diff --git a/day1/Cargo.lock b/day1/Cargo.lock
new file mode 100644
index 0000000..6bcbded
--- /dev/null
+++ b/day1/Cargo.lock
@@ -0,0 +1,14 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day1"
+version = "0.1.0"
+dependencies = [
+ "linebuffer",
+]
+
+[[package]]
+name = "linebuffer"
+version = "0.1.0"
diff --git a/day1/Cargo.toml b/day1/Cargo.toml
new file mode 100644
index 0000000..b0e84d3
--- /dev/null
+++ b/day1/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "day1"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+linebuffer = { path = "/home/avril/work/linebuffer" }
diff --git a/day1/Makefile b/day1/Makefile
deleted file mode 100644
index 05e8118..0000000
--- a/day1/Makefile
+++ /dev/null
@@ -1,117 +0,0 @@
-# Generic C and C++ Makefile project template
-# Contains targets for `release', `debug', and `clean'.
-
-PROJECT=day1
-AUTHOR=Avril (Flanchan) <flanchan@cumallover.me>
-VERSION=0.0.0
-
-SRC_C   = $(wildcard src/*.c)
-SRC_CXX = $(wildcard src/*.cpp)
-
-INCLUDE=include
-
-# Link to these libraries dynamicalls
-SHARED_LIBS= 
-# Link to these libraries statically
-STATIC_LIBS= 
-
-override __VERSION_SPLIT:= $(subst ., ,$(VERSION))
-override __VERSION_REVISION:=$(word 3,$(__VERSION_SPLIT)) 0
-override __VERSION_SPLIT:= MAJOR:$(word 1,$(__VERSION_SPLIT)) MINOR:$(word 2,$(__VERSION_SPLIT)) BUGFIX:$(word 1,$(subst r, ,$(__VERSION_REVISION))) REVISION:$(word 2,$(subst r, ,$(__VERSION_REVISION))) REVISION_STRING:$(word 3,$(__VERSION_SPLIT))
-
-COMMON_FLAGS+= -W -Wall -Wstrict-aliasing -fno-strict-aliasing $(addprefix -I,$(INCLUDE))
-COMMON_FLAGS+= $(addprefix -D_VERSION_,$(subst :,=,$(__VERSION_SPLIT))) '-D_VERSION="$(VERSION)"'
-
-# Target arch. Set to blank for generic
-ARCH?=native
-# Enable OpenMP and loop parallelisation? (dyn-links to openmp)
-PARALLEL?=yes
-
-OPT_FLAGS?= -fgraphite \
-	    -floop-interchange -ftree-loop-distribution -floop-strip-mine -floop-block \
-	    -fno-stack-check
-
-ifneq ($(ARCH),)
-	OPT_FLAGS+= $(addprefix -march=,$(ARCH))
-endif
-
-ifeq ($(PARALLEL),yes)
-	OPT_FLAGS+= -fopenmp -floop-parallelize-all -ftree-parallelize-loops=4
-endif
-
-CXX_OPT_FLAGS?= $(OPT_FLAGS) -felide-constructors
-
-CSTD?=gnu2x
-CXXSTD?=gnu++23
-
-CFLAGS   += $(COMMON_FLAGS) --std=$(CSTD)
-CXXFLAGS += $(COMMON_FLAGS) --std=$(CXXSTD)
-LDFLAGS  += $(addsuffix .a,$(addprefix -l:lib,$(STATIC_LIBS))) $(addprefix -l,$(SHARED_LIBS))
-
-
-STRIP=strip
-
-RELEASE_COMMON_FLAGS+= -fno-bounds-check
-DEBUG_COMMON_FLAGS+= -ggdb -gz -fanalyzer -ftrapv -fbounds-check
-
-ifneq ($(TARGET_SPEC_FLAGS),no)
-	RELEASE_CFLAGS?=   -O3 -flto $(OPT_FLAGS)
-	RELEASE_CXXFLAGS?= -O3 -flto $(CXX_OPT_FLAGS)
-	RELEASE_LDFLAGS?=  -Wl,-O3 -Wl,-flto
-
-	DEBUG_CFLAGS?= -Og	
-	DEBUG_CXXFLAGS?= -Og
-
-	DEBUG_LDFLAGS?=
-endif
-
-DEBUG_CFLAGS+=-DDEBUG $(DEBUG_COMMON_FLAGS)
-DEBUG_CXXFLAGS+=-DDEBUG $(DEBUG_COMMON_FLAGS) -fasynchronous-unwind-tables
-
-RELEASE_CFLAGS+=-DRELEASE $(RELEASE_COMMON_FLAGS)
-RELEASE_CXXFLAGS+=-DRELEASE $(RELEASE_COMMON_FLAGS)
-
-# Objects
-
-OBJ_C   = $(addprefix obj/c/,$(SRC_C:.c=.o))
-OBJ_CXX = $(addprefix obj/cxx/,$(SRC_CXX:.cpp=.o))
-OBJ = $(OBJ_C) $(OBJ_CXX)
-
-# Phonies
-
-.PHONY: release
-release: | dirs $(PROJECT)-release
-
-.PHONY: debug
-debug: | dirs $(PROJECT)-debug
-
-# Targets
-
-dirs:
-	@mkdir -p obj/c{,xx}/src
-
-obj/c/%.o: %.c
-	$(CC) -c $< $(CFLAGS) -o $@ $(LDFLAGS)
-
-obj/cxx/%.o: %.cpp
-	$(CXX) -c $< $(CXXFLAGS) -o $@ $(LDFLAGS)
-
-$(PROJECT)-release: CFLAGS+= $(RELEASE_CFLAGS)
