From bce1acab9034b1b9af4de804839c70b9552f5078 Mon Sep 17 00:00:00 2001
From: Dorje Gilfillan <dorjegilfillan@gmail.com>
Date: Mon, 16 Dec 2024 17:48:45 +0200
Subject: [PATCH] just be boring

---
 src/day15.rs | 18 ++----------------
 1 file changed, 2 insertions(+), 16 deletions(-)

diff --git a/src/day15.rs b/src/day15.rs
index 924e76d..1eebf32 100644
--- a/src/day15.rs
+++ b/src/day15.rs
@@ -1,9 +1,6 @@
 #![allow(clippy::cast_possible_truncation)]
 
-use std::{
-    hint::unreachable_unchecked,
-    simd::{cmp::SimdPartialEq, u8x64, Simd},
-};
+use std::hint::unreachable_unchecked;
 
 use bstr::ByteSlice;
 
@@ -38,18 +35,7 @@ unsafe fn part1_inner(input: &[u8]) -> usize {
         }
         i += 1;
     }
-    let mut result = 0;
-    for i in 0..50 {
-        let line = u8x64::load_or_default(grid.get_unchecked(i * 51..));
-        let mut mask = line.simd_eq(Simd::splat(b'O')).to_bitmask();
-        mask &= (1 << 50) - 1;
-        while mask > 0 {
-            let j = mask.trailing_zeros() as usize;
-            result += 100 * i + j;
-            mask &= mask - 1;
-        }
-    }
-    result
+    grid.find_iter(b"O").map(|pos| 100 * (pos / 51) + pos % 51).sum()
 }
 
 pub fn part2(input: &str) -> usize {