43 lines
1.2 KiB
Rust
43 lines
1.2 KiB
Rust
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use std::{
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collections::HashMap,
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fs::File,
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io::{BufRead, BufReader},
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};
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#[allow(dead_code)]
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fn day1_1() {
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let reader = BufReader::new(File::open("input.txt").unwrap());
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let mut a = Vec::<i32>::new();
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let mut b = Vec::<i32>::new();
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for line in reader.lines() {
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let line = line.unwrap();
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let (a1, b1) = line.trim_end().split_once(" ").unwrap();
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a.push(a1.parse().unwrap());
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b.push(b1.parse().unwrap());
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}
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a.sort_unstable();
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b.sort_unstable();
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let result: i32 = a.into_iter().zip(b).map(|(a, b)| (a - b).abs()).sum();
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println!("{result}");
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}
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#[allow(dead_code)]
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fn day1_2() {
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let reader = BufReader::new(File::open("input.txt").unwrap());
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let mut a = Vec::<u32>::new();
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let mut b = HashMap::<u32, u32>::new();
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for line in reader.lines() {
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let line = line.unwrap();
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let (a1, b1) = line.trim_end().split_once(" ").unwrap();
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a.push(a1.parse().unwrap());
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*b.entry(b1.parse().unwrap()).or_insert(0) += 1;
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}
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let result: u32 = a.into_iter().map(|a| a * *b.get(&a).unwrap_or(&0)).sum();
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println!("{result}");
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}
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fn main() {
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day1_1();
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day1_2();
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}
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