2025 day06 p2

Change-Id: I1421c6279597b9cb040dfcafb6984a3730503d10

2025/CMakeLists.txt

@@ -0,0 +1,38 @@
+find_package(fmt REQUIRED)
+find_package(utf8cpp REQUIRED)
+find_package(ctre REQUIRED)
+
+function(add_day_executables)
+    foreach(src IN LISTS ARGN)
+        get_filename_component(name "${src}" NAME_WE)
+
+        add_executable(${name} "${src}")
+
+        target_include_directories(${name} PUBLIC "${PROJECT_SOURCE_DIR}")
+        target_compile_features(${name} PRIVATE cxx_std_23)
+
+        target_link_libraries(${name}
+            PRIVATE
+                ${PLATFORM_LINK_LIBRARIES}
+                fmt
+                utf8cpp
+                ctre
+        )
+
+        target_compile_definitions(${name} PRIVATE ${PLATFORM_DEFINITIONS})
+        target_compile_options(${name} PRIVATE ${BASE_OPTIONS})
+
+        source_group(TREE "${CMAKE_CURRENT_LIST_DIR}" FILES "${src}")
+    endforeach()
+endfunction()
+
+
+add_day_executables(
+    "day01.cpp"
+    "day02.cpp"
+    "day03.cpp"
+    "day04.cpp"
+    "day05.cpp"
+    "day06.cpp"
+    "day07.cpp"
+)

2025/day01.cpp

@@ -0,0 +1,127 @@
+#include <span>
+#include <algorithm>
+#include <ranges>
+#include <string>
+#include <string_view>
+#include <utility>
+#include <vector>
+
+#include "fmt/std.h"
+
+#include "aoc/types.hpp"
+#include "aoc/utils.hpp"
+
+using namespace std::string_view_literals;
+using namespace aoc::types;
+
+// simple pipe for std::string by value
+template <typename F>
+auto operator|(std::string s, F&& f) -> decltype(auto) {
+    return std::forward<F>(f)(std::move(s));
+}
+
+auto ltrim(std::string s) -> std::string {
+    s.erase(
+        std::begin(s),
+        std::find_if(s.begin(), s.end(), [](char ch) {
+            return !std::isspace(static_cast<char>(ch));
+        }));
+    return s;
+}
+
+auto rtrim(std::string s) -> std::string {
+    s.erase(
+        std::find_if(s.rbegin(), s.rend(), [](char ch) {
+            return !std::isspace(static_cast<char>(ch));
+        }).base(),
+        s.end());
+    return s;
+}
+
+auto trim(std::string s) -> std::string {
+    return ltrim(rtrim(std::move(s)));
+}
+
+// starts at 50
+[[maybe_unused]]constexpr auto raw_str = R"(
+L68
+L30
+R48
+L5
+R60
+L55
+L1
+L99
+R14
+L82
+)";
+
+auto map_char_to_rotdir(char c) -> i32 {
+    switch (c) {
+        case 'L': return -1;
+        case 'R':
+        default:  return 1;
+    }
+}
+
+static auto entry([[maybe_unused]]std::span<char const*> const& args) -> void {
+    // std::string str{raw_str};
+    auto str = aoc::read_text("./input.txt").value_or("");
+    str = str | trim;
+
+    auto rot_vec = str | std::views::split("\n"sv) | std::views::transform([](auto const& str) {
+            return i32(std::stoi(std::string{++std::begin(str), std::end(str)})) * map_char_to_rotdir(*std::begin(str));
+        }) | std::ranges::to<std::vector>();
+
+    i32 start = 50;
+    i32 zero_cross = 0;
+    // auto sum = std::ranges::fold_left(rot_vec, 0, [&](auto a, auto t) {
+    //         auto const p = start;
+    //         start = (100 + p - t) % 100;
+    //
+    //         zero_cross += (std::abs((p - t + 1) % 100) + std::abs(t)) / 100;
+    //
+    //         fmt::print("pos: {}, next: {}, t: {}\n", p, start, t);
+    //
+    //         if (start == 0) {
+    //             a += 1;
+    //         }
+    //
+    //         return a;
+    //     });
+
+    auto sum = std::ranges::fold_left(rot_vec, 0, [&](auto a, auto t) {
+            auto const dir = t < 0 ? -1 : 1;
+            auto const steps = std::abs(t);
+
+            for (i32 i = 0; i < steps; ++i) {
+                auto next = start + dir;
+                if (next < 0) next = 99;
+                next = next % 100;
+
+                if (next % 100 == 0)
+                    ++zero_cross;
+
+                start = next;
+            }
+
+            if (start % 100 == 0) {
+                ++a;
+                if (zero_cross > 0)
+                    zero_cross -= 1;
+            }
+            return a;
+        });
+
+    fmt::print("res: {}, {} sum = {}\n", sum, zero_cross, sum + zero_cross);
+}
+
+auto main([[maybe_unused]]int argc, [[maybe_unused]]char const* argv[]) -> int {
+    try {
+        entry({argv, std::next(argv, argc)});
+    } catch (std::exception const& e) {
+        fmt::print(stderr, "{}\n", e.what());
+        return 1;
+    }
+    return 0;
+}

