OPTIMATIONS

Days/One/OnePart2/Cargo.toml

@@ -4,3 +4,8 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+
+[profile.release]
+codegen-units = 1
+lto = "fat"
+panic = "abort"

Days/One/OnePart2/config.toml

@@ -0,0 +1,2 @@
+[build]
+rustflags = ["-C", "target-cpu=native"]

Days/One/OnePart2/src/main.rs

@@ -100,21 +100,29 @@ use std::fs::File;
 use std::io::{BufRead, BufReader};
 use std::path::Path;
 
-fn compute(mut left: Vec<i64>, mut right: Vec<i64>) -> i64 {
-    left.iter().fold(0, |sum, left_item| sum + (left_item * (right.iter().fold(0, |count, right_item| count + (left_item == right_item) as i64))))
+// fn compute(mut left: Vec<i32>, mut right: Vec<i32>) -> i32 {
+//     left.iter().fold(0, |sum, left_item| sum + (left_item * (right.iter().filter(|&n| n == left_item).count() as i32)))
+// }
+
+fn compute(mut left: Vec<i32>, mut right: Vec<i32>) -> i32 {
+    let mut sum = 0;
+    for left_item in left.iter() {
+        sum += (left_item * (right.iter().filter(|&n| n == left_item).count() as i32));
+    }
+    sum
 }
 
-fn load_lists() -> (Vec<i64>, Vec<i64>) {
-    let mut left: Vec<i64> = vec![0];
-    let mut right: Vec<i64> = vec![0];
+fn load_lists() -> (Vec<i32>, Vec<i32>) {
+    let mut left: Vec<i32> = vec![0];
+    let mut right: Vec<i32> = vec![0];
     let file = File::open(Path::new("./input")).unwrap();
     let reader = BufReader::new(file);
     for line in reader.lines() {
         let line = line.unwrap();
         let mut split = line.split("   ");
         let collection = split.collect::<Vec<&str>>();
-        left.push(collection[0].parse::<i64>().unwrap());
-        right.push(collection[1].parse::<i64>().unwrap());
+        left.push(collection[0].parse::<i32>().unwrap());
+        right.push(collection[1].parse::<i32>().unwrap());
     }
     (left, right)
 }
@@ -123,7 +131,8 @@ fn main() {
     let (left, right) = load_lists();
     use std::time::Instant;
     let now = Instant::now();
-    println!("{:?}", compute(left, right));
+    let result = compute(left, right);
     let elapsed = now.elapsed();
-    println!("Elapsed: {:?} seconds.", elapsed.as_micros());
+    println!("{:?}", result);
+    println!("Elapsed: {:?} microseconds.", elapsed.as_micros());
 }