25 files changed, 72 insertions, 0 deletions
diff --git a/src/2016/day9/README.md b/src/2016/day9/README.md
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/2016/day9/README.md
diff --git a/src/2016/day9/aoc.cpp b/src/2016/day9/aoc.cpp
new file mode 100644
index 0000000..074ae8e
--- /dev/null
+++ b/src/2016/day9/aoc.cpp
@@ -0,0 +1,5 @@
+#include "aoc.h"
+
+namespace aoc {
+
+}
diff --git a/src/2016/day9/aoc.h b/src/2016/day9/aoc.h
new file mode 100644
index 0000000..45dc07c
--- /dev/null
+++ b/src/2016/day9/aoc.h
@@ -0,0 +1,6 @@
+#pragma once
+#include "common.h"
+
+namespace aoc {
+
+}
diff --git a/src/2016/day9/input b/src/2016/day9/input
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/2016/day9/input
diff --git a/src/2017/day9/README.md b/src/2017/day9/README.md
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/2017/day9/README.md
diff --git a/src/2017/day9/aoc.cpp b/src/2017/day9/aoc.cpp
new file mode 100644
index 0000000..074ae8e
--- /dev/null
+++ b/src/2017/day9/aoc.cpp
@@ -0,0 +1,5 @@
+#include "aoc.h"
+
+namespace aoc {
+
+}
diff --git a/src/2017/day9/aoc.h b/src/2017/day9/aoc.h
new file mode 100644
index 0000000..45dc07c
--- /dev/null
+++ b/src/2017/day9/aoc.h
@@ -0,0 +1,6 @@
+#pragma once
+#include "common.h"
+
+namespace aoc {
+
+}
diff --git a/src/2017/day9/input b/src/2017/day9/input
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/2017/day9/input
diff --git a/src/2018/day9/README.md b/src/2018/day9/README.md
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/2018/day9/README.md
diff --git a/src/2018/day9/aoc.cpp b/src/2018/day9/aoc.cpp
new file mode 100644
index 0000000..074ae8e
--- /dev/null
+++ b/src/2018/day9/aoc.cpp
@@ -0,0 +1,5 @@
+#include "aoc.h"
+
+namespace aoc {
+
+}
diff --git a/src/2018/day9/aoc.h b/src/2018/day9/aoc.h
new file mode 100644
index 0000000..45dc07c
--- /dev/null
+++ b/src/2018/day9/aoc.h
@@ -0,0 +1,6 @@
+#pragma once
+#include "common.h"
+
+namespace aoc {
+
+}
diff --git a/src/2018/day9/input b/src/2018/day9/input
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/2018/day9/input
diff --git a/src/2019/day9/README.md b/src/2019/day9/README.md
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/2019/day9/README.md
diff --git a/src/2019/day9/aoc.cpp b/src/2019/day9/aoc.cpp
new file mode 100644
index 0000000..074ae8e
--- /dev/null
+++ b/src/2019/day9/aoc.cpp
@@ -0,0 +1,5 @@
+#include "aoc.h"
+
+namespace aoc {
+
+}
diff --git a/src/2019/day9/aoc.h b/src/2019/day9/aoc.h
new file mode 100644
index 0000000..45dc07c
--- /dev/null
+++ b/src/2019/day9/aoc.h
@@ -0,0 +1,6 @@
+#pragma once
+#include "common.h"
+
+namespace aoc {
+
+}
diff --git a/src/2019/day9/input b/src/2019/day9/input
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/2019/day9/input
diff --git a/src/2020/day9/README.md b/src/2020/day9/README.md
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/2020/day9/README.md
diff --git a/src/2020/day9/aoc.cpp b/src/2020/day9/aoc.cpp
new file mode 100644
index 0000000..074ae8e
--- /dev/null
+++ b/src/2020/day9/aoc.cpp
@@ -0,0 +1,5 @@
+#include "aoc.h"
+
+namespace aoc {
+
+}
diff --git a/src/2020/day9/aoc.h b/src/2020/day9/aoc.h
new file mode 100644
index 0000000..45dc07c
--- /dev/null
+++ b/src/2020/day9/aoc.h
@@ -0,0 +1,6 @@
+#pragma once
+#include "common.h"
+
+namespace aoc {
+
+}
diff --git a/src/2020/day9/input b/src/2020/day9/input
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/2020/day9/input
diff --git a/src/2021/day9/README.md b/src/2021/day9/README.md
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/2021/day9/README.md
diff --git a/src/2021/day9/aoc.cpp b/src/2021/day9/aoc.cpp
new file mode 100644
index 0000000..074ae8e
--- /dev/null
+++ b/src/2021/day9/aoc.cpp
@@ -0,0 +1,5 @@
+#include "aoc.h"
+
+namespace aoc {
+
+}
diff --git a/src/2021/day9/aoc.h b/src/2021/day9/aoc.h
new file mode 100644
index 0000000..45dc07c
--- /dev/null
+++ b/src/2021/day9/aoc.h
@@ -0,0 +1,6 @@
+#pragma once
+#include "common.h"
+
+namespace aoc {
+
+}
diff --git a/src/2021/day9/input b/src/2021/day9/input
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/2021/day9/input
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index da620ac..9958a60 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -30,6 +30,7 @@ set(SOLUTION_FILES
   "2016/day6/aoc.cpp"
   "2016/day7/aoc.cpp"
   "2016/day8/aoc.cpp"
+  "2016/day9/aoc.cpp"
 
   "2017/day1/aoc.cpp"
   "2017/day2/aoc.cpp"
@@ -39,6 +40,7 @@ set(SOLUTION_FILES
   "2017/day6/aoc.cpp"
   "2017/day7/aoc.cpp"
   "2017/day8/aoc.cpp"
+  "2017/day9/aoc.cpp"
 
   "2018/day1/aoc.cpp"
   "2018/day2/aoc.cpp"
@@ -48,6 +50,7 @@ set(SOLUTION_FILES
   "2018/day6/aoc.cpp"
   "2018/day7/aoc.cpp"
   "2018/day8/aoc.cpp"
+  "2018/day9/aoc.cpp"
 
   "2019/day1/aoc.cpp"
   "2019/day2/aoc.cpp"
@@ -57,6 +60,7 @@ set(SOLUTION_FILES
   "2019/day6/aoc.cpp"
   "2019/day7/aoc.cpp"
   "2019/day8/aoc.cpp"
+  "2019/day9/aoc.cpp"
 
   "2020/day1/aoc.cpp"
   "2020/day2/aoc.cpp"
@@ -66,6 +70,7 @@ set(SOLUTION_FILES
   "2020/day6/aoc.cpp"
   "2020/day7/aoc.cpp"
   "2020/day8/aoc.cpp"
+  "2020/day9/aoc.cpp"
 
   "2021/day1/aoc.cpp"
   "2021/day2/aoc.cpp"
@@ -75,6 +80,7 @@ set(SOLUTION_FILES
   "2021/day6/aoc.cpp"
   "2021/day7/aoc.cpp"
   "2021/day8/aoc.cpp"
+  "2021/day9/aoc.cpp"
 )
 
 add_library(solution SHARED ${SOLUTION_FILES})