Day 25 rust

Author: OrangeBacon

data/day25.txt

@@ -0,0 +1,2 @@
+8987316
+14681524

src/days/day25.rs

@@ -0,0 +1,35 @@
+use anyhow::Result;
+use libaoc::{aoc, AocResult, Timer};
+
+fn trans(subject: usize, loop_size: usize) -> usize {
+    let mut value = 1;
+    for _ in 0..loop_size {
+        value *= subject;
+        value %= 20201227;
+    }
+    value
+}
+
+#[aoc("15217943", "")]
+pub fn solve(timer: &mut Timer, input: &str) -> Result<AocResult> {
+    let input: Vec<usize> = input.lines().map(|x|x.parse().unwrap()).collect();
+    timer.lap("Parse");
+
+    let mut card_loop = 0;
+    let mut value = 1;
+    while value != input[0] {
+        value *= 7;
+        value %= 20201227;
+        card_loop += 1;
+    }
+
+    let part1 = trans(input[1], card_loop);
+
+
+    timer.lap("Part 1");
+
+
+    timer.lap("Part 2");
+
+    Ok(AocResult::new(part1, ""))
+}

src/days/mod.rs

@@ -22,3 +22,4 @@ mod day21;
 mod day22;
 mod day23;
 mod day24;
+mod day25;