2025/day02.cpp

@@ -0,0 +1,90 @@
+#include <span>
+#include <algorithm>
+#include <ranges>
+#include <string>
+#include <string_view>
+#include <utility>
+#include <vector>
+
+#include "fmt/std.h"
+
+#include "aoc/types.hpp"
+#include "aoc/utils.hpp"
+
+using namespace std::string_view_literals;
+using namespace aoc::types;
+
+// starts at 50
+[[maybe_unused]]constexpr auto raw_str = R"(
+11-22,95-115,998-1012,1188511880-1188511890,222220-222224,
+1698522-1698528,446443-446449,38593856-38593862,565653-565659,
+824824821-824824827,2121212118-2121212124
+)";
+
+static auto entry([[maybe_unused]]std::span<char const*> const& args) -> void {
+    // std::string str{raw_str};
+    auto str = aoc::read_text("./input.txt").value_or("");
+    str = aoc::trim(str);
+
+    auto ids_str = str | std::views::split(","sv) | std::views::transform([](auto const& str) {
+        std::vector<u64> range{};
+        range.resize(2);
+
+        // std::ranges::transform(
+        //     aoc::trim(std::string{std::begin(str), std::end(str)}) | std::views::split("-"sv),
+        //     std::begin(range),
+        //     [](auto const& value) {
+        //         return aoc::trim(std::string{std::begin(value), std::end(value)});
+        //  });
+
+        std::ranges::transform(
+            aoc::trim(std::string{std::begin(str), std::end(str)}) | std::views::split("-"sv),
+            std::begin(range),
+            [](auto const& value) {
+                return u64(std::stoul(aoc::trim(std::string{std::begin(value), std::end(value)})));
+         });
+
+        return range;
+    }) | std::ranges::to<std::vector>();
+
+    auto is_valid_id = [](u64 id) {
+        auto const str = fmt::format("{}", id);
+        if (str.size() % 2 != 0) return true;
+        bool is_invalid = true;
+        for (usize i = 0; i < str.size() / 2; ++i) {
+            if (str[i] != str[str.size() / 2 + i]) {
+                is_invalid = false;
+                continue;
+            }
+        }
+        return !is_invalid;
+    };
+
+    u64 sum = 0;
+
+    for (auto const& id : ids_str) {
+        u64 const start = id[0];
+        u64 const end = id[1];
+
+        fmt::print("{} -> {}: ", id[0], id[1]);
+        for (u64 i = start; i <= end; ++i) {
+            if (!is_valid_id(i)) {
+                fmt::print("{}, ", i);
+                sum += i;
+            }
+        }
+        fmt::print("\n");
+    }
+
+    fmt::print("res: {}\n", sum);
+}
+
+auto main([[maybe_unused]]int argc, [[maybe_unused]]char const* argv[]) -> int {
+    try {
+        entry({argv, std::next(argv, argc)});
+    } catch (std::exception const& e) {
+        fmt::print(stderr, "{}\n", e.what());
+        return 1;
+    }
+    return 0;
+}