-$(PROJECT)-release: CXXFLAGS += $(RELEASE_CXXFLAGS)
-$(PROJECT)-release: LDFLAGS += $(RELEASE_LDFLAGS)
-$(PROJECT)-release: $(OBJ)
-	$(CXX) $^ $(CXXFLAGS) -o $@ $(LDFLAGS)
-	$(STRIP) $@
-
-$(PROJECT)-debug: CFLAGS+= $(DEBUG_CFLAGS)
-$(PROJECT)-debug: CXXFLAGS += $(DEBUG_CXXFLAGS)
-$(PROJECT)-debug: LDFLAGS += $(DEBUG_LDFLAGS)
-$(PROJECT)-debug: $(OBJ)
-	$(CXX) $^ $(CXXFLAGS) -o $@ $(LDFLAGS)
-
-clean-rebuild:
-	rm -rf obj
-
-clean: clean-rebuild
-	rm -f $(PROJECT)-{release,debug,pgo}
-
diff --git a/day1/include/input.h b/day1/include/input.h
deleted file mode 100644
index cf88304..0000000
--- a/day1/include/input.h
+++ /dev/null
@@ -1,2245 +0,0 @@
-constexpr const size_t INPUT[] = {
-	2936,
-	2154,
-	1578,
-	4820,
-	5674,
-	5582,
-	2392,
-	6148,
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-	0,
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-	10546,
-	0,
-	1036,
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-	2244,
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-	2660,
-	4411,
-	1118,
-	6887,
-	0,
-	3965,
-	3978,
-	3991,
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-	3150,
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-	5310,
-	1991,
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-	0,
-	8526,
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-	4983,
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-	3471,
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-	7198,
-	3127,
-	5522,
-	0,
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-	2219,
-	5174,
-	2873,
-	1650,
-	3044,
-	6290,
-	2640,
-	5499,
-	0,
-	1946,
-	3463,
-	7792,
-	6268,
-	2608,
-	5922,
-	3812,
-	2292,
-	5730,
-	5798,
-	2785,
-	0,
-	15448,
-	14133,
-	15280,
-	0,
-	32925,
-	9977,
-	0,
-	31033,
-	36925,
-	0,
-	7793,
-	4374,
-	3042,
-	3900,
-	7160,
-	7472,
-	6251,
-	1866,
-	7489,
-	0,
-	6884,
-	7643,
-	3926,
-	3857,
-	3326,
-	7619,
-	2831,
-	8489,
-	8212,
-	0,
-	8447,
-	1468,
-	1100,
-	6492,
-	9151,
-	2144,
-	6579,
-	1951,
-	9223,
-	0,
-	28622,
-	0,
-	4166,
-	2686,
-	7394,
-	2773,
-	5777,
-	5734,
-	1164,
-	1916,
-	4040,
-	7119,
-	1986,
-	5178,
-	0,
-	3920,
-	11406,
-	1982,
-	1596,
-	2852,
-	9750,
-	5758,
-	0,
-	4860,
-	10579,
-	5897,
-	9117,
-	2767,
-	10259,
-	8488,
-	1120,
-	0,
-	11037,
-	16409,
-	0,
-	3114,
-	5793,
-	9778,
-	5873,
-	4201,
-	11491,
-	3555,
-	0,
-	1793,
-	9922,
-	21194,
-	0,
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-	4623,
-	4349,
-	5554,
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-	6099,
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-	0,
-	18520,
-	22405,
-	22499,
-	0,
-	3978,
-	20163,
-	16656,
-	0,
-	4073,
-	4198,
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-	5691,
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-	7596,
-	5628,
-	7557,
-	6776,
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-	0,
-	10611,
-	1321,
-	2692,
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-	3168,
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-	2094,
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-	6120,
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-	5493,
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-	0,
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-	4862,
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-	3692,
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-	1491,
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-	9599,
-	0,
