/
iterative.rs
38 lines (31 loc) · 1.01 KB
/
iterative.rs
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
pub struct Solution;
// ------------------------------------------------------ snip ------------------------------------------------------ //
impl Solution {
pub fn check_perfect_number(num: i32) -> bool {
let num = num as u32;
let last = f64::from(num).sqrt() as u32;
let divisor_sum = 1 + (2..last).filter(|&x| num % x == 0).map(|x| x + num / x).sum::<u32>();
if num % last == 0 {
if last * last == num {
num == divisor_sum + last
} else {
num == divisor_sum + last + num / last
}
} else {
num == divisor_sum
}
}
}
// ------------------------------------------------------ snip ------------------------------------------------------ //
impl super::Solution for Solution {
fn check_perfect_number(num: i32) -> bool {
Self::check_perfect_number(num)
}
}
#[cfg(test)]
mod tests {
#[test]
fn test_solution() {
super::super::tests::run::<super::Solution>();
}
}