From e3d8709aeac42e5c2658e97fbf0fefaab0443e7c Mon Sep 17 00:00:00 2001
From: Federico Igne <undyamon@disroot.org>
Date: Sat, 9 Dec 2023 11:58:03 +0100
Subject: aoc(2309): Mirage Maintenance

---
 2023/09/Makefile                  | 19 +++++++++++++++++
 2023/09/resources/input_small.txt |  3 +++
 2023/09/src/part1.cpp             | 43 +++++++++++++++++++++++++++++++++++++
 2023/09/src/part2.cpp             | 45 +++++++++++++++++++++++++++++++++++++++
 4 files changed, 110 insertions(+)
 create mode 100644 2023/09/Makefile
 create mode 100644 2023/09/resources/input_small.txt
 create mode 100644 2023/09/src/part1.cpp
 create mode 100644 2023/09/src/part2.cpp

(limited to '2023')

diff --git a/2023/09/Makefile b/2023/09/Makefile
new file mode 100644
index 0000000..af6a294
--- /dev/null
+++ b/2023/09/Makefile
@@ -0,0 +1,19 @@
+CXXFLAGS := -std=c++17
+CPPFLAGS := -I../include
+EXE := part1 part2
+
+.PHONY: all clean configure
+
+all: $(EXE)
+
+configure:
+	bear -- $(MAKE) all
+
+%.o: %.cpp
+	$(CXX) -c $(CPPFLAGS) $(CXXFLAGS) $< -o $@
+
+clean:
+	rm -rf $(EXE) src/*.o compile_commands.json
+
+%: src/%.o
+	$(CXX) $^ -o $@
diff --git a/2023/09/resources/input_small.txt b/2023/09/resources/input_small.txt
new file mode 100644
index 0000000..539a763
--- /dev/null
+++ b/2023/09/resources/input_small.txt
@@ -0,0 +1,3 @@
+0 3 6 9 12 15
+1 3 6 10 15 21
+10 13 16 21 30 45
diff --git a/2023/09/src/part1.cpp b/2023/09/src/part1.cpp
new file mode 100644
index 0000000..4087486
--- /dev/null
+++ b/2023/09/src/part1.cpp
@@ -0,0 +1,43 @@
+#include <fstream>
+#include <iostream>
+#include <sstream>
+#include <vector>
+
+void solve(std::vector<int> v, int& answer)
+{
+    for (int a = v.size() - 1; a > 0; --a)
+    {
+        answer += v[a];
+        for (int b = 0; b < a; ++b)
+        {
+            v[b] = v[b+1] - v[b];
+        }
+    }
+}
+
+int main(int argc, char* argv[])
+{
+    int answer{};
+
+    std::ifstream input{ argv[1] };
+    if (input.is_open())
+    {
+        std::string line;
+        while (not std::getline(input,line).eof())
+        {
+            int n;
+            std::vector<int> v{};
+            std::istringstream sline{ line };
+            while(sline >> n)
+            {
+                v.push_back(n);
+            }
+
+            solve(std::move(v), answer);
+        }
+    }
+    input.close();
+
+    std::cout << answer << std::endl;
+    return 0;
+}
diff --git a/2023/09/src/part2.cpp b/2023/09/src/part2.cpp
new file mode 100644
index 0000000..df1ec5a
--- /dev/null
+++ b/2023/09/src/part2.cpp
@@ -0,0 +1,45 @@
+#include <numeric>
+#include <fstream>
+#include <iostream>
+#include <sstream>
+#include <vector>
+
+void solve(std::vector<int> v, int& answer)
+{
+    for (int a = 0; a < v.size() - 1; ++a)
+    {
+        answer += v[a];
+        for (int b = v.size() - 1; b > a; --b)
+        {
+            v[b] = v[b-1] - v[b];
+        }
+    }
+}
+
+int main(int argc, char* argv[])
+{
+    int answer{};
+
+    std::ifstream input{ argv[1] };
+    if (input.is_open())
+    {
+        std::string line;
+        while (not std::getline(input,line).eof())
+        {
+            int n;
+            std::vector<int> v{};
+            std::istringstream sline{ line };
+            while(sline >> n)
+            {
+                v.push_back(n);
+            }
+
+            solve(std::move(v), answer);
+        }
+    }
+    input.close();
+
+    std::cout << answer << std::endl;
+    return 0;
+}
+
-- 
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