Complete part1 of day3

This commit is contained in:
Timothy Warren 2022-12-05 09:53:43 -05:00
parent efda7126ca
commit e1a178789c

View File

@ -1,3 +1,77 @@
fn get_rucksack_items(list: &str) -> (Vec<char>, Vec<char>) {
let all_chars: Vec<_> = list.chars().collect();
let half_index = all_chars.len() / 2;
let halves = all_chars.split_at(half_index);
assert_eq!(halves.0.len(), halves.1.len());
(halves.0.to_vec(), halves.1.to_vec())
}
fn get_priority(item: char) -> u32 {
let is_uppercase = item.is_ascii_uppercase();
let char = if is_uppercase {
item.to_ascii_lowercase()
} else {
item
};
let priority = match char {
'a' => 1,
'b' => 2,
'c' => 3,
'd' => 4,
'e' => 5,
'f' => 6,
'g' => 7,
'h' => 8,
'i' => 9,
'j' => 10,
'k' => 11,
'l' => 12,
'm' => 13,
'n' => 14,
'o' => 15,
'p' => 16,
'q' => 17,
'r' => 18,
's' => 19,
't' => 20,
'u' => 21,
'v' => 22,
'w' => 23,
'x' => 24,
'y' => 25,
'z' => 26,
_ => 0,
};
if is_uppercase {
priority + 26
} else {
priority
}
}
fn find_same_item(a: Vec<char>, b: Vec<char>) -> char {
for ch in a {
if b.contains(&ch) {
return ch;
}
}
panic!("We should have already found the item")
}
fn main() {
let file_str = include_str!("input.txt");
let sum: u32 = file_str
.lines()
.map(|line| get_rucksack_items(line))
.map(|(a, b)| find_same_item(a, b))
.map(|item| get_priority(item))
.sum();
println!("Part 1 Priority Sum: {}", sum);
}