What have you tried? What didn't work? Without seeing what you've tried, it's very hard to help you debug your approach. See How do I post a question effectively?

Rather than just using a hash, you want to use a hash of arrays, because you want to associate each key with multiple values. In this case, you might even want to use an Array of Arrays, since your keys are numeric. See HASHES OF ARRAYS in perldsc, and maybe perllol, perldata, perlreftut, and/or perlref for additional info.

#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

In reply to Re: print identical keys once along with their values by kennethk
in thread print identical keys once along with their values by bsherkhane

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