Microsoft’s implementation of unordered_map in Visual Studio 10 has performance issues so severe it may be unusable in your projects.

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In this updated look at LZW, I will first give a description of how LZW works, then describe the core C++ code that I use to implement the algorithm. I’ll then walk you through the use of the algorithm with a few varieties of I/O. Finally, I’ll show you some benchmarks and go over the history of this well-known compression algorithm.

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