20240731 Finished

src/problem/mod.rs

@@ -189,4 +189,5 @@ mod p191_number_of_1_bits;
 mod p136_single_number;
 mod p137_single_number_ii;
 mod p201_bitwise_and_of_numbers_range;
-mod p66_plus_one;
+mod p66_plus_one;
+mod p172_factorial_trailing_zeroes;

src/problem/p172_factorial_trailing_zeroes.rs

@@ -0,0 +1,32 @@
+/**
+ * [172] Factorial Trailing Zeroes
+ */
+pub struct Solution {}
+
+
+// submission codes start here
+
+impl Solution {
+    pub fn trailing_zeroes(n: i32) -> i32 {
+        let mut n = n;
+        let mut result = 0;
+
+        while n > 0 {
+            n /= 5;
+            result += n;
+        }
+        
+        result
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_172() {
+    }
+}