Russ Cox • 3/14/2008

Using Uninitialized Memory for Fun and Profit

This technical article details a classic programming trick for optimizing sparse set data structures. It explains how to leave array values uninitialized and read them safely, enabling operations like clearing or iterating over a set to change from O(m) to constant time. The post traces the technique from exercises in Aho, Hopcroft, and Ullman's algorithms book to its detailed analysis in a 1993 paper on sparse set representation.

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#performance optimization #algorithms #memory management