2025/day03.cpp

@@ -0,0 +1,73 @@
+#include <span>
+#include <algorithm>
+#include <ranges>
+#include <string>
+#include <string_view>
+#include <utility>
+#include <vector>
+
+#include "fmt/std.h"
+
+#include "aoc/types.hpp"
+#include "aoc/utils.hpp"
+
+using namespace std::string_view_literals;
+using namespace aoc::types;
+
+// starts at 50
+[[maybe_unused]]constexpr auto raw_str = R"(
+987654321111111
+811111111111119
+234234234234278
+818181911112111
+)";
+
+static auto entry([[maybe_unused]]std::span<char const*> const& args) -> void {
+    // std::string str{raw_str};
+    auto str = aoc::read_text("./input.txt").value_or("");
+    str = aoc::trim(str);
+
+    fmt::print("INPUT\n");
+    fmt::print("⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼\n");
+    fmt::print("{}\n", str);
+    fmt::print("{}\n", std::string(80, '-'));
+
+    auto jolts_str = str | std::views::split("\n"sv) | std::views::transform([](auto const& str) {
+        return aoc::trim(std::string{std::begin(str), std::end(str)});
+    }) | std::ranges::to<std::vector>();
+
+
+    std::vector<u64> jolts{};
+    jolts.reserve(jolts_str.size());
+    for (auto const& jolt : jolts_str) {
+        u64 largest = 0;
+        for (usize i = 0; i < jolt.size(); ++i) {
+            for (usize j = i + 1; j < jolt.size(); ++j) {
+                auto const value = std::stoull(fmt::format("{}{}", jolt[i], jolt[j]));
+                if (value > largest) largest = value;
+            }
+        }
+
+        jolts.push_back(largest);
+    }
+
+    for (auto const& jolt : jolts) {
+        fmt::print("{}\n", jolt);
+    }
+
+    auto sum = std::ranges::fold_left(jolts, u64(0), [&](auto a, auto v) {
+        return a + v;
+    });
+
+    fmt::print("res: {}\n", sum);
+}
+
+auto main([[maybe_unused]]int argc, [[maybe_unused]]char const* argv[]) -> int {
+    try {
+        entry({argv, std::next(argv, argc)});
+    } catch (std::exception const& e) {
+        fmt::print(stderr, "{}\n", e.what());
+        return 1;
+    }
+    return 0;
+}

2025/day04.cpp

@@ -0,0 +1,83 @@
+#include <span>
+#include <algorithm>
+#include <ranges>
+#include <string>
+#include <string_view>
+#include <utility>
+#include <vector>
+
+#include "fmt/std.h"
+
+#include "aoc/types.hpp"
+#include "aoc/utils.hpp"
+
+using namespace std::string_view_literals;
+using namespace aoc::types;
+
+// starts at 50
+[[maybe_unused]]constexpr auto raw_str = R"(
+..@@.@@@@.
+@@@.@.@.@@
+@@@@@.@.@@
+@.@@@@..@.
+@@.@@@@.@@
+.@@@@@@@.@
+.@.@.@.@@@
+@.@@@.@@@@
+.@@@@@@@@.
+@.@.@@@.@.
+)";
+
+static auto entry([[maybe_unused]]std::span<char const*> const& args) -> void {
+    // std::string str{raw_str};
+    auto str = aoc::read_text("./input.txt").value_or("");
+    str = aoc::trim(str);
+
+    fmt::print("INPUT\n");
+    fmt::print("⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼\n");
+    fmt::print("{}\n", str);
+    fmt::print("{}\n", std::string(80, '-'));
+
+    auto grid = str | std::views::split("\n"sv) | std::views::transform([](auto const& str) {
+        return aoc::trim(std::string{std::begin(str), std::end(str)}) |
+            std::views::transform([](auto const& ch) { return ch; }) |
+            std::ranges::to<std::vector>();
+    }) | std::ranges::to<std::vector>();
+
+    u64 access = 0;
+    for (isize i = 0; i < isize(grid.size()); ++i) {
+        for (isize j = 0; j < isize(grid[i].size()); ++j) {
+            auto const v = grid[i][j];
+            if (v == '.') continue;
+
+            u64 sum = 0;
+            if (i - 1 >= 0 && j - 1 >= 0 && grid[i - 1][j - 1] == '@') ++sum;
+            if (i - 1 >= 0 && grid[i - 1][j] == '@') ++sum;
+            if (i - 1 >= 0 && j + 1 < isize(grid[i].size()) && grid[i - 1][j + 1] == '@') ++sum;
+
+            if (j - 1 >= 0 && grid[i][j - 1] == '@') ++sum;
+            if (j + 1 < isize(grid[i].size()) && grid[i][j + 1] == '@') ++sum;
+
+            if (i + 1 < isize(grid.size()) && j - 1 >= 0 && grid[i + 1][j - 1] == '@') ++sum;
+            if (i + 1 < isize(grid.size()) && grid[i + 1][j] == '@') ++sum;
+            if (i + 1 < isize(grid.size()) && j + 1 < isize(grid[i].size()) && grid[i + 1][j + 1] == '@') ++sum;
+
+            if (sum < 4) {
+                // fmt::print("{},{}: {}\n", i, j, sum);
+                ++access;
+            }
+        }
+    }
+
+    fmt::print("res: {}\n", access);
+}
+
+auto main([[maybe_unused]]int argc, [[maybe_unused]]char const* argv[]) -> int {
+    try {
+        entry({argv, std::next(argv, argc)});
+    } catch (std::exception const& e) {
+        fmt::print(stderr, "{}\n", e.what());
+        return 1;
+    }
+    return 0;
+}

