intermediateDSA & Coding66 of 436
Find the number of trailing zeroes in the factorial of a given number (coding)
Tests whether you know trailing zeroes come from factors of 10, which are always bottlenecked by the scarcer factor of 5, so you count multiples of 5, 25, 125... in n! rather than naively computing the full factorial, which overflows for even moderately sized n.
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