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importantSYS.SOURCE: Dev Blogs• 2026-09-10T09:04:14Z

Algorithm Analysis: Random Picture Selection in Windows XP

#algorithm#windows-xp#reservoir-sampling

The article explains that Windows XP used a one-pass reservoir sampling algorithm with k=1 to select an initial user picture, employing RtlRandomEx with GetTickCount() as the seed. This method efficiently reduces file system calls and includes a safety check to limit sampling to 100 pictures.

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