2025/day05.cpp

@@ -0,0 +1,153 @@
+#include <span>
+#include <algorithm>
+#include <ranges>
+#include <string>
+#include <string_view>
+#include <utility>
+#include <vector>
+#include <set>
+
+#include "fmt/std.h"
+
+#include "aoc/types.hpp"
+#include "aoc/utils.hpp"
+
+using namespace std::string_view_literals;
+using namespace aoc::types;
+
+// starts at 50
+[[maybe_unused]]constexpr auto raw_str = R"(
+3-5
+10-14
+16-20
+12-18
+
+1
+5
+8
+11
+17
+32
+)";
+
+static auto entry([[maybe_unused]]std::span<char const*> const& args) -> void {
+    // std::string str{raw_str};
+    auto str = aoc::read_text("./input.txt").value_or("");
+    str = aoc::trim(str);
+
+    auto id_spec = str | std::views::split("\r\n\r\n"sv) | std::views::transform([](auto const& str) {
+        return aoc::trim({std::begin(str), std::end(str)});
+    }) | std::ranges::to<std::vector>();
+
+    if (id_spec.size() < 2) throw std::runtime_error("ID specification is not valid");
+
+    auto id_range = id_spec[0] | std::views::split("\n"sv) | std::views::transform([](auto const& str) {
+        return std::ranges::fold_left(str | std::views::split("-"sv), std::vector<f64>{}, [](auto a, auto const& v) {
+                a.push_back(std::stod(std::string({std::begin(v), std::end(v)})));
+                return a;
+            });
+    }) | std::ranges::to<std::vector>();
+
+    auto ids = id_spec[1] | std::views::split("\n"sv) | std::views::transform([](auto const& str) {
+        return std::stod(std::string{std::begin(str), std::end(str)});
+    }) | std::ranges::to<std::vector>();
+
+    struct range {
+        f64 start;
+        f64 end;
+    };
+
+    // f64 sum = 0;
+
+    // for (usize i = 0; i < ids.size(); ++i) {
+    //     auto const id = ids[i];
+    //     bool is_valid = false;
+    //     for (usize j = 0; j < id_range.size(); ++j) {
+    //         auto const a = id_range[j][0];
+    //         auto const b = id_range[j][1];
+    //
+    //         if (id >= a && id <= b) {
+    //             is_valid = true;
+    //             break;
+    //         }
+    //     }
+    //
+    //     fmt::print("id: {} is {}\n", id, is_valid ? "valid" : "not valid");
+    //
+    //     if (is_valid) ++sum;
+    // }
+
+    std::vector<range> range_vec{};
+    for (usize i = 0; i < id_range.size(); ++i) {
+        auto const a = id_range[i][0];
+        auto const b = id_range[i][1];
+        range_vec.push_back({a, b});
+    }
+
+    std::ranges::sort(range_vec, [](auto a, auto b) {
+        return a.start < b.start;
+    });
+    fmt::print("----------\n");
+
+    // for (auto const& r : range_vec) {
+    //     fmt::print("{}-{}\n", r.start, r.end);
+    // }
+    //
+    // fmt::print("----------\n");
+
+    std::vector<range> ranges{};
+    for (usize i = 0; i < range_vec.size(); i += 1) {
+        auto const& r = range_vec[i];
+        if (ranges.empty()) {
+            ranges.push_back(r);
+            continue;
+        }
+
+        if (ranges.back().start <= r.start && ranges.back().end >= r.end) {
+            continue;
+        }
+
+        if (ranges.back().end >= r.start) {
+            ranges.back().end = r.end;
+            continue;
+        }
+
+        ranges.push_back(r);
+    }
+
+    fmt::print("\n");
+
+    f64 sum = 0.0;
+    for (auto const& r : ranges) {
+        // fmt::print("{}-{}  ", r.start, r.end);
+        auto const d = (r.end - r.start) + 1;
+        fmt::print("{}\n", d);
+        sum += d;
+    }
+
+    fmt::print("res: {}\n", sum);
+
+    //
+    // std::vector<f64> ranges{};
+    // for (auto const& value : set) ranges.push_back(value);
+    // set = {};
+    // std::ranges::sort(ranges);
+    //
+    //
+    // // for (auto const& id : valid_ids) {
+    // //     fmt::print("{} ", id);
+    // // }
+    // fmt::print("\n");
+    //
+    // fmt::print("res: {}\n", sum);
+}
+
+auto main([[maybe_unused]]int argc, [[maybe_unused]]char const* argv[]) -> int {
+    try {
+        entry({argv, std::next(argv, argc)});
+    } catch (std::exception const& e) {
+        fmt::print(stderr, "{}\n", e.what());
+        return 1;
+    }
+    return 0;
+}

