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Use scan() for D16

This commit is contained in:
kageru 2019-12-16 15:07:49 +01:00
parent e69ad47143
commit 00200eda44
Signed by: kageru
GPG Key ID: 8282A2BEA4ADA3D2
1 changed files with 6 additions and 6 deletions
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12
2019/16/src/main.rs
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@ -43,14 +43,14 @@ fn part1(mut last_phase: Vec<i32>) -> String {
fn part2(input: Vec<i32>) -> String {
let offset: usize = input.iter().take(7).map(|n| n.to_string()).collect::<String>().parse().unwrap();
let mut p2 = input.repeat(10_000).split_off(offset);
p2.reverse();
for _ in 0..100 {
let mut s = 0;
for i in (0..p2.len()).rev() {
s += p2[i];
p2[i] = s % 10;
}
p2 = p2.iter().scan(0, |acc, n| {
*acc += n;
Some(*acc%10)
}).collect();
}
p2.iter().take(8).map(|n| n.to_string()).collect::<String>()
p2.iter().rev().take(8).map(|n| n.to_string()).collect::<String>()
}
fn main() {