multithread

2023/16/Cargo.toml

@@ -2,7 +2,14 @@
 name = "sixteenth"
 version = "0.1.0"
 edition = "2021"
-
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+
+[profile.release]
+opt-level = 3
+
+[target.x86_64-unknown-linux-gnu]
+rustflags = [
+    "-C", "target-feature=+crt-static"
+]

2023/16/src/main.rs

@@ -1,4 +1,4 @@
-use std::{fs::File, io::{BufReader, BufRead, Write}, ops::Add, fmt::Debug, hash::Hasher};
+use std::{fs::File, io::{BufReader, BufRead, Write}, ops::Add, fmt::Debug, hash::Hasher, sync::Arc};
 
 fn main() {
     part1();
@@ -294,8 +294,15 @@ fn part1() {
 
 fn part2() {
     let (max_point, rows, columns) = setup();
-    let mut count = 0;
+    let mut threads = Vec::with_capacity(4);
+    let rows = Arc::new(rows);
+    let columns = Arc::new(columns);
     for vector in [VEC_LEFT, VEC_RIGHT, VEC_UP, VEC_DOWN] {
+        let rows = rows.clone();
+        let columns = columns.clone();
+        threads.push(
+            std::thread::spawn(move || {
+                let mut count = 0;
                 let is_vert = vector.is_vertical();
                 let is_pos = vector.is_positive();
                 let num2 = if !is_pos { max_point.x - 1 } else { 0 };
@@ -310,6 +317,16 @@ fn part2() {
                         println!("New max: {} at {},{}", count, num, num2);
                     }
                 }
+                count
+            })
+        )
+    }
+    let mut count = 0;
+    for thread in threads {
+        let count_here = thread.join().unwrap();
+        if count_here > count {
+            count = count_here;
+        }
     }
     println!("Max count: {}", count);
 }