Created
December 10, 2020 06:55
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use crate::common::Solution; | |
use crate::common::parsed_from_each_line; | |
#[derive(Debug)] | |
struct Data { | |
level: i64, | |
consecutive_ones: usize, | |
seqs: [usize;4], | |
} | |
impl Data { | |
fn new() -> Data { Data { level: 0, consecutive_ones: 0, seqs: [0;4]} } | |
fn num_one_diffs(&self) -> usize { self.seqs.iter().enumerate().map(|(i, n)| n*(i+1)).sum() } | |
} | |
pub fn solve(input: &String) -> Solution { | |
let mut nums:Vec<i64> = parsed_from_each_line(input); | |
let device = nums.iter().max().unwrap() + 3; | |
nums.sort(); | |
nums.push(device); | |
let r = nums.iter().fold(Data::new(), |data,adapter| { | |
match adapter-data.level { | |
1 => Data { level: *adapter, consecutive_ones: data.consecutive_ones + 1, seqs: data.seqs }, | |
3 => { | |
let mut n = data.seqs.clone(); | |
match data.consecutive_ones { | |
1..=4 => { n[data.consecutive_ones-1] += 1; Data { level: *adapter, consecutive_ones: 0, seqs: n } }, | |
_ => Data { level: *adapter, consecutive_ones: 0, seqs: n }, | |
}}, | |
_ => panic!("I didn't think this was in the data.") | |
} | |
}); | |
let num_one_diffs = r.num_one_diffs(); | |
let num_three_diffs = nums.len() - num_one_diffs; | |
let p1 = num_one_diffs * num_three_diffs; | |
let p2 = (7 as i64).pow(r.seqs[3] as u32) * (4 as i64).pow(r.seqs[2] as u32) * (2 as i64).pow(r.seqs[1] as u32); | |
Solution { part_1: p1.to_string(), part_2: p2.to_string() } | |
} |
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