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-	1239,
-	0,
-	61041,
-	0,
-	59008,
-	0,
-	6746,
-	5100,
-	2503,
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-	6322,
-	1982,
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-	0,
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-	6586,
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-	8733,
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-	5132,
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-	0,
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-	11293,
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-	4002,
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-	6528,
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-	0,
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-	7737,
-	0,
-	9223,
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-	0,
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-	8692,
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-	23253,
-	0,
-	3418,
-	3116,
-	5056,
-	1656,
-	5994,
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-	4612,
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-	4666,
-	1343,
-	5492,
-	0,
-	3910,
-	4692,
-	1113,
-	1799,
-	5139,
-	3531,
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-	4609,
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-	0,
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-	2197,
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-	4953,
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-	2660,
-	0,
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-	0,
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-	0,
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-	3996,
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-	1656,
-	24309,
-	0,
-	3801,
-	5855,
-	2015,
-	2516,
-	1313,
-	3658,
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-	2769,
-	3269,
-	3797,
-	6851,
-	7192,
-	0,
-	1254,
-	1999,
-	3039,
-	5211,
-	2624,
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-	3214,
-	6949,
-	7036,
-	7926,
-	2469,
-	0,
-	17404,
-	21131,
-	13342,
-	0,
-	3789,
-	5360,
-	2709,
-	4535,
-	5734,
-	5686,
-	3180,
-	1711,
-	1719,
-	3476,
-	1747,
-	3526,
-	3642,
-	3528,
-	2035,
-	0,
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-	0,
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-	0,
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-	1225,
-	4862,
-	4154,
-	3311,
-	4597,
-	4483,
-	5029,
-	2931,
-	3724,
-	6267,
-	0,
-	5105,
-	2285,
-	3247,
-	1997,
-	7380,
-	2619,
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-	1492,
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-	0,
-	2372,
-	9012,
-	3114,
-	6193,
-	9829,
-	7515,
-	0,
-	2994,
-	2886,
-	7307,
-	6672,
-	9188,
-	6452,
-	7227,
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-	2683,
-	4863,
-	6494,
-	2116,
-	2334,
-	2428,
-	3922,
-	5454,
-	4604,
-	0,
-	7695,
-	2885,
-	4466,
-	5049,
-	8098,
-	4177,
-	6464,
-	7981,
-	3183,
-	3346,
-	0,
-	5863,
-	3390,
-	10072,
-	4163,
-	9577,
-	6662,
-	5975,
-	8122,
-	0,
-	1443,
-	4466,
-	7142,
-	6107,
-	1032,
-	3545,
-	4362,
-	8074,
-	1339,
-	2477,
-	1322,
-	0,
-	1912,
-	14613,
-	15225,
-	16363,
-	0,
-	4119,
-	1645,
-	8059,
-	7384,
-	5633,
-	11876,
-	5144,
-	0,
-	2886,
-	7293,
-	17062,
-	0,
-	1344,
-	5571,
-	6367,
-	2730,
-	1134,
-	5853,
-	4098,
-	6827,
-	1283,
-	1437,
-	6932,
-	3271,
-	0,
-	3847,
-	1889,
-	6732,
-	1468,
-	1087,
-	3477,
-	5090,
-	3164,
-	5436,
-	6696,
-	0,
-	11985,
-	4877,
-	12181,
