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use itertools::Itertools;
fn main() {
let input = advent::read_numbers(17);
println!("17a: {}", container_fittings(&input, 150));
println!("17b: {}", minimum_containers(&input, 150));
}
fn container_fittings(input: &[u16], target: u16) -> usize {
input.iter()
.powerset()
.filter(|containers| containers.iter().copied().sum::<u16>() == target)
.count()
}
fn minimum_containers(input: &[u16], target: u16) -> usize {
let min_count = input.iter()
.powerset()
.filter(|containers| containers.iter().copied().sum::<u16>() == target)
.map(|containers| containers.len())
.min()
.unwrap();
input.iter()
.powerset()
.filter(|containers| containers.len() == min_count)
.filter(|containers| containers.iter().copied().sum::<u16>() == target)
.count()
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test() {
let input = [20, 15, 10, 5, 5];
assert_eq!(container_fittings(&input, 25), 4);
assert_eq!(minimum_containers(&input, 25), 3);
}
}
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