y2016d2

y2016/resources/2_input.txt

@@ -0,0 +1,5 @@
+LLULLLRLDLLLRLUURDDLRDLDURULRLUULUDDUDDLLLURRLDRRLDRRRLDUDLRDLRRDLLDUDUDUDRLUDUUDLLLRDURUDUULUDLRDUUUDUUDURLDUULLRDLULDUURUDRDDLDRLURLRURRDUURLRLUURURUUULLRLLULRUURLULURDLLRRUDLUDULDRDRLRULUURRDRULLRUUUDLRLDLUURRRURDLUDDRRUDRLUDRDLLLLLRULLDUDRLRRDDULDLRUURRRRRLDLDLRDURDRUUURDLRDDDDULURRRRDUURLULLLDLRULRDULRUDLRRLRDLLRLLLUDDLRDRURDDLLLLDUDRDLRURRDLRDDDLDULDRLRULUUDRRRUUULLLURRDDUULURULDURRLLULLDRURUUULRLRDRRUDRDRRDURRUUUULDRDDDUDLDDURLLRR
+LDLRRRUURDLDDRLRRDLLULRULLLUDUUDUDLRULLDRUDRULLDULURDRDDLRURDDULLLLDLRDRDRDDURLURLURLUDRDDRDULULUDDRURRDLLDUURDRDDLRLLURRDLRDDULDLULURDRDLUDRRUUDULLULURRDUDRUUUDRULDLDURLRRUDURLDLRRUURRRURDLUDRLDUDRRUDUURURUDDUUDRDULRDLUDRRRLDRURLLRDDDLUDRDUDURDDDRRDDRRRLLRRDDLDDLRUURRURDLLDRLRRDLLUDRRRURURLRDRLLRLRLRULLRURLDLRRULLRRRDULUUULDRDLLURDDLDLRDRLUUDLLUDDLDRRLDLRUDRUDLLUURLLULURUDUDRLULLUDRURDDLDLDDUDLRDDRRURLRLLUDDUDRUURRURRULDRLDDRLLRRLDDURRDLDULLLURULLLRUURLRRRRUUULRLLLURRLRLRUDRDUUUDUUUDDLULLDLLLLDLDRULDRUUULDDDLURLDLRLULRUDDDDURDDLU
+RURLURRDLDULLULDDDLRUULLUURLRUDRUDRRUDDLDDDDRRDLRURLRURLDDDUDDUURRDRULDRRRULRDRDDLRUDULRLURDUUDRRLDLRDRURDLDRRRRDRURUUDDDLLRDRDUDUDUDLLULURULRRLRURUULUULDDDDURULRULLRUDUURLURDUDLUDLUDRLLDUUDUULRLRLUUDRDULDULRURDRRRULRUDLRURDDULUDULLRLRURURUULLULDRURLLRRUUDDUUURRDLURUURULRDRRDDUDULRDDLUDLURURUURDRULLRDDLLRDDLDRDUDRRDLUURRLRLUURRULUDURLDDRLLURRDDDLDDRURULLDDRLUDDLRLURDUDULLRDULLLDLLUDDRUDRUDDUUDRDRULRL
+RLRDRDULULUDLUDRDRLUDLDLLUDURULDDDUDLRURLLRLRLDLDRLDURDLRRURLULLULURLLDRRDRLUDRLRDLLULRULURRURURUULRDUDLLRDLRRRRRLUURDRRRDLRUDLLDLLDLRUUUDLLLDDDLRDULLRUUDDRLDDURRRDLRLRLDDDDLRDRULLUURUUDRRLLRLLRDDLLRURRRRDRULRRLLRLLLRLDRRLDDDURRURLDURUURRLRLRLDRURULLRLRUDLDUURDLLRLDLURUUUDLLRDRDDDDDDRLDRRRLRRRRURUDLDDRDLLURUDLRRLDDDLUDUDUULRDULULUDDULUUDLLLLRLDDUUULRLRDULURDURRRURRULURRRDRDLDDURDLURUDURRRDDRLRLUDLUDDLUULLDURLURDDUDDLRUUUDRLLDRURL
+ULUDLLUDDULRUURDRURDUDUDLUURDDDRRLUDURURDRURRLDRDURLRLLRRDDRRDRRRUULURUDURUDULRRRRDDLDURRLRRDUDDDRLLLULDRLRLURRDUURDURRRURRDLUDUDDRLDLURRRDDRLLRDRDDRDURRRRLURRLUDDURRULRUDUDULDRUDDRULLUUULDURRRLDRULLURULLRUDLDUDDLDULDLUUDRULULDLLDRULLRUULDUDUUDRLRRLDLUULUDLLDDRLRRDDLLURURDULRRDDRURDRLRLULDLDURULLUUUDURURDLDUDDDDUUULUDLUURRULLDLRLURDLURLRLDDURRLDDRRRDUUULLUULDLLDLLDDRLRRUDLULDRLULDULULRRLRULUUURURUUURDUUDDURLLUDDRLRDDLUURRUULRDLDDRLULUULRDRURLUURDRDUURUDLRR

