1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn fixed_tests() {
assert_eq!(zeros(0), 0);
assert_eq!(zeros(6), 1);
assert_eq!(zeros(14), 2);
assert_eq!(zeros(30), 7);
assert_eq!(zeros(1000), 249);
assert_eq!(zeros(100000), 24999);
assert_eq!(zeros(1000000000), 249999998);
}
fn solution(n: u64) -> u64 {
let mut r = 0;
let mut n = n / 5;
while n > 0 {
r += n;
n /= 5;
}
r
}
use rand::Rng;
#[test]
fn random_tests() {
let mut rng = rand::thread_rng();
for _i in 0..100 {
let n: u64 = rng.gen_range(0..1001);
let expected = solution(n);
let actual = zeros(n);
assert_eq!(actual, expected, "zeros({}): expected {}, got {}", n, expected, actual);
}
for _i in 0..100 {
let n: u64 = rng.gen_range(0..1000001);
let expected = solution(n);
let actual = zeros(n);
assert_eq!(actual, expected, "zeros({}): expected {}, got {}", n, expected, actual);
}
for _i in 0..100 {
let n: u64 = rng.gen_range(0..1000000001);
let expected = solution(n);
let actual = zeros(n);
assert_eq!(actual, expected, "zeros({}): expected {}, got {}", n, expected, actual);
}
}
}
|