day1 part1

Fortune for day1's current commit: Blessing − 吉

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"

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" }

day1/Makefile

@@ -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}
-

day1/input.sh

@@ -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 "};";

day1/src/main.cpp

@@ -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;
-}

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(())
+}