123-4-5-6-7+8-9
1+2+3-4+5+6+78+9

#!/usr/bin/env perl
use strict;
...
    }
}