Add 2023 day 3 part 1 solution

2 files changed, 175 insertions, 0 deletions

diff --git a/2023/03/input b/2023/03/input
new file mode 100644
index 0000000..bc52a0b
--- /dev/null
+++ b/2023/03/input
@@ -0,0 +1,140 @@
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diff --git a/2023/03/puzzle-1.py b/2023/03/puzzle-1.py
new file mode 100755
index 0000000..d078c4d
--- /dev/null
+++ b/2023/03/puzzle-1.py
@@ -0,0 +1,35 @@
+#!/usr/bin/python
+
+import re
+
+
+def main() -> None:
+	with open("input", "r", encoding="utf-8") as f:
+		data = f.read()
+
+	symbols = set()
+	matches = []
+
+	lines = [line for line in data.split('\n') if line]
+	for i, line in enumerate(lines):
+		for match in re.finditer(r'\d+', line):
+			matches.append((i, match))
+		for match in re.finditer(r'[^0-9.]', line):
+			symbols.add((i, match.start()))
+
+	acc = 0
+	for match in matches:
+		l, m = match
+		s, e = m.span()
+		ps = [(l, s-1), (l, e)]
+		for i in range(s-1, e+1):
+			ps.append((l-1, i))
+			ps.append((l+1, i))
+		for p in ps:
+			if p in symbols:
+				acc += int(m.group(0))
+
+	print(acc)
+
+if __name__ == "__main__":
+	main()