2025/day06.cpp

@@ -0,0 +1,130 @@
+#include <span>
+#include <algorithm>
+#include <ranges>
+#include <string>
+#include <string_view>
+#include <utility>
+#include <vector>
+
+#include "fmt/std.h"
+
+#include "aoc/types.hpp"
+#include "aoc/utils.hpp"
+
+using namespace std::string_view_literals;
+using namespace aoc::types;
+
+// starts at 50
+[[maybe_unused]]constexpr auto raw_str = R"(123 328  51 64 
+ 45 64  387 23 
+  6 98  215 314
+*   +   *   +  )";
+
+static auto entry([[maybe_unused]]std::span<char const*> const& args) -> void {
+    // std::string str{raw_str};
+    auto str = aoc::read_text("./input.txt").value_or("");
+    // str = aoc::trim(str);
+
+    // fmt::print("INPUT\n");
+    // fmt::print("⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼⎽⎼⎻⎺⎻⎼\n");
+    // fmt::print("{}\n", str);
+    // fmt::print("{}\n", std::string(80, '-'));
+
+    auto vec = str | std::views::split("\r\n"sv) | std::views::transform([](auto&& line) {
+            return line | std::views::split(" "sv)
+                        | std::views::filter([](auto&& tok) { return !std::ranges::empty(tok); })
+                        | std::views::transform([](auto&& tok) {
+                            return aoc::trim(std::string{std::begin(tok), std::end(tok)});
+                          })
+                        | std::ranges::to<std::vector>();
+      }) | std::ranges::to<std::vector>();
+
+    std::vector<std::vector<std::string>> nums{};
+    std::vector<std::string> ops{};
+
+    for (usize i = 0; i < vec.size(); ++i) {
+        for (usize j = 0; j < vec[i].size(); ++j) {
+            auto const& value = vec[i][j];
+            if (nums.size() <= j) nums.push_back({});
+            if (value == "*" || value == "+") {
+                ops.push_back(value);
+                continue;
+            }
+            nums[j].push_back(vec[i][j]);
+        }
+    }
+
+    // fmt::print("{} {}\n", nums.size(), ops.size());
+
+    f64 sum = 0.0;
+    for (usize i = 0; i < nums.size(); ++i) {
+        auto const& op = ops[i];
+        f64 row_sum = op == "*" ? 1.0 : 0.0;
+        for (usize j = 0; j < nums[i].size(); ++j) {
+            if (op == "*") row_sum *= std::stod(nums[i][j]);
+            else if (op == "+") row_sum += std::stod(nums[i][j]);
+        }
+        // fmt::print("sum: {}\n", row_sum);
+        sum += row_sum;
+    }
+
+    auto lines = str | std::views::split("\r\n"sv) | std::views::transform([](auto&& line) {
+                        return std::string{std::begin(line), std::end(line)};
+                    }) | std::ranges::to<std::vector>();
+
+    // for (usize i = 0; i < lines.size(); ++i) {
+    //     fmt::print("| {} |\n", lines[i]);
+    // }
+
+    for (usize i = 0; i < lines.size(); ++i) {
+        fmt::print("size: {}\n", lines[i].size());
+    }
+
+    std::vector<std::vector<std::string>> mat{};
+    auto const w = lines[0].size();
+    fmt::print("w: {}\n", w);
+
+    for (isize j = w - 1; j >= 0; --j) {
+        std::string tmp{};
+        if (mat.empty()) mat.push_back({});
+        for (usize i = 0; i < lines.size() - 1; ++i) {
+            tmp += lines[i][j];
+        }
+
+        mat.back().push_back(aoc::trim(tmp));
+
+        auto const ch = lines[lines.size() - 2][j];
+        if (ch == '+' || ch == '*') {
+            mat.push_back({});
+            continue;
+        }
+    }
+
+    f64 new_sum = 0.0;
+    for (usize i = 0; i < mat.size() - 1; ++i) {
+        auto const& op = ops[mat.size() - 2 - i];
+        f64 row_sum = op == "*" ? 1.0 : 0.0;
+        for (usize j = 0; j < mat[i].size(); ++j) {
+            if (mat[i][j].empty()) continue;
+
+            fmt::print("{},", aoc::trim(mat[i][j]));
+
+            if (op == "*") row_sum *= std::stod(aoc::trim(mat[i][j]));
+            else if (op == "+") row_sum += std::stod(aoc::trim(mat[i][j]));
+        }
+        new_sum += row_sum;
+        fmt::print("\n");
+    }
+
+    fmt::print("res: {}, {}\n", sum, new_sum);
+}
+
+auto main([[maybe_unused]]int argc, [[maybe_unused]]char const* argv[]) -> int {
+    try {
+        entry({argv, std::next(argv, argc)});
+    } catch (std::exception const& e) {
+        fmt::print(stderr, "{}\n", e.what());
+        return 1;
+    }
+    return 0;
+}

