From 3dc0370ab576388b7fe6908ac73c4561551a494c Mon Sep 17 00:00:00 2001
From: Tom Smeding <tom@tomsmeding.com>
Date: Wed, 1 Dec 2021 19:22:21 +0100
Subject: 2021

---
 2021/.gitignore |   27 +
 2021/1.hs       |   12 +
 2021/1.in       | 2000 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2021/Input.hs   |   20 +
 2021/Makefile   |   47 ++
 2021/Util.hs    |   14 +
 2021/hie.yaml   |    3 +
 7 files changed, 2123 insertions(+)
 create mode 100644 2021/.gitignore
 create mode 100644 2021/1.hs
 create mode 100644 2021/1.in
 create mode 100644 2021/Input.hs
 create mode 100644 2021/Makefile
 create mode 100644 2021/Util.hs
 create mode 100644 2021/hie.yaml

diff --git a/2021/.gitignore b/2021/.gitignore
new file mode 100644
index 0000000..ebbfb2e
--- /dev/null
+++ b/2021/.gitignore
@@ -0,0 +1,27 @@
+obj/
+.depend_hs
+1
+2
+3
+4
+5
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+10
+11
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diff --git a/2021/1.hs b/2021/1.hs
new file mode 100644
index 0000000..84ae3cb
--- /dev/null
+++ b/2021/1.hs
@@ -0,0 +1,12 @@
+module Main where
+
+import Data.List
+
+import Input
+
+
+main :: IO ()
+main = do
+    inp <- map read <$> getInput 1
+    print (sum . map fromEnum . map (> (0::Int)) $ zipWith (-) (tail inp) inp)
+    print (sum . map fromEnum . map (> (0::Int)) . (\x -> zipWith (-) (tail x) x) . map sum . filter ((== 3) . length) . map (take 3) $ tails inp)
diff --git a/2021/1.in b/2021/1.in
new file mode 100644
index 0000000..2c81107
--- /dev/null
+++ b/2021/1.in
@@ -0,0 +1,2000 @@
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diff --git a/2021/Input.hs b/2021/Input.hs
new file mode 100644
index 0000000..afce44e
--- /dev/null
+++ b/2021/Input.hs
@@ -0,0 +1,20 @@
+module Input where
+
+import System.Environment
+import System.IO
+
+
+getInput :: Int -> IO [String]
+getInput day = do
+    let fname = show day ++ ".in"
+
+    args <- getArgs
+    str <- case args of
+        ["-"] -> getContents
+        [] -> readFile fname
+        _ -> do
+            hPutStrLn stderr $ "WARNING: Unrecognised command-line parameters " ++ show args ++
+                               ", reading from " ++ fname
+            readFile fname
+
+    return (lines str)
diff --git a/2021/Makefile b/2021/Makefile
new file mode 100644
index 0000000..7ad280f
--- /dev/null
+++ b/2021/Makefile
@@ -0,0 +1,47 @@
+GHC = ghc
+GHCBASEFLAGS = -package parsec -package array
+GHCFLAGS = $(GHCBASEFLAGS) -Wall -O2 -threaded -fdefer-typed-holes
+CXX = g++
+CXXFLAGS = -Wall -Wextra -std=c++17 -O2
+
+OBJDIR = obj
+
+HASKELL_AUX := Input.hs Util.hs Asm.hs
+CPP_AUX     :=
+HASKELL_SRC := $(filter-out $(HASKELL_AUX),$(wildcard *.hs))
+CPP_SRC     := $(filter-out $(CPP_AUX),$(wildcard *.cpp))
+HASKELL_BIN := $(HASKELL_SRC:.hs=)
+CPP_BIN     := $(CPP_SRC:.cpp=)
+
+BINARIES := $(HASKELL_BIN) $(CPP_BIN)
+
+.PHONY: all clean depend
+
+
+all: $(BINARIES)
+
+clean:
+	rm -f $(BINARIES) .depend_hs
+	rm -rf $(OBJDIR)
+
+# Generate the .depend_hs file for correct Haskell dependency tracking
+depend:
+	ghc -dep-suffix '' -dep-makefile .depend_hs -M $(GHCBASEFLAGS) $(HASKELL_SRC)
+	sed -i 's/\.o *:/:/; s/\.hi$$/.hs/g; s/\.hi[ \t]/.hs/g' .depend_hs
+	rm -f .depend_hs.bak
+
+$(HASKELL_BIN): %: %.hs | $(OBJDIR)/%
+	$(GHC) $(GHCFLAGS) -odir $(OBJDIR)/$* -hidir $(OBJDIR)/$* -o $@ $<
+
+$(CPP_BIN): %: %.cpp $(CPP_AUX) | $(OBJDIR)
+	$(CXX) $(CXXFLAGS) -o $@ $<
+
+$(OBJDIR)/%:
+	mkdir -p $@
+
+
+# By default, if it's needed, just create an empty file (but don't truncate if it exists)
+.depend_hs:
+	touch $@
+
+-include .depend_hs
diff --git a/2021/Util.hs b/2021/Util.hs
new file mode 100644
index 0000000..7cd674d
--- /dev/null
+++ b/2021/Util.hs
@@ -0,0 +1,14 @@
+module Util where
+
+import Data.List
+import Data.List.NonEmpty (NonEmpty(..), (<|))
+
+
+splitOn :: (a -> Bool) -> [a] -> NonEmpty [a]
+splitOn _ [] = [] :| []
+splitOn f (x:xs) | f x = [] <| splitOn f xs
+                 | otherwise = let l :| ls = splitOn f xs
+                               in (x : l) :| ls
+
+splits' :: [a] -> [(a, [a])]
+splits' l = zip l (zipWith (++) (inits l) (tail (tails l)))
diff --git a/2021/hie.yaml b/2021/hie.yaml
new file mode 100644
index 0000000..96da3aa
--- /dev/null
+++ b/2021/hie.yaml
@@ -0,0 +1,3 @@
+cradle:
+  direct:
+    arguments: ["-package", "parsec", "-package", "array", "-Wall", "-i."]
-- 
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