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pub fn three_combination_iter(
limits: [usize; 3],
start: [usize; 3],
) -> impl Iterator<Item = [usize; 3]> {
(start[0]..limits[0]).flat_map(move |first| {
(start[1]..limits[1])
.flat_map(move |second| (start[2]..limits[2]).map(move |third| [first, second, third]))
})
}
pub fn two_combination_iter(
limits: [usize; 2],
start: [usize; 2],
) -> impl Iterator<Item = [usize; 2]> {
(start[0]..limits[0])
.flat_map(move |first| (start[1]..limits[1]).map(move |second| [first, second]))
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn three_combo() {
let it = three_combination_iter([2, 4, 6], [0, 2, 4]);
assert_eq!(
it.collect::<Vec<_>>(),
vec![
[0, 2, 4],
[0, 2, 5],
[0, 3, 4],
[0, 3, 5],
[1, 2, 4],
[1, 2, 5],
[1, 3, 4],
[1, 3, 5],
]
);
}
#[test]
fn latin_square_test_1() {
let it = three_combination_iter([2, 2, 2 + 1], [0, 0, 1]);
assert_eq!(
it.collect::<Vec<_>>(),
vec![
[0, 0, 1],
[0, 0, 2],
[0, 1, 1],
[0, 1, 2],
[1, 0, 1],
[1, 0, 2],
[1, 1, 1],
[1, 1, 2],
]
);
}
#[test]
fn latin_square_test_3() {
let it = three_combination_iter([4, 4, 5], [0, 0, 1]);
assert_eq!(
it.collect::<Vec<_>>(),
vec![
[0, 0, 1],
[0, 0, 2],
[0, 0, 3],
[0, 0, 4],
[0, 1, 1],
[0, 1, 2],
[0, 1, 3],
[0, 1, 4],
[0, 2, 1],
[0, 2, 2],
[0, 2, 3],
[0, 2, 4],
[0, 3, 1],
[0, 3, 2],
[0, 3, 3],
[0, 3, 4],
[1, 0, 1],
[1, 0, 2],
[1, 0, 3],
[1, 0, 4],
[1, 1, 1],
[1, 1, 2],
[1, 1, 3],
[1, 1, 4],
[1, 2, 1],
[1, 2, 2],
[1, 2, 3],
[1, 2, 4],
[1, 3, 1],
[1, 3, 2],
[1, 3, 3],
[1, 3, 4],
[2, 0, 1],
[2, 0, 2],
[2, 0, 3],
[2, 0, 4],
[2, 1, 1],
[2, 1, 2],
[2, 1, 3],
[2, 1, 4],
[2, 2, 1],
[2, 2, 2],
[2, 2, 3],
[2, 2, 4],
[2, 3, 1],
[2, 3, 2],
[2, 3, 3],
[2, 3, 4],
[3, 0, 1],
[3, 0, 2],
[3, 0, 3],
[3, 0, 4],
[3, 1, 1],
[3, 1, 2],
[3, 1, 3],
[3, 1, 4],
[3, 2, 1],
[3, 2, 2],
[3, 2, 3],
[3, 2, 4],
[3, 3, 1],
[3, 3, 2],
[3, 3, 3],
[3, 3, 4]
]
);
}
}