From 7a085154e7bc4650446957f270756bb7fdadc4ca Mon Sep 17 00:00:00 2001
From: kageru <kageru@encode.moe>
Date: Thu, 8 Dec 2022 17:43:05 +0100
Subject: [PATCH] rayon go brrrr

---
 2022/Cargo.toml       | 1 +
 2022/src/bin/day08.rs | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/2022/Cargo.toml b/2022/Cargo.toml
index c258814..80d6ede 100644
--- a/2022/Cargo.toml
+++ b/2022/Cargo.toml
@@ -6,6 +6,7 @@ edition = "2021"
 [dependencies]
 itertools = "0.10.5"
 paste = "1.0"
+rayon = "1.6.0"
 
 [profile.bench]
 lto = true
diff --git a/2022/src/bin/day08.rs b/2022/src/bin/day08.rs
index c33dc72..f356a7f 100644
--- a/2022/src/bin/day08.rs
+++ b/2022/src/bin/day08.rs
@@ -1,6 +1,7 @@
 #![feature(test, get_many_mut)]
 extern crate test;
 use itertools::Itertools;
+use rayon::prelude::*;
 use std::iter::repeat;
 
 use aoc2022::{boilerplate, common::*};
@@ -53,7 +54,8 @@ fn part2(parsed: &Parsed) -> usize {
     let size = parsed.len(); // input is always square
     let transposed = transpose(parsed);
     (1..size - 1)
-        .flat_map(|i| repeat(i).zip(1..size - 1))
+        .into_par_iter()
+        .flat_map(|i| rayon::iter::repeat(i).zip(1..size - 1))
         .map(|(i, j)| {
             let tree = parsed[i][j];
             let a = visible_trees(tree, transposed[j][(i + 1)..size].iter());