2022 - Day 25 [Merry Christmas!]

2022/input/25/input

@@ -0,0 +1,116 @@
+1=-=2=-1000=0
+11=001122
+120-
+1-0
+202-0==-2-
+2-1010=2-2=01
+112=-2
+2-0=
+1-=2-=-1-0--0=1=0000
+1=0=0--021-0
+11000101=210
+21-111=2112=2==-
+111010-2
+2=10=-101-=--0
+2-=-2000012=0022=
+1-=11-01--2100
+1=2211-2-===
+2=--2-==-1
+1=12---02=2
+1==0=--11=01-1-
+121-21021
+12=1001=2=-=22
+1=2-212=2-0211
+20----11=
+10=100=0=0
+111
+1=--011==2--212121=
+2=-10=210200-2-=0
+1=-122=001-1
+2-0=0121=-0=0
+2-=20--1-=21-22=1=
+20011
+12=1--=-0--10-0=1-=
+2002=100=-00-
+202
+1=2==21-
+1=221--01=00-10=
+1--0-1=
+2-==11=222---
+21-10-=22
+1=--22-0-
+2-0-
+1-0=-2
+20-02102
+1=0=20----21=12=-
+20=111-12=21101=
+111=1=-2=0=--21
+11-
+10-1=01=-
+1222-10
+1=2-1
+20
+101==12-1-0
+1-=22=--=22=1=22
+1200-010-10=021
+1=2-10=-02--=-
+12-0=000=0
+1==10=00===1--
+2-1=-=1===1=-0=---
+1=11=120
+2===002010=-=0
+1==00212=01-002=221
+10020221===-
+1--01=-=0-20-101-=-
+112=101
+10-
+1220=1
+2=
+1=1120=--0
+11-21200=
+2==011-10-0==0=0=
+12-=102
+100-022
+1=1
+201-0--=-
+2-02
+21=11=00020
+12=20-
+1101=00-1
+1=0=-11--=-010-==1
+1-2-0=00=-=220=11-
+2-2
+12-2
+12=10=2-=
+20222110-10002
+1002=0
+12=11-=012
+1==
+1=00-01
+110101222-020--111
+2-0
+1-12=1
+222-10-12=00
+11=1=1
+10=2-00-121-2-=2
+1---22-1-0=00-1220
+2-=2210=-==2=010=
+12201-111-220
+2=122=022=22=12-1
+211===2=020
+121-2-0-=0==2=1
+1-0221200-21100-
+10
+1-11
+2===2=-2-
+1-0-2021-21==
+1==-00-=2-21===1200
+22
+1222=20=120=1-
+11=120001012==01-1
+2=-1--00
+10==121--221
+1=2100102=20012
+2==1-
+1-
+10-2--0

2022/input/25/test-1

@@ -0,0 +1,13 @@
+1=-0-2
+12111
+2=0=
+21
+2=01
+111
+20012
+112
+1=-1=
+1-12
+12
+1=
+122

2022/src/bin/day25.rs

@@ -0,0 +1,97 @@
+#![feature(test)]
+use anyhow::Result;
+use aoc::Solver;
+
+// -- Runners --
+fn main() -> Result<()> {
+    Day::solve()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn part1_test1() -> Result<()> {
+        Day::test(Day::part1, "test-1", "2=-1=0".to_owned())
+    }
+    #[test]
+    fn part1_solution() -> Result<()> {
+        Day::test(Day::part1, "input", "2-20=01--0=0=0=2-120".to_owned())
+    }
+
+    // Benchmarks
+    extern crate test;
+    #[bench]
+    #[ignore]
+    fn part1_bench(b: &mut test::Bencher) {
+        Day::benchmark(Day::part1, b)
+    }
+    #[bench]
+    #[ignore]
+    fn part2_bench(b: &mut test::Bencher) {
+        Day::benchmark(Day::part2, b)
+    }
+}
+
+// -- Solution --
+pub struct Day;
+impl aoc::Solver for Day {
+    type Output1 = String;
+    type Output2 = String;
+
+    fn day() -> u8 {
+        25
+    }
+
+    fn part1(input: &str) -> Self::Output1 {
+        let mut sum: isize = input
+            .trim()
+            .lines()
+            .map(|line| {
+                line.chars().rev().enumerate().fold(0, |acc, (idx, c)| {
+                    let num = match c {
+                        '2' => 2,
+                        '1' => 1,
+                        '0' => 0,
+                        '-' => -1,
+                        '=' => -2,
+                        _ => panic!("Invalid number!"),
+                    };
+
+                    acc + num * 5_isize.pow(idx as u32)
+                })
+            }).sum();
+
+        let mut result = String::new();
+        while sum > 0 {
+            let mut carry = 0;
+            let rem = sum % 5;
+            match rem {
+                0 => result += "0",
+                1 => result += "1",
+                2 => result += "2",
+                3 => {
+                    result += "=";
+                    carry += 1;
+                },
+                4 => {
+                    result += "-";
+                    carry += 1;
+                },
+                _ => unreachable!("Number is mod 5 so should always be 0..=4"),
+            }
+
+            sum = sum/5 + carry;
+        }
+        // Reverse the string, since we construct it the wrong way around
+        result = result.chars().rev().collect();
+
+        result
+    }
+
+    fn part2(_input: &str) -> Self::Output2 {
+        // There is no part 2!
+        "Merry Christmas!".to_owned()
+    }
+}