Day2 and day3

This commit is contained in:
Sebastian 2022-12-03 17:21:13 +01:00
parent 9e0effe8e4
commit dbf91b37d8
4 changed files with 2946 additions and 0 deletions

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src/bin/day2.rs Normal file
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use std::error::Error;
use std::fs::File;
use std::io::{self, BufRead};
use std::vec::Vec;
fn calc_points(other: &str, me: &str) -> u32 {
match other {
"A" => match me {
"X" => 1 + 3,
"Y" => 2 + 6,
"Z" => 3 + 0,
_ => 0,
},
"B" => match me {
"X" => 1 + 0,
"Y" => 2 + 3,
"Z" => 3 + 6,
_ => 0,
},
"C" => match me {
"X" => 1 + 6,
"Y" => 2 + 0,
"Z" => 3 + 3,
_ => 0,
},
_ => 0,
}
}
fn calc_points2(other: &str, me: &str) -> u32 {
match other {
"A" => match me {
"X" => 3 + 0,
"Y" => 1 + 3,
"Z" => 2 + 6,
_ => 0,
},
"B" => match me {
"X" => 1 + 0,
"Y" => 2 + 3,
"Z" => 3 + 6,
_ => 0,
},
"C" => match me {
"X" => 2 + 0,
"Y" => 3 + 3,
"Z" => 1 + 6,
_ => 0,
},
_ => 0,
}
}
fn main() -> Result<(), Box<dyn Error>> {
let file = File::open("inputs/day2.txt")?;
let lines = io::BufReader::new(file).lines().map(|l| l.unwrap());
let rounds: Vec<(String, String)> = lines
.map(|l| {
println!("line: {}", l);
let mut parts = l.split(" ");
(
parts.next().unwrap().to_owned(),
parts.next().unwrap().to_owned(),
)
})
.collect();
let points = rounds.iter().fold(0, |p, r| p + calc_points(&r.0, &r.1));
println!("Answer Part1: {}", points);
let points2 = rounds.iter().fold(0, |p, r| p + calc_points2(&r.0, &r.1));
println!("Answer Part2: {}", points2);
Ok(())
}

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use std::collections::HashSet;
use std::error::Error;
use std::fs::File;
use std::io::{self, BufRead};
use std::vec::Vec;
fn prio(c: &char) -> u32 {
if *c >= 'a' && *c <= 'z' {
1 + *c as u32 - 'a' as u32
} else if *c >= 'A' && *c <= 'Z' {
27 + *c as u32 - 'A' as u32
} else {
0u32
}
}
fn main() -> Result<(), Box<dyn Error>> {
let file = File::open("inputs/day3.txt")?;
let lines = io::BufReader::new(file).lines().map(|l| l.unwrap());
let backpacks: Vec<(HashSet<char>, HashSet<char>)> = lines
.map(|l| {
let middle = l.len() / 2;
let compartment1: HashSet<char> = l[0..middle].chars().collect();
let compartment2: HashSet<char> = l[middle..].chars().collect();
(compartment1, compartment2)
})
.collect();
let mut answer1 = 0;
for (comp1, comp2) in backpacks.iter() {
let in_both = comp1.intersection(&comp2).nth(0).unwrap();
answer1 += prio(in_both);
}
println!("Answer Part1: {}", answer1);
let mut answer2 = 0;
for group in backpacks.chunks(3) {
let backpack1: HashSet<char> = group[0]
.0
.union(&group[0].1)
.map(|c| c.to_owned())
.collect();
let backpack2: HashSet<char> = group[1]
.0
.union(&group[1].1)
.map(|c| c.to_owned())
.collect();
let backpack3: HashSet<char> = group[2]
.0
.union(&group[2].1)
.map(|c| c.to_owned())
.collect();
let in_both: HashSet<char> = backpack1
.intersection(&backpack2)
.map(|c| c.to_owned())
.collect();
let in_all = backpack3.intersection(&in_both).nth(0).unwrap();
answer2 += prio(in_all);
}
println!("Answer Part2: {}", answer2);
Ok(())
}