From f4c675a02197ab82b04ceb3f6f40b15f292875a9 Mon Sep 17 00:00:00 2001
From: Alex Karle <alex@alexkarle.com>
Date: Sun, 8 Dec 2024 02:41:00 +0100
Subject: [PATCH] 2023: Finish Day 3

I guess I implemented part one last year and never committed it?
Felt bad having a half completed puzzle, so did it from scratch :)
---
 2023/03/1.go   | 35 -----------------------------------
 2023/03/1.py   | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 2023/03/2.py   | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2023/03/go.mod |  3 ---
 4 files changed, 100 insertions(+), 38 deletions(-)
 delete mode 100644 2023/03/1.go
 create mode 100755 2023/03/1.py
 create mode 100755 2023/03/2.py
 delete mode 100644 2023/03/go.mod

diff --git a/2023/03/1.go b/2023/03/1.go
deleted file mode 100644
index 35799d0..0000000
--- a/2023/03/1.go
+++ /dev/null
@@ -1,35 +0,0 @@
-package main
-
-import (
-	"bufio"
-	"fmt"
-	"log"
-	"os"
-	"strings"
-)
-
-func main() {
-	fname := "input.txt"
-	if len(os.Args) > 1 {
-		fname = os.Args[1]
-	}
-	f, err := os.Open(fname)
-	if err != nil {
-		log.Fatal(err)
-	}
-	defer f.Close()
-
-	grid := [][]string{}
-	scanner := bufio.NewScanner(f)
-	for scanner.Scan() {
-		line := scanner.Text()
-		row := strings.Split(line, "")
-		fmt.Println(row)
-		grid = append(grid, [][]string{row}...)
-	}
-	fmt.Println(grid[0][0])
-
-	if err := scanner.Err(); err != nil {
-		log.Fatal(err)
-	}
-}
diff --git a/2023/03/1.py b/2023/03/1.py
new file mode 100755
index 0000000..f18b5d2
--- /dev/null
+++ b/2023/03/1.py
@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+import sys
+
+G = []
+for l in sys.stdin:
+    chars = [c for c in l.strip()]
+    G.append(chars)
+
+def issym(c):
+    return c is not None and c != '.' and not c.isdigit()
+
+def safeget(i, j):
+    if i > 0 and j > 0 and i < len(G) and j < len(G[0]):
+        return G[i][j]
+    return None
+
+def nearsym(i, j):
+    return (
+        issym(safeget(i-1,j-1)) or
+        issym(safeget(i-1,j)) or
+        issym(safeget(i-1,j+1)) or
+        issym(safeget(i,j-1)) or
+        issym(safeget(i,j)) or
+        issym(safeget(i,j+1)) or
+        issym(safeget(i+1,j-1)) or
+        issym(safeget(i+1,j)) or
+        issym(safeget(i+1,j+1))
+    )
+
+tot = 0
+for i in range(len(G)):
+    numstr = ''
+    sym = False
+    for j in range(len(G[0])):
+        if G[i][j].isdigit():
+            numstr += G[i][j]
+            if not sym:
+                sym = nearsym(i, j)
+        else:
+            if numstr and sym:
+                tot += int(numstr)
+            numstr = ''
+            sym = False
+    if numstr and sym:
+        tot += int(numstr)
+
+print(tot)
diff --git a/2023/03/2.py b/2023/03/2.py
new file mode 100755
index 0000000..6048e4a
--- /dev/null
+++ b/2023/03/2.py
@@ -0,0 +1,53 @@
+#!/usr/bin/env python3
+import sys
+from collections import defaultdict
+
+G = []
+for l in sys.stdin:
+    chars = [c for c in l.strip()]
+    G.append(chars)
+
+def safeget(i, j):
+    if i > 0 and j > 0 and i < len(G) and j < len(G[0]):
+        return G[i][j]
+    return None
+
+def getgear(i, j):
+    locs = [
+        (i-1,j-1),
+        (i-1,j),
+        (i-1,j+1),
+        (i,j-1),
+        (i,j),
+        (i,j+1),
+        (i+1,j-1),
+        (i+1,j),
+        (i+1,j+1),
+    ]
+    for loc in locs:
+        if safeget(loc[0], loc[1]) == '*':
+            return loc
+    return None
+
+gearnums = defaultdict(list)
+for i in range(len(G)):
+    numstr = ''
+    sym = None
+    for j in range(len(G[0])):
+        if G[i][j].isdigit():
+            numstr += G[i][j]
+            if not sym:
+                sym = getgear(i, j)
+        else:
+            if numstr and sym:
+                gearnums[sym].append(int(numstr))
+            numstr = ''
+            sym = None
+    if numstr and sym:
+        gearnums[sym].append(int(numstr))
+
+tot = 0
+for gear in gearnums:
+    if len(gearnums[gear]) == 2:
+        tot += gearnums[gear][0] * gearnums[gear][1]
+print(tot)
diff --git a/2023/03/go.mod b/2023/03/go.mod
deleted file mode 100644
index 995d061..0000000
--- a/2023/03/go.mod
+++ /dev/null
@@ -1,3 +0,0 @@
-module alexkarle.com/aoc-2023-d3
-
-go 1.23.1
--
libgit2 1.8.1