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day9 part2

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Candygoblen123 2023-12-11 09:52:06 -05:00
parent 9fd55c3aac
commit 2c3840f65a
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1 changed files with 40 additions and 4 deletions
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day09/src/main.rs
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@ -12,7 +12,7 @@ fn main() {
let mut total = 0; let mut total = 0;
for line in input { for line in input {
let mut line_enders: Vec<i64> = vec![*line.last().unwrap()]; let mut line_starters: Vec<i64> = vec![*line.first().unwrap()];
let mut cur_line: Vec<i64> = line; let mut cur_line: Vec<i64> = line;
while !cur_line.iter().all(|x| *x == 0) { while !cur_line.iter().all(|x| *x == 0) {
let mut next_line: Vec<i64> = vec![]; let mut next_line: Vec<i64> = vec![];
@ -20,15 +20,51 @@ fn main() {
let diff = cur_line[i] - cur_line[i-1]; let diff = cur_line[i] - cur_line[i-1];
next_line.push(diff) next_line.push(diff)
} }
line_enders.push(*next_line.last().unwrap()); line_starters.push(*next_line.first().unwrap());
cur_line = next_line; cur_line = next_line;
} }
let mut sum = 0; let mut sum = 0;
for i in (1..line_enders.len()).rev() { for i in (1..line_starters.len()).rev() {
sum = sum + line_enders[i - 1]; sum = line_starters[i - 1] - sum;
} }
total += sum; total += sum;
} }
println!("{:?}", total) println!("{:?}", total)
} }
// use std::fs;
// fn main() {
// let input = fs::read_to_string("input.txt").unwrap();
// let input: Vec<_> = input.split('\n')
// .map(|line| {
// line.split_whitespace()
// .map(|num| num.parse::<i64>().unwrap())
// .collect::<Vec<_>>()
// }).collect();
// let mut total = 0;
// for line in input {
// let mut line_enders: Vec<i64> = vec![*line.last().unwrap()];
// let mut cur_line: Vec<i64> = line;
// while !cur_line.iter().all(|x| *x == 0) {
// let mut next_line: Vec<i64> = vec![];
// for i in 1..cur_line.len() {
// let diff = cur_line[i] - cur_line[i-1];
// next_line.push(diff)
// }
// line_enders.push(*next_line.last().unwrap());
// cur_line = next_line;
// }
// let mut sum = 0;
// for i in (1..line_enders.len()).rev() {
// sum = sum + line_enders[i - 1];
// }
// total += sum;
// }
// println!("{:?}", total)
// }