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// @Title: 阶乘后的零 (Factorial Trailing Zeroes)
// @Author: 15816537946@163.com
// @Date: 2022-03-25 19:29:04
// @Runtime: 0 ms
// @Memory: 1.9 MB
func trailingZeroes(n int) int {
	var cnt int
	for n > 0 {
		cnt += n / 5
		n /= 5
	}

	return cnt
}