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use std::collections::HashMap;
use std::collections::VecDeque;
pub fn part1(input: &str) -> String {
let mut h: Vec<VecDeque<char>> = Vec::with_capacity(10);
h.resize(10, VecDeque::new());
let split: Vec<&str> = input.split("\n\n").collect();
let mut m: HashMap<usize, usize> = HashMap::new();
let mut i = 0;
let mut j = 1;
while i < 10 {
m.insert(j, i);
j += 4;
i += 1;
}
assert!(split.len() == 2);
for line in split[0].lines() {
if line.chars().nth(1).unwrap() == '1' {
continue;
}
for (i, ch) in line.chars().enumerate() {
match ch {
' ' | '[' | ']' => {
continue;
}
x => {
let idx = m[&i];
h[idx].push_front(x);
}
};
}
}
for line in split[1].lines() {
let actions: Vec<usize> = line
.split(' ')
.enumerate()
.filter(|&(i, _)| i % 2 == 1)
.map(|(_, e)| e.parse::<usize>().unwrap())
.collect();
for _ in 0..actions[0] {
let x = h[actions[1] - 1].pop_back().unwrap();
h[actions[2] - 1].push_back(x);
}
}
let mut s = String::new();
for mut e in h {
if e.len() == 0 {
continue;
}
let x = e.pop_back().unwrap().to_string();
s += &x;
}
s
}
pub fn part2(input: &str) -> String {
let mut h: Vec<VecDeque<char>> = Vec::with_capacity(10);
h.resize(10, VecDeque::new());
let split: Vec<&str> = input.split("\n\n").collect();
let mut m: HashMap<usize, usize> = HashMap::new();
let mut i = 0;
let mut j = 1;
while i < 10 {
m.insert(j, i);
j += 4;
i += 1;
}
assert!(split.len() == 2);
for line in split[0].lines() {
if line.chars().nth(1).unwrap() == '1' {
continue;
}
for (i, ch) in line.chars().enumerate() {
match ch {
' ' | '[' | ']' => {
continue;
}
x => {
let idx = m[&i];
h[idx].push_front(x);
}
};
}
}
for line in split[1].lines() {
let actions: Vec<usize> = line
.split(' ')
.enumerate()
.filter(|&(i, _)| i % 2 == 1)
.map(|(_, e)| e.parse::<usize>().unwrap())
.collect();
let mut xs = Vec::<char>::new();
for _ in 0..actions[0] {
xs.push(h[actions[1] - 1].pop_back().unwrap());
}
xs.reverse();
for x in xs {
h[actions[2] - 1].push_back(x);
}
}
let mut s = String::new();
for mut e in h {
if e.len() == 0 {
continue;
}
let x = e.pop_back().unwrap().to_string();
s += &x;
}
s
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_example() {
let input = include_str!("../example.txt");
assert_eq!(part1(input), String::from("CMZ"));
}
#[test]
fn test_input1() {
let input = include_str!("../input.txt");
assert_eq!(part1(input), String::from("RTGWZTHLD"));
}
#[test]
fn test_example2() {
let input = include_str!("../example.txt");
assert_eq!(part2(input), String::from("MCD"));
}
#[test]
fn test_input2() {
let input = include_str!("../input.txt");
assert_eq!(part2(input), String::from("STHGRZZFR"));
}
}
|
