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aoc24: day05a complete

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This commit is contained in:
Pratchaya Khansomboon
2024-12-06 12:13:39 +01:00
parent 8df8cbb0e4
commit 5c692fe727
1 changed files with 72 additions and 14 deletions
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86
aoc.cpp
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@@ -4,6 +4,9 @@
#include <expected>
#include <system_error>
#include <ranges>
#include <string>
#include <algorithm>
#include <numeric>
#include "fmt/format.h"
@@ -11,14 +14,13 @@
namespace vfp {
using namespace aoc::types;
using page_order_rule = std::vector<i32>;
class manual_updates {};
using order_rule = std::vector<i32>;
}
auto entry([[maybe_unused]]std::span<char const*> const& args) -> std::expected<void, aoc::error> {
using namespace std::string_view_literals;
auto txtres = aoc::read_text("./dat/24/ex/05.txt");
// auto txtres = aoc::read_text("./dat/24/ex/05.txt");
auto txtres = aoc::read_text("./dat/24/re/05.txt");
if (!txtres) return std::unexpected(txtres.error());
auto const txt = *txtres;
@@ -26,22 +28,78 @@ auto entry([[maybe_unused]]std::span<char const*> const& args) -> std::expected<
auto lines = txt | std::views::split("\n"sv)
| std::views::transform([](auto const& str) { return std::string_view(str); });
auto rules = lines | std::views::take_while(not_empty)
| std::ranges::to<std::vector>();
auto updates = lines | std::views::drop_while(not_empty) | std::views::drop(1)
| std::ranges::to<std::vector>();
auto rules_str = lines | std::views::take_while(not_empty)
| std::ranges::to<std::vector>();
auto updates_str = lines | std::views::drop_while(not_empty)
| std::views::drop(1)
| std::views::take_while(not_empty)
| std::ranges::to<std::vector>();
// fmt::print("rules:\n");
// std::ranges::for_each(rules_str, [](auto const& str) {
// fmt::print(" \"{}\"\n", str);
// });
// fmt::print("\n");
//
// fmt::print("updates:\n");
// std::ranges::for_each(updates_str, [](auto const& str) {
// fmt::print(" \"{}\"\n", str);
// });
fmt::print("rules:\n");
std::ranges::for_each(rules, [](auto const& str) {
fmt::print("{}\n", str);
auto order_rules = rules_str | std::views::transform([](auto const& str) {
return str | std::views::split("|"sv)
| std::views::transform([](auto const& num_str) {
return std::stoi(std::string{std::begin(num_str), std::end(num_str)});
}) | std::ranges::to<std::vector>();
}) | std::ranges::to<std::vector>();
auto updates = updates_str | std::views::transform([](auto const& str) {
return str | std::views::split(","sv)
| std::views::transform([](auto const& num_str) {
return std::stoi(std::string{std::begin(num_str), std::end(num_str)});
}) | std::ranges::to<std::vector>();
}) | std::ranges::to<std::vector>();
// std::ranges::for_each(order_rules, [](auto const& rule) {
// std::ranges::for_each(rule, [](auto const& page) {
// fmt::print("{} ", page);
// });
// fmt::print("\n");
// });
//
// std::ranges::for_each(updates, [](auto const& update) {
// std::ranges::for_each(update, [](auto const& page) {
// fmt::print("{}, ", page);
// });
// fmt::print("\n");
// });
auto valid_updates = updates | std::views::filter([&](auto const& pages) {
return std::ranges::all_of(order_rules, [&](auto const& rule) {
auto const a = std::ranges::find(pages, rule[0]);
auto const b = std::ranges::find(pages, rule[1]);
return a < b || a == std::end(pages) || b == std::end(pages) || a == b;
});
});
fmt::print("updates:\n");
std::ranges::for_each(updates, [](auto const& str) {
fmt::print("{}\n", str);
// std::ranges::for_each(valid_updates, [](auto const& update){
// std::ranges::for_each(update, [](auto const& page) {
// fmt::print("{}, ", page);
// });
// fmt::print("\n");
// });
auto mids = valid_updates | std::views::transform([](auto const& updates) {
return *std::ranges::next(std::begin(updates), updates.size() / 2);
});
// std::ranges::for_each(mids, [](auto const& mid) {
// fmt::print("{}\n", mid);
// });
auto const sum = std::accumulate(std::begin(mids), std::end(mids), 0);
fmt::print("Part A: {}\n", sum);
return {};
}