2025/day07.cpp

@@ -0,0 +1,108 @@
+#include <span>
+#include <algorithm>
+#include <ranges>
+#include <string>
+#include <string_view>
+#include <utility>
+#include <vector>
+#include <tuple>
+
+#include "fmt/std.h"
+
+#include "aoc/types.hpp"
+#include "aoc/utils.hpp"
+
+using namespace std::string_view_literals;
+using namespace aoc::types;
+
+// starts at 50
+[[maybe_unused]]constexpr auto raw_str = R"(
+.......S.......
+...............
+.......^.......
+...............
+......^.^......
+...............
+.....^.^.^.....
+...............
+....^.^...^....
+...............
+...^.^...^.^...
+...............
+..^...^.....^..
+...............
+.^.^.^.^.^...^.
+...............
+)";
+
+static auto entry([[maybe_unused]]std::span<char const*> const& args) -> void {
+    // std::string str{raw_str};
+    auto str = aoc::read_text("./input.txt").value_or("");
+    str = aoc::trim(str);
+
+    auto mat = str | std::views::split("\n"sv) | std::views::transform([](auto line) {
+                    return line | std::views::split(""sv)
+                                | std::views::transform([](auto tok) {
+                                        return std::string{std::begin(tok), std::end(tok)};
+                                    })
+                                | std::ranges::to<std::vector>();
+      }) | std::ranges::to<std::vector>();
+
+    struct beam {
+        usize row;
+        usize col;
+    };
+
+    std::vector<beam> beams{};
+    for (usize i = 0; i < mat.size(); ++i) {
+        for (usize j = 0; j < mat[i].size(); ++j) {
+            if (mat[i][j] == "S") {
+                beams.push_back({i, j});
+                break;
+            }
+
+            auto const size = beams.size();
+            for (usize k = 0; k < size; ++k) {
+                if (beams[k].row == i - 1 && beams[k].col == j) {
+                    if (mat[i][j] == ".") {
+                        mat[i][j] = "|";
+                        beams[k] = {i, j};
+                    } else if (mat[i][j] == "^") {
+                        beams[k] = {i, j - 1};
+                        beams.push_back({i, j + 1});
+                        mat[i][j - 1] = "|";
+                        mat[i][j + 1] = "|";
+                    }
+                }
+            }
+        }
+    }
+
+    f64 sum = 0.0;
+    for (usize i = 0; i < mat.size(); ++i) {
+        for (usize j = 0; j < mat[i].size(); ++j) {
+            if (mat[i][j] == "^") {
+                if (mat[i - 1][j] == "|") sum += 1;
+            }
+        }
+    }
+
+    fmt::print("res: {}\n", sum);
+
+    // for (auto const& row : mat) {
+    //     for (auto const& col : row) {
+    //         fmt::print("{}", col);
+    //     }
+    //     fmt::print("\n");
+    // }
+}
+
+auto main([[maybe_unused]]int argc, [[maybe_unused]]char const* argv[]) -> int {
+    try {
+        entry({argv, std::next(argv, argc)});
+    } catch (std::exception const& e) {
+        fmt::print(stderr, "{}\n", e.what());
+        return 1;
+    }
+    return 0;
