[2016][rust][1.0]

2016/input/day_01.txt

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+R4, R3, L3, L2, L1, R1, L1, R2, R3, L5, L5, R4, L4, R2, R4, L3, R3, L3, R3, R4, R2, L1, R2, L3, L2, L1, R3, R5, L1, L4, R2, L4, R3, R1, R2, L5, R2, L189, R5, L5, R52, R3, L1, R4, R5, R1, R4, L1, L3, R2, L2, L3, R4, R3, L2, L5, R4, R5, L2, R2, L1, L3, R3, L4, R4, R5, L1, L1, R3, L5, L2, R76, R2, R2, L1, L3, R189, L3, L4, L1, L3, R5, R4, L1, R1, L1, L1, R2, L4, R2, L5, L5, L5, R2, L4, L5, R4, R4, R5, L5, R3, L1, L3, L1, L1, L3, L4, R5, L3, R5, R3, R3, L5, L5, R3, R4, L3, R3, R1, R3, R2, R2, L1, R1, L3, L3, L3, L1, R2, L1, R4, R4, L1, L1, R3, R3, R4, R1, L5, L2, R2, R3, R2, L3, R4, L5, R1, R4, R5, R4, L4, R1, L3, R1, R3, L2, L3, R1, L2, R3, L3, L1, L3, R4, L4, L5, R3, R5, R4, R1, L2, R3, R5, L5, L4, L1, L1

2016/rust/.gitignore

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+target

2016/rust/Cargo.lock

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+[root]
+name = "advent_of_code_2016"
+version = "0.1.0"
+

2016/rust/Cargo.toml

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+[package]
+name = "advent_of_code_2016"
+version = "0.1.0"
+authors = ["Alpha Chen <alpha.chen@gmail.com>"]
+
+[dependencies]

2016/rust/src/main.rs

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+use std::io;
+use std::io::Read;
+use std::f32::consts::PI;
+
+fn solve(input: &str) -> String {
+  let mut turtle = (-PI / 2.0, (0, 0));
+
+  for step in input.split(", ") {
+    let mut chars = step.chars();
+    let dir = chars.next().unwrap();
+    let blocks = chars.collect::<String>().parse::<f32>().unwrap();
+
+    turtle.0 += match dir {
+      'R' => PI / 2.0,
+      'L' => -PI / 2.0,
+      _ => {
+        unreachable!();
+      }
+    };
+
+    let movement = turtle.0.sin_cos();
+    (turtle.1).0 += (blocks*movement.1) as i32;
+    (turtle.1).1 += (blocks*movement.0) as i32;
+  }
+
+  ((turtle.1).0.abs() + (turtle.1).1.abs()).to_string()
+}
+
+#[test]
+fn test_solve() {
+  assert_eq!(solve("R2, L3"), "5".to_string());
+  assert_eq!(solve("R2, R2, R2"), "2".to_string());
+  assert_eq!(solve("R5, L5, R5, R3"), "12".to_string());
+}
+
+fn main() {
+  let mut input = String::new();
+  io::stdin().read_to_string(&mut input).ok();
+
+  println!("{}", solve(&input));
+}