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Difficulty: Hard
Category: Number Theory & Algorithms
Practice quant interview questions from top firms including Jane Street, Citadel, Two Sigma, DE Shaw, and other leading quantitative finance companies.
Topics: math, factorials, number-theory, legendres-formula, interview-classic
You are working on a custom Big Integer arithmetic library for a crypto-currency exchange, specifically optimizing the storage of massive factorial numbers used in permutation calculations. A common compression technique involves stripping trailing zeros before storage. Without calculating the full value, determine the exact number of trailing zeros in $100!$ (100 factorial).
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