y2016/src/bin/d2.rs

@@ -0,0 +1,20 @@
+use std::fs;
+
+use y2016::days::d2;
+
+fn main() {
+    part1();
+    part2();
+}
+
+fn part1() {
+    let root = env!("CARGO_MANIFEST_DIR");
+    let content = fs::read_to_string(format!("{root}/resources/2_input.txt")).unwrap();
+    println!("{}", d2::process_part1(&content));
+}
+
+fn part2() {
+    let root = env!("CARGO_MANIFEST_DIR");
+    let content = fs::read_to_string(format!("{root}/resources/2_input.txt")).unwrap();
+    println!("{}", d2::process_part2(&content));
+}

y2016/src/days/d2.rs

@@ -0,0 +1,133 @@
+use core::panic;
+
+pub fn process_part1(input: &str) -> String {
+    let mut position = (0, 0);
+    input
+        .lines()
+        .map(|line| {
+            for char in line.chars() {
+                match char {
+                    'U' => {
+                        if position.1 != -1 {
+                            position.1 -= 1;
+                        }
+                    }
+                    'D' => {
+                        if position.1 != 1 {
+                            position.1 += 1;
+                        }
+                    }
+                    'L' => {
+                        if position.0 != -1 {
+                            position.0 -= 1;
+                        }
+                    }
+                    'R' => {
+                        if position.0 != 1 {
+                            position.0 += 1;
+                        }
+                    }
+                    _ => panic!("Unknown direction {char}"),
+                }
+            }
+            key_from_position(position)
+        })
+        .collect::<Vec<String>>()
+        .join("")
+}
+
+fn key_from_position(position: (i32, i32)) -> String {
+    match position {
+        (-1, -1) => "1",
+        (0, -1) => "2",
+        (1, -1) => "3",
+        (-1, 0) => "4",
+        (0, 0) => "5",
+        (1, 0) => "6",
+        (-1, 1) => "7",
+        (0, 1) => "8",
+        (1, 1) => "9",
+        (_, _) => panic!("No key at position {}, {}", position.0, position.1),
+    }
+    .to_string()
+}
+
+pub fn process_part2(input: &str) -> String {
+    let mut position: (i32, i32) = (-2, 0);
+    input
+        .lines()
+        .map(|line| {
+            for char in line.chars() {
+                let v_bound = 2 - position.0.abs();
+                let h_bound = 2 - position.1.abs();
+                match char {
+                    'U' => {
+                        if position.1 > -v_bound {
+                            position.1 -= 1;
+                        }
+                    }
+                    'D' => {
+                        if position.1 < v_bound {
+                            position.1 += 1;
+                        }
+                    }
+                    'L' => {
+                        if position.0 > -h_bound {
+                            position.0 -= 1;
+                        }
+                    }
+                    'R' => {
+                        if position.0 < h_bound {
+                            position.0 += 1;
+                        }
+                    }
+                    _ => panic!("Unknown direction {char}"),
+                }
+            }
+            key_from_position_p2(position)
+        })
+        .collect::<Vec<String>>()
+        .join("")
+}
+
+fn key_from_position_p2(position: (i32, i32)) -> String {
+    match position {
+        (0, -2) => "1",
+        (-1, -1) => "2",
+        (0, -1) => "3",
+        (1, -1) => "4",
+        (-2, 0) => "5",
+        (-1, 0) => "6",
+        (0, 0) => "7",
+        (1, 0) => "8",
+        (2, 0) => "9",
+        (-1, 1) => "A",
+        (0, 1) => "B",
+        (1, 1) => "C",
+        (0, 2) => "D",
+        (_, _) => panic!("No key at position {}, {}", position.0, position.1),
+    }
+    .to_string()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const INPUT: &str = "ULL
+RRDDD
+LURDL
+UUUUD";
+
+    #[test]
+    fn part1() {
+        let result = process_part1(INPUT);
+        assert_eq!(result, "1985".to_string());
+    }
+
+    #[test]
+    fn part2() {
+        let result = process_part2(INPUT);
+        assert_eq!(result, "5DB3".to_string());
+    }
+}

y2016/src/days/mod.rs

@@ -1 +1,3 @@
 pub mod d1;
+
+pub mod d2;