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Advent 2025 Day 6 Part 2

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Jos van Goor 2025-12-06 16:00:04 +01:00
parent 99cde16ca6
commit 569e7de087
2 changed files with 38 additions and 22 deletions
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56
advent_of_code_2025/src/day6/part2.rs
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@ -1,34 +1,50 @@
pub fn solve(input: &str) {
let lines = input.lines().collect::<Vec<_>>();
let transposed = input.lines().map(|line| line.as_bytes()).collect::<Vec<_>>();
let mut lines = Vec::new();
let rows = lines[..(lines.len() - 1)].iter().map(|line| {
line.split(" ").filter(|str| !str.is_empty()).map(|num| { num.parse::<u64>().unwrap() }).collect::<Vec<_>>()
for idx in 0..transposed[0].len() {
let mut line = Vec::with_capacity(transposed.len());
for row in transposed.iter() {
line.push(row[idx]);
}
lines.push(line);
}
let problems = lines.split(|line| {
line[..] == [32].repeat(line.len())
}).collect::<Vec<_>>();
let operators = lines.last().unwrap().bytes().filter(|b| *b != b' ').collect::<Vec<_>>();
// println!("rows: {rows:?}");
// println!("operators: {operators:?}");
let mut sum_of_results = 0;
let mut sum_of_operations = 0;
for (idx, operator) in operators.iter().enumerate() {
if *operator == b'*' {
for problem in problems {
let op = problem.first().unwrap().last().unwrap();
if *op == b'*' {
let mut result = 1;
for row in rows.iter() {
result *= row[idx];
for line in problem.iter() {
let cleaned = line[..(line.len() - 1)].iter().filter(|byte| **byte != b' ').copied().collect::<Vec<_>>();
// println!("cleaned: {cleaned:?}");
let parsed = unsafe { str::from_utf8_unchecked(&cleaned) }.parse::<u64>().unwrap();
// println!("parsed: {}", parsed);
result *= parsed;
}
// println!("row {idx} (*): {result}");
sum_of_operations += result;
sum_of_results += result;
// println!("result: {}", result);
} else {
let mut result = 0;
for row in rows.iter() {
result += row[idx];
for line in problem.iter() {
let cleaned = line[..(line.len() - 1)].iter().filter(|byte| **byte != b' ').copied().collect::<Vec<_>>();
// println!("cleaned: {cleaned:?}");
let parsed = unsafe { str::from_utf8_unchecked(&cleaned) }.parse::<u64>().unwrap();
// println!("parsed: {}", parsed);
result += parsed;
}
// println!("row {idx} (+): {result}");
sum_of_operations += result;
sum_of_results += result;
// println!("result: {}", result);
}
}
println!("sum of operations: {sum_of_operations}");
println!("sum of operations: {sum_of_results}");
}