Added solutions for 18th day: snailfish arithmetic

1 files changed, 100 insertions, 0 deletions

diff --git a/2021/18/input b/2021/18/input
new file mode 100644
index 0000000..0e53f1b
--- /dev/null
+++ b/2021/18/input
@@ -0,0 +1,100 @@
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