Solution for 2025-1, in rust

2025/1/deadvey/src/main.rs

@@ -0,0 +1,48 @@
+use std::fs;
+use std::io;
+use std::time::Instant;
+
+// Right = up/increase
+// Left = down/decrease
+fn main() -> io::Result<()> 
+{
+    let start = Instant::now();
+    let file_contents: String = fs::read_to_string("large.txt")?;
+    let lines: Vec<&str> = file_contents
+        .split("\n")
+        .collect();
+
+    let mut position: i32 = 50;
+    let mut total1: i32 = 0;
+    let mut total2: i32 = 0;
+
+    println!("The dial starts by pointing at {position}");
+
+    for index in 0..&lines.len()-1
+    {
+        let movement = &lines[index][0..1];
+        let mut number: i32 = lines[index][1..lines[index].len()].parse().unwrap();
+
+        if movement == "L" {
+            number = -number
+        };
+        if number < 0 {
+            total2 += (100 - position - number) / 100 - (position == 0) as i32
+        }
+        else {
+            total2 += (number+position) / 100
+        };
+        position = (position + number).rem_euclid(100);
+        if position == 0 {
+            total1 += 1;
+        }
+    }
+
+    let end = start.elapsed();
+    println!("part1: {total1}");
+    println!("part2: {total2}");
+    println!("Took: {:.2?}",end);
+
+
+    Ok(())
+}