+}

2025/day08.cpp

@@ -0,0 +1,112 @@
+#include <span>
+#include <algorithm>
+#include <ranges>
+#include <string>
+#include <string_view>
+#include <utility>
+#include <vector>
+#include <tuple>
+
+#include "fmt/std.h"
+
+#include "aoc/types.hpp"
+#include "aoc/utils.hpp"
+
+using namespace std::string_view_literals;
+using namespace aoc::types;
+
+// starts at 50
+[[maybe_unused]]constexpr auto raw_str = R"(
+162,817,812
+57,618,57
+906,360,560
+592,479,940
+352,342,300
+466,668,158
+542,29,236
+431,825,988
+739,650,466
+52,470,668
+216,146,977
+819,987,18
+117,168,530
+805,96,715
+346,949,466
+970,615,88
+941,993,340
+862,61,35
+984,92,344
+425,690,689
+)";
+
+static auto entry([[maybe_unused]]std::span<char const*> const& args) -> void {
+    // std::string str{raw_str};
+    auto str = aoc::read_text("./input.txt").value_or("");
+    str = aoc::trim(str);
+
+    auto mat = str | std::views::split("\n"sv) | std::views::transform([](auto line) {
+                    return line | std::views::split(""sv)
+                                | std::views::transform([](auto tok) {
+                                        return std::string{std::begin(tok), std::end(tok)};
+                                    })
+                                | std::ranges::to<std::vector>();
+      }) | std::ranges::to<std::vector>();
+
+    struct beam {
+        usize row;
+        usize col;
+    };
+
+    std::vector<beam> beams{};
+    for (usize i = 0; i < mat.size(); ++i) {
+        for (usize j = 0; j < mat[i].size(); ++j) {
+            if (mat[i][j] == "S") {
+                beams.push_back({i, j});
+                break;
+            }
+
+            auto const size = beams.size();
+            for (usize k = 0; k < size; ++k) {
+                if (beams[k].row == i - 1 && beams[k].col == j) {
+                    if (mat[i][j] == ".") {
+                        mat[i][j] = "|";
+                        beams[k] = {i, j};
+                    } else if (mat[i][j] == "^") {
+                        beams[k] = {i, j - 1};
+                        beams.push_back({i, j + 1});
+                        mat[i][j - 1] = "|";
+                        mat[i][j + 1] = "|";
+                    }
+                }
+            }
+        }
+    }
+
+    f64 sum = 0.0;
+    for (usize i = 0; i < mat.size(); ++i) {
+        for (usize j = 0; j < mat[i].size(); ++j) {
+            if (mat[i][j] == "^") {
+                if (mat[i - 1][j] == "|") sum += 1;
+            }
+        }
+    }
+
+    fmt::print("res: {}\n", sum);
+
+    // for (auto const& row : mat) {
+    //     for (auto const& col : row) {
+    //         fmt::print("{}", col);
+    //     }
+    //     fmt::print("\n");
+    // }
+}
+
+auto main([[maybe_unused]]int argc, [[maybe_unused]]char const* argv[]) -> int {
+    try {
+        entry({argv, std::next(argv, argc)});
+    } catch (std::exception const& e) {
+        fmt::print(stderr, "{}\n", e.what());
+        return 1;
+    }
+    return 0;
+}

