{ "data": { "question": { "questionId": "172", "questionFrontendId": "172", "boundTopicId": null, "title": "Factorial Trailing Zeroes", "titleSlug": "factorial-trailing-zeroes", "content": "

Given an integer n, return the number of trailing zeroes in n!.

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Note that n! = n * (n - 1) * (n - 2) * ... * 3 * 2 * 1.

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Example 1:

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\nInput: n = 3\nOutput: 0\nExplanation: 3! = 6, no trailing zero.\n
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Example 2:

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\nInput: n = 5\nOutput: 1\nExplanation: 5! = 120, one trailing zero.\n
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Example 3:

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\nInput: n = 0\nOutput: 0\n
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Constraints:

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Follow up: Could you write a solution that works in logarithmic time complexity?

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