-	3096,
-	7222,
-	0,
-	12716,
-	11377,
-	11278,
-	1601,
-	0,
-	5418,
-	11900,
-	5334,
-	8971,
-	10651,
-	7907,
-	11469,
-	0,
-	6907,
-	7969,
-	2738,
-	3250,
-	4497,
-	5563,
-	2339,
-	7091,
-	2032,
-	0,
-	1092,
-	8088,
-	6222,
-	8095,
-	6713,
-	3648,
-	2551,
-	1956,
-	3413,
-	8164,
-	0,
-	6511,
-	6142,
-	4365,
-	4237,
-	6568,
-	1832,
-	5450,
-	3012,
-	3588,
-	2699,
-	4931,
-	0,
-	32059,
-	19019,
-	0,
-	2627,
-	8198,
-	10858,
-	11115,
-	1648,
-	2383,
-	0,
-	9821,
-	7551,
-	1459,
-	6217,
-	10094,
-	1445,
-	9978,
-	0,
-};
diff --git a/day1/input.sh b/day1/input.sh
deleted file mode 100755
index df3f87a..0000000
--- a/day1/input.sh
+++ /dev/null
@@ -1,12 +0,0 @@
-#!/bin/bash
-
-echo "constexpr size_t INPUT[] = {"
-while IFS= read -r line; do
-	if [[ -z "$line" ]]; then
-		echo "	0,"
-	else
-		echo "	${line},"
-	fi
-done
-echo "	0,";
-echo "};";
diff --git a/day1/src/main.cpp b/day1/src/main.cpp
deleted file mode 100644
index fc89390..0000000
--- a/day1/src/main.cpp
+++ /dev/null
@@ -1,62 +0,0 @@
-
-#include <string>
-#include <vector>
-#include <optional>
-#include <memory>
-
-#include <cstdio>
-#include <cstdlib>
-#include <cstring>
-#include <cstdint>
-
-#include <input.h>
-
-class  [[gnu::visibility("hidden")]] Elf  {
-	std::vector<size_t> _lines;
-public:
-	Elf() = default;
-	Elf(Elf const&) = default;
-	Elf(Elf&&) = default;
-	Elf& operator=(Elf&&) = default;
-	Elf& operator=(Elf const&) = default;
-	~Elf() = default;
-
-	using ptr_t = decltype(INPUT)*;
-
-	template<size_t N>
-	static std::unique_ptr<Elf> read_from_input(const ptr_t (&input)[N])
-	{
-		Elf elf;
-		size_t n=0;
-		for(;n = **input;(*input)++) elf._lines.push_back(n);
-		if(n)
-			return std::make_unique<Elf>(std::move(elf));
-		else
-			return nullptr;
-	}
-
-	size_t sum() const noexcept
-	{
-		size_t s =0;
-		for(size_t sz : _lines) s+=sz;
-		return s;
-	}
-};
-
-static std::unique_ptr<Elf> read_elf()
-{
-	constinit static const auto input = INPUT;
-	return Elf::read_from_input(&input);
-}
-
-int main() {
-	size_t max;
-	std::unique_ptr<Elf> e;
-	while(e = read_elf()) {
-		auto sum = e->sum();
-		if(sum>max) max = sum;
-	}
-	printf("%lu\n", max);
-	
-	return 0;
-}
diff --git a/day1/src/main.rs b/day1/src/main.rs
new file mode 100644
index 0000000..ac6aa43
--- /dev/null
+++ b/day1/src/main.rs
@@ -0,0 +1,50 @@
+use linebuffer::{
+    buf::forward,
+    ParsedLines,
+};
+use std::{
+    io,
+    str,
+    fs,
+};
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Default, Copy)]
+struct MaybeU64(Option<u64>);
+
+impl str::FromStr for MaybeU64
+{
+    type Err = <u64 as str::FromStr>::Err;
+
+    #[inline] 
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+	if s.is_empty() {
+	    Ok(Self(None))
+	} else {
+	    Ok(Self(Some(s.parse()?)))
+	}
+    }
+}
+
+fn input_reader<R: io::Read>(input: R) -> ParsedLines<R, forward::FromStr<MaybeU64>>
+{
+    ParsedLines::new(input)
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error+ 'static>> {
+    let mut reader = input_reader(fs::OpenOptions::new().read(true).open("input")?);
+    
+    let mut last_elf = 0;
+    let mut max_elf = 0;
+    while let Some(res) = reader.try_next()
+    {
+	match res.expect("Failed to parse line").0 {
+	    Some(value) => last_elf += value,
+	    None if last_elf > max_elf => {
+		max_elf = std::mem::replace(&mut last_elf, 0);
+	    },
+	    _ => last_elf = 0,
+	}
+    }
+    println!("{}", std::cmp::max(max_elf, last_elf));
+    Ok(())
+}