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
use crate::divmod::divmod;
pub fn decimal_to_base_k(
k: i64,
mut n: i64,
) -> Vec<i64> {
assert!(k.abs() >= 2);
let mut nums = vec![];
loop {
let (q, mut r) = divmod(n, k);
n = q;
if r < 0 {
r -= k;
n += 1;
}
nums.push(r);
if n == 0 {
return nums;
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test() {
let cases = vec![
((2, 6), vec![0, 1, 1]),
((2, 10), vec![0, 1, 0, 1]),
((-2, 10), vec![0, 1, 1, 1, 1]),
];
for ((k, n), ans) in cases {
assert_eq!(decimal_to_base_k(k, n), ans);
}
}
}