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/// divisors[0] := []
pub fn divisors_table(size: usize) -> Vec<Vec<usize>> {
let mut divisors = vec![vec![]; size];
for i in 1..size {
for j in (i..size).step_by(i) {
divisors[j].push(i);
}
}
divisors
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test() {
let divs = divisors_table(10);
assert_eq!(
divs,
[
vec![],
vec![1,],
vec![1, 2,],
vec![1, 3,],
vec![1, 2, 4,],
vec![1, 5,],
vec![1, 2, 3, 6,],
vec![1, 7,],
vec![1, 2, 4, 8,],
vec![1, 3, 9,],
]
);
}
}