hi,
i need help in coding the LZ77 & LZ78 techniques in data compression.
if anyone can help me PLZ tell me cause i'm facing some problems
thxxxxxxxxxxx

Best thing to do is look in Google for "lz77 algorithm" LZ78 has patents on it so you want to be very careful with what you do with that.

Any good data compression book has loads of info on the subject.

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