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
|
fn main() {
let input = advent::read_numbers(1);
println!("1a: {}", count_increasing(&input));
println!("1b: {}", count_increasing_window(&input, 3));
}
fn count_increasing(numbers: &[usize]) -> usize {
count_increasing_window(numbers, 1)
}
fn count_increasing_window(numbers: &[usize], window_size: usize) -> usize {
numbers[window_size..].iter()
.zip(numbers.iter())
.map(|(&x,&y)| (x as isize) - (y as isize))
.filter(|&x| x.is_positive())
.count()
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test() {
let numbers = [199, 200, 208, 210, 200, 207, 240, 269, 260, 263];
assert_eq!(count_increasing(&numbers), 7);
assert_eq!(count_increasing_window(&numbers, 3), 5);
}
}
|
