From d28cd15ecccea5e123905de524858dea18008ba4 Mon Sep 17 00:00:00 2001
From: Thomas Schmucker <ts@its1.de>
Date: Mon, 11 Nov 2024 18:16:20 +0100
Subject: aoc 2015, day01

---
 2015/src/day01.cpp | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 makefile           |  7 ++++++-
 2 files changed, 60 insertions(+), 1 deletion(-)
 create mode 100644 2015/src/day01.cpp

diff --git a/2015/src/day01.cpp b/2015/src/day01.cpp
new file mode 100644
index 0000000..5d6d482
--- /dev/null
+++ b/2015/src/day01.cpp
@@ -0,0 +1,54 @@
+#include <fstream>
+#include <iostream>
+#include <string>
+
+using namespace std;
+
+string
+read_file(string_view filename)
+{
+	fstream input{ filename };
+	return { istreambuf_iterator<char>{ input }, {} };
+}
+
+void
+part1(string_view puzzle)
+{
+	int floor = 0;
+	for (const auto& chr : puzzle) {
+		if (chr == '(') {
+			++floor;
+		}
+		else if (chr == ')') {
+			--floor;
+		}
+	}
+	cout << floor << endl;
+}
+
+void
+part2(string_view puzzle)
+{
+	int floor = 0;
+	for (string_view::size_type pos = 0; pos != puzzle.length(); ++pos) {
+		const auto chr = puzzle[pos];
+		if (chr == '(') {
+			++floor;
+		}
+		else if (chr == ')') {
+			--floor;
+		}
+		if (floor == -1) {
+			cout << pos+1 << endl;
+			break;
+		}
+	}
+}
+
+int
+main()
+{
+	auto puzzle = read_file("data/day01.txt");
+	part1(puzzle);
+	part2(puzzle);
+}
diff --git a/makefile b/makefile
index 494ced4..d88478f 100644
--- a/makefile
+++ b/makefile
@@ -1,12 +1,17 @@
 include config.mk
 
-all: $(patsubst 2020/src/%.cpp,2020/bin/%,$(wildcard 2020/src/*.cpp)) \
+all: $(patsubst 2015/src/%.cpp,2015/bin/%,$(wildcard 2015/src/*.cpp)) \
+	$(patsubst 2020/src/%.cpp,2020/bin/%,$(wildcard 2020/src/*.cpp)) \
 	$(patsubst 2022/src/%.cpp,2022/bin/%,$(wildcard 2022/src/*.cpp)) \
 	$(patsubst 2023/src/%.cpp,2023/bin/%,$(wildcard 2023/src/*.cpp))
 
 %/bin:
 	mkdir -p $@
 
+# 2015
+2015/bin/%: 2015/src/%.cpp | 2015/bin
+	c++ $(CPPFLAGS) $^ -o $@
+
 # 2020
 2020/bin/%: 2020/src/%.cpp | 2020/bin
 	c++ $(CPPFLAGS) $^ -o $@
-- 
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