From 59826b861c1dabd7cac8558c668172187b45ae9c Mon Sep 17 00:00:00 2001
From: Yigit Sever
Date: Fri, 2 Dec 2022 21:58:46 +0300
Subject: 2022, day2: part 1 done
---
2022/day2/part1/src/main.rs | 31 +++++++++++++++++++++++--------
1 file changed, 23 insertions(+), 8 deletions(-)
(limited to '2022/day2/part1')
diff --git a/2022/day2/part1/src/main.rs b/2022/day2/part1/src/main.rs
index 44ebe3a..81b20df 100644
--- a/2022/day2/part1/src/main.rs
+++ b/2022/day2/part1/src/main.rs
@@ -1,8 +1,16 @@
-let rps_result = vec![4, 1, 7, 8, 5, 2, 3, 9 ,6];
-
+/// opponent
+/// R P S
+/// me A B C
+/// 1 R X 4 1 7
+/// 2 P Y 8 5 2
+/// 3 S Z 3 9 6
+///
+/// idx = 3 * op_idx + my_idx
+const RPS_RESULTS: [usize; 9] = [4, 1, 7, 8, 5, 2, 3, 9, 6];
fn main() {
- let score = include_str!("../../example").lines().fold(0, parse_line);
+ let score = include_str!("../../input").lines().fold(0, parse_line);
+ println!("{}", score);
}
fn parse_line(score: usize, line: &str) -> usize {
@@ -10,12 +18,19 @@ fn parse_line(score: usize, line: &str) -> usize {
let opponent_move = moves.next().unwrap();
let my_move = moves.next().unwrap();
- match opponent_move {
- "A" => 1,
- "B" => 2,
- "C" => 3,
+ let my_idx = match opponent_move {
+ "A" => 0,
+ "B" => 1,
+ "C" => 2,
+ _ => unreachable!(),
+ };
+
+ let op_idx = match my_move {
+ "X" => 0,
+ "Y" => 1,
+ "Z" => 2,
_ => unreachable!(),
};
- 0 + score
+ RPS_RESULTS[3 * op_idx + my_idx] + score
}
--
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