81 lines
2.3 KiB
Rust
81 lines
2.3 KiB
Rust
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use anyhow::Result;
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use std::fs;
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pub fn run() -> Result<()> {
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let file_contents = fs::read_to_string("day5.txt")?;
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let mut stacks: Vec<Vec<&str>> = Vec::with_capacity(10);
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let mut moves: Vec<(usize, usize, usize)> = Vec::with_capacity(1000);
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let mut numstacks: usize = 0;
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let mut containers: Vec<&str> = Vec::with_capacity(20);
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for line in file_contents.lines() {
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if line.contains("[") {
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containers.push(line);
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} else {
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for stacknums in line.split(" ") {
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if let Ok(num) = stacknums.parse::<usize>() {
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numstacks = num;
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stacks.push(Vec::with_capacity(100))
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}
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}
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println!("found {} numstacks", numstacks);
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break;
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}
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}
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for line in containers.into_iter() {
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for index in 0..numstacks {
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let col = index * 4 + 1;
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let t = &line[col..col + 1];
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if t != " " {
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stacks[index].insert(0, t);
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}
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}
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}
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for line in file_contents.lines() {
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if !line.contains("move") {
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continue;
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}
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let mut tokens = line.split(" ");
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let count = tokens.nth(1).expect("missing count").parse::<usize>()?;
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let from = tokens.nth(1).expect("missing from").parse::<usize>()?;
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let to = tokens.nth(1).expect("missing to").parse::<usize>()?;
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moves.push((count, from, to));
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}
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let mut stacks2 = stacks.clone();
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for (count, from, to) in moves.iter() {
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for _x in 0..*count {
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let c = stacks[from - 1].pop().expect("too many pops");
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stacks[to - 1].push(c);
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}
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}
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let final_message = stacks
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.iter()
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.map(|e| e[e.len() - 1])
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.collect::<Vec<&str>>()
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.join("");
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println!("final {}", final_message);
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for (count, from, to) in moves.iter() {
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let x = stacks2[to - 1].len();
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for _ in 0..*count {
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let c = stacks2[from - 1].pop().expect("too many pops");
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stacks2[to - 1].insert(x, c);
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}
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}
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let second_message = stacks2
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.iter()
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.map(|e| e[e.len() - 1])
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.collect::<Vec<&str>>()
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.join("");
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println!("second message {}", second_message);
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Ok(())
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}
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