commit 44e82d70e523a6b1b9daa3e6977fadae9af2f914
parent 1a536e08d9b7cd194b3745a2d7c151542455a9c4
Author: Shimmy Xu <shimmy.xu@shimmy1996.com>
Date: Thu, 2 Dec 2021 20:52:40 -0600
Add 2021 day 02
Diffstat:
| A | 2021/day02/input.txt | | | 1000 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2021/day02/main.rs | | | 64 | ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
2 files changed, 1064 insertions(+), 0 deletions(-)
diff --git a/2021/day02/input.txt b/2021/day02/input.txt
@@ -0,0 +1,1000 @@
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diff --git a/2021/day02/main.rs b/2021/day02/main.rs
@@ -0,0 +1,64 @@
+enum Command {
+ Up(i32),
+ Down(i32),
+ Forward(i32),
+}
+
+fn parse_command(s: &str) -> Option<Command> {
+ let mut it = s.split(' ');
+ let dir = it.next().unwrap();
+ let dist = it.next().unwrap().parse::<i32>().unwrap();
+ match dir {
+ "up" => Some(Command::Up(dist)),
+ "down" => Some(Command::Down(dist)),
+ "forward" => Some(Command::Forward(dist)),
+ _ => None,
+ }
+}
+
+fn main() {
+ let input = std::fs::read_to_string("input.txt")
+ .unwrap()
+ .trim()
+ .split('\n')
+ .map(|cmd| parse_command(cmd).unwrap())
+ .collect::<Vec<Command>>();
+ // 1714950
+ println!("Part 1: {}", part_1(&input));
+ // 1281977850
+ println!("Part 2: {}", part_2(&input));
+}
+
+fn part_1(input: &Vec<Command>) -> i32 {
+ let mut depth = 0;
+ let mut pos = 0;
+
+ for cmd in input {
+ match cmd {
+ Command::Up(x) => depth -= x,
+ Command::Down(x) => depth += x,
+ Command::Forward(x) => pos += x,
+ }
+ }
+
+ depth * pos
+}
+
+fn part_2(input: &Vec<Command>) -> i32 {
+ let mut depth = 0;
+ let mut pos = 0;
+ let mut aim = 0;
+
+ for cmd in input {
+ match cmd {
+ Command::Up(x) => aim -= x,
+ Command::Down(x) => aim += x,
+ Command::Forward(x) => {
+ pos += x;
+ depth += aim * x;
+ }
+ }
+ }
+
+ depth * pos
+}