From b4f9e56227819fa4950df99ba6b1ef1bf7ed4d25 Mon Sep 17 00:00:00 2001
From: Max Nuding <max.nuding@icloud.com>
Date: Thu, 8 Dec 2022 07:38:37 +0000
Subject: [PATCH] Parse numbers once and save to grid

---
 src/day08/mod.rs | 66 +++++++++++++++++++++++++-----------------------
 1 file changed, 35 insertions(+), 31 deletions(-)

diff --git a/src/day08/mod.rs b/src/day08/mod.rs
index 3191706..85c8c55 100644
--- a/src/day08/mod.rs
+++ b/src/day08/mod.rs
@@ -1,72 +1,76 @@
 use crate::read;
 
 pub fn run() {
-    let input = read("08");
-    let lines = input.lines().collect::<Vec<_>>();
+    let grid: Vec<Vec<u32>> = read("08")
+        .lines()
+        .map(|l| {
+            l.chars()
+                .map(|c| c.to_digit(10).unwrap())
+                .collect::<Vec<_>>()
+        })
+        .collect::<Vec<_>>();
+
+    let width = grid.first().unwrap().len();
     let mut count = 0;
     let mut max_score = 0;
 
-    for r in 1..lines.len() - 1 {
-        let row = lines[r];
-        for c in 1..row.len() - 1 {
-            let height = row[c..=c].parse().unwrap();
-
-            let mut is_visible = 4;
+    for (row, row_vec) in grid.iter().enumerate().skip(1) {
+        for (col, height) in row_vec.iter().enumerate().skip(1) {
+            let mut sides_visible = 4;
             let mut score = 1;
 
-            score *= if let Some(sc_score) = (0..c)
+            score *= if let Some(sc_score) = (0..col)
                 .rev()
-                .map(|cc| (c - cc, row[cc..=cc].parse::<usize>().unwrap()))
-                .find(|(_sc_score, other_height)| other_height >= &height)
+                .map(|cc| (col - cc, row_vec[cc]))
+                .find(|(_sc_score, other_height)| other_height >= height)
             {
-                is_visible -= 1;
+                sides_visible -= 1;
                 sc_score.0
             } else {
-                c
+                col
             };
 
-            score *= if let Some(sc_score) = (c + 1..row.len())
-                .map(|cc| (cc - c, row[cc..=cc].parse::<usize>().unwrap()))
-                .find(|(_sc_score, other_height)| other_height >= &height)
+            score *= if let Some(sc_score) = (col + 1..width)
+                .map(|cc| (cc - col, row_vec[cc]))
+                .find(|(_sc_score, other_height)| other_height >= height)
             {
-                is_visible -= 1;
+                sides_visible -= 1;
                 sc_score.0
             } else {
-                row.len() - c - 1
+                width - col - 1
             };
 
-            score *= if let Some(sc_score) = (0..r)
+            score *= if let Some(sc_score) = (0..row)
                 .rev()
-                .map(|rr| (r - rr, lines[rr][c..=c].parse::<usize>().unwrap()))
-                .find(|(_sc_score, other_height)| other_height >= &height)
+                .map(|rr| (row - rr, grid[rr][col]))
+                .find(|(_sc_score, other_height)| other_height >= height)
             {
-                is_visible -= 1;
+                sides_visible -= 1;
                 sc_score.0
             } else {
-                r
+                row
             };
 
-            score *= if let Some(sc_score) = lines
+            score *= if let Some(sc_score) = grid
                 .iter()
                 .enumerate()
-                .skip(r + 1)
-                .map(|(rr, l)| (rr - r, l[c..=c].parse::<usize>().unwrap()))
-                .find(|(_sc_score, other_height)| other_height >= &height)
+                .skip(row + 1)
+                .map(|(rr, l)| (rr - row, l[col]))
+                .find(|(_sc_score, other_height)| other_height >= height)
             {
-                is_visible -= 1;
+                sides_visible -= 1;
                 sc_score.0
             } else {
-                lines.len() - r - 1
+                grid.len() - row - 1
             };
 
             max_score = max_score.max(score);
 
-            if is_visible > 0 {
+            if sides_visible > 0 {
                 count += 1;
             }
         }
     }
-    count += 2 * lines.len() + 2 * (lines[0].len() - 2);
 
     #[cfg(feature = "part1")]
     {