This commit is contained in:
Jonathan Flueren 2022-12-03 14:45:22 +01:00
parent acd7d95238
commit d032c76265
4 changed files with 407 additions and 3 deletions

2
Cargo.lock generated
View file

@ -3,5 +3,5 @@
version = 3
[[package]]
name = "advent_of_code2022"
name = "advent-of-code-2022"
version = "0.1.0"

300
res/03/input.txt Normal file
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104
src/d03.rs Normal file
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@ -0,0 +1,104 @@
use std::collections::HashMap;
use std::collections::HashSet;
use std::fs;
pub fn d03() {
let path = "res/03/input.txt";
let contents = fs::read_to_string(path).expect("Should have been able to read the file");
let cont_arr = contents.split("\n");
// build alphabet as hashmap
let mut alphabet = HashMap::<char, i32>::new();
let alphabet_chars: Vec<char> = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
.chars()
.collect();
alphabet_chars.iter().enumerate().for_each(|(i, a)| {
alphabet.insert(*a, (i + 1) as i32);
});
// parse rucksacks into 2d i32 vec
let rucksacks: Vec<Vec<i32>> = cont_arr
.into_iter()
.filter(|line| *line != "") // filter out empty lines
.map(|line| {
line.chars()
.into_iter()
.map(|c| *(alphabet.get(&c).unwrap()))
.collect()
})
.collect();
// 1st task
// calculate results - split each rucksack in half and find & sum up duplicates between halves
let results: Vec<i32> = rucksacks
.iter()
.map(|r| {
let (r1, r2) = r.split_at(r.len() / 2);
return first_duplicate_value(&r1.to_vec(), &r2.to_vec());
})
.collect();
let result: i32 = results.iter().sum();
println!("Result 1: {}", result);
// 2nd task
// calculate results - find duplicates in each 3-rucksack groups and sum up
let mut result = 0;
for i in 0..rucksacks.len()/3 {
result += first_triplicate_value(
&rucksacks[i*3],
&rucksacks[i*3 + 1],
&rucksacks[i*3 + 2]
);
}
println!("Result 2: {}", result);
}
// returns first duplicate value of 2 vecs or 0
fn first_duplicate_value(vec1: &Vec<i32>, vec2: &Vec<i32>) -> i32 {
let mut vec_set = HashSet::<i32>::new();
let mut res = 0;
vec1.iter().for_each(|i| {
vec_set.insert(*i);
});
vec2.iter().for_each(|i| {
if vec_set.contains(i) {
res = *i;
return;
}
});
res
}
// returns first duplicate value of 3 vecs or 0
fn first_triplicate_value(vec1: &Vec<i32>, vec2: &Vec<i32>, vec3: &Vec<i32>) -> i32 {
let mut vec_set1 = HashSet::<i32>::new();
let mut vec_set2 = HashSet::<i32>::new();
let mut res = 0;
vec1.iter().for_each(|i| {
vec_set1.insert(*i);
});
vec2.iter().for_each(|i| {
vec_set2.insert(*i);
});
vec3.iter().for_each(|i| {
if vec_set1.contains(i) && vec_set2.contains(i) {
res = *i;
return;
}
});
res
}

View file

@ -1,5 +1,5 @@
mod d02;
mod d03;
fn main() {
d02::d02();
d03::d03();
}