71 lines
2.0 KiB
Rust
71 lines
2.0 KiB
Rust
use std::fs;
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fn main() {
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let input = fs::read_to_string("input.txt").unwrap();
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let input: Vec<_> = input.split('\n')
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.map(|line| {
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line.split_whitespace()
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.map(|num| num.parse::<i64>().unwrap())
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.collect::<Vec<_>>()
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}).collect();
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let mut total = 0;
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for line in input {
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let mut line_starters: Vec<i64> = vec![*line.first().unwrap()];
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let mut cur_line: Vec<i64> = line;
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while !cur_line.iter().all(|x| *x == 0) {
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let mut next_line: Vec<i64> = vec![];
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for i in 1..cur_line.len() {
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let diff = cur_line[i] - cur_line[i-1];
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next_line.push(diff)
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}
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line_starters.push(*next_line.first().unwrap());
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cur_line = next_line;
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}
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let mut sum = 0;
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for i in (1..line_starters.len()).rev() {
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sum = line_starters[i - 1] - sum;
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}
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total += sum;
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}
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println!("{:?}", total)
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}
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// use std::fs;
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// fn main() {
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// let input = fs::read_to_string("input.txt").unwrap();
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// let input: Vec<_> = input.split('\n')
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// .map(|line| {
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// line.split_whitespace()
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// .map(|num| num.parse::<i64>().unwrap())
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// .collect::<Vec<_>>()
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// }).collect();
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// let mut total = 0;
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// for line in input {
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// let mut line_enders: Vec<i64> = vec![*line.last().unwrap()];
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// let mut cur_line: Vec<i64> = line;
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// while !cur_line.iter().all(|x| *x == 0) {
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// let mut next_line: Vec<i64> = vec![];
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// for i in 1..cur_line.len() {
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// let diff = cur_line[i] - cur_line[i-1];
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// next_line.push(diff)
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// }
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// line_enders.push(*next_line.last().unwrap());
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// cur_line = next_line;
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// }
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// let mut sum = 0;
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// for i in (1..line_enders.len()).rev() {
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// sum = sum + line_enders[i - 1];
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// }
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// total += sum;
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// }
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// println!("{:?}", total)
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// }
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