Add day 25

Author: LinAGKar

day25/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day25"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day25/src/main.rs

@@ -0,0 +1,43 @@
+use std::io::Read;
+
+fn main() {
+    let mut input = String::new();
+    std::io::stdin().read_to_string(&mut input).unwrap();
+
+    let mut sum = input.lines().map(|line| {
+        line.chars().fold(0, |acc, c| {
+            acc * 5 + match c {
+                '=' => -2,
+                '-' => -1,
+                '0' => 0,
+                '1' => 1,
+                '2' => 2,
+                _ => panic!(),
+            }
+        })
+    }).sum::<i64>();
+
+    let mut digits = ['0'; 27];
+
+    for c in &mut digits {
+        let x = sum + 2;
+        let digit = x.rem_euclid(5) - 2;
+        sum = x.div_euclid(5);
+        *c = match digit {
+            -2 => '=',
+            -1 => '-',
+            0 => '0',
+            1 => '1',
+            2 => '2',
+            _ => panic!(),
+        };
+        if sum == 0 {
+            break;
+        }
+    }
+
+    for c in digits.into_iter().rev().skip_while(|&c| c == '0') {
+        print!("{}", c);
+    }
+    println!();
+}

day25_input.txt

@@ -0,0 +1,120 @@
+21-2-0=1-
+2-11220-==01==2
+1-2200=1=0--
+1-10--22=-=-2
+21120
+1=0==
+10=022
+222--0=10202-0=2
+1=01==1
+1021
+20--221-222000
+12-1=02--0221=-1
+11-=-1===2-
+1-101-=
+11-21100-===0=-
+1-
+2-=
+1=0=-0
+10011001=0
+2--
+2120=202121
+1=0
+10==-
+22=02102=2-
+11=0-
+1==0-1-1=0
+21===-=-0
+11220-=2-=20=201
+2=001
+1=20--=-
+1===00
+12-22012012-21=
+2=--=20-111=-
+221
+12=0-=-=
+2---102
+1=1
+202011021=
+21=0-0=--1102-1-
+1=--2102220-2==221=
+1=10021-=21
+11=2=202120021-=11
+1-1012=122=
+12-01=0=1=0-11=0--
+100-20=1=-
+110=0-
+1=-102
+2-221=2--010-01
+12-01220
+10--10====1-20=-00
+110
+1=00==22
+212-1-222010=2==2=1
+1=011=1=0
+1-0
+1-11221=000-=200221
+221-00=2=-1-
+122=1=2
+101
+1==2=11=-10
+220-1--=21=2-02==
+21--02--0-==1
+1==0=11012
+122
+1000=20=0012
+22-=0-011110=
+2=21-1-20212--=
+1-=202010
+1-0=-===21-100
+1-22--21
+1-12011122=02=-21
+1-01-2=1000-01=21-
+12-1-1=1=-=01=-1=
+202
+1==-1-00
+1201--=-=-
+1=-1--==1122=2=12
+201020
+1=-11-0111-00-2
+10==1==-1=2
+120=1002-00122
+1=12
+2122110
+1112-10=12==
+1=02--0-=
+2-0021-==112=10=
+2212-022-==10==
+1001200-1-=
+2=000-=00--11
+1==0122120
+1=1==-=2210-
+1-02===012
+12-21-11-1-10
+2=10==-=11=-
+22---2=2012-22100
+1=-0=--
+1=20--2=1212===12=
+1=
+2-
+1-=2=2-00211-2=0
+1=222---02=00211-
+112==10
+2-0=101-10=02
+11212101-
+10-=
+1=01=2=011=--0
+21=0-10==22-201
+1-20=-1=121-
+120=
+1-=01=-1-
+11--1-11=0=221
+1-=120==
+20--002=
+12--22
+200-=
+1=1--21=111=--=011-1
+12011=0=--11
+1-2
+121==1
+10220-==-