2025/day09.cpp

@@ -0,0 +1,112 @@
+#include <span>
+#include <algorithm>
+#include <ranges>
+#include <string>
+#include <string_view>
+#include <utility>
+#include <vector>
+#include <tuple>
+
+#include "fmt/std.h"
+
+#include "aoc/types.hpp"
+#include "aoc/utils.hpp"
+
+using namespace std::string_view_literals;
+using namespace aoc::types;
+
+// starts at 50
+[[maybe_unused]]constexpr auto raw_str = R"(
+162,817,812
+57,618,57
+906,360,560
+592,479,940
+352,342,300
+466,668,158
+542,29,236
+431,825,988
+739,650,466
+52,470,668
+216,146,977
+819,987,18
+117,168,530
+805,96,715
+346,949,466
+970,615,88
+941,993,340
+862,61,35
+984,92,344
+425,690,689
+)";
+
+static auto entry([[maybe_unused]]std::span<char const*> const& args) -> void {
+    // std::string str{raw_str};
+    auto str = aoc::read_text("./input.txt").value_or("");
+    str = aoc::trim(str);
+
+    auto mat = str | std::views::split("\n"sv) | std::views::transform([](auto line) {
+                    return line | std::views::split(""sv)
+                                | std::views::transform([](auto tok) {
+                                        return std::string{std::begin(tok), std::end(tok)};
+                                    })
+                                | std::ranges::to<std::vector>();
+      }) | std::ranges::to<std::vector>();
+
+    struct beam {
+        usize row;
+        usize col;
+    };
+
+    std::vector<beam> beams{};
+    for (usize i = 0; i < mat.size(); ++i) {
+        for (usize j = 0; j < mat[i].size(); ++j) {
+            if (mat[i][j] == "S") {
+                beams.push_back({i, j});
+                break;
+            }
+
+            auto const size = beams.size();
+            for (usize k = 0; k < size; ++k) {
+                if (beams[k].row == i - 1 && beams[k].col == j) {
+                    if (mat[i][j] == ".") {
+                        mat[i][j] = "|";
+                        beams[k] = {i, j};
+                    } else if (mat[i][j] == "^") {
+                        beams[k] = {i, j - 1};
+                        beams.push_back({i, j + 1});
+                        mat[i][j - 1] = "|";
+                        mat[i][j + 1] = "|";
+                    }
+                }
+            }
+        }
+    }
+
+    f64 sum = 0.0;
+    for (usize i = 0; i < mat.size(); ++i) {
+        for (usize j = 0; j < mat[i].size(); ++j) {
+            if (mat[i][j] == "^") {
+                if (mat[i - 1][j] == "|") sum += 1;
+            }
+        }
+    }
+
+    fmt::print("res: {}\n", sum);
+
+    // for (auto const& row : mat) {
+    //     for (auto const& col : row) {
+    //         fmt::print("{}", col);
+    //     }
+    //     fmt::print("\n");
+    // }
+}
+
+auto main([[maybe_unused]]int argc, [[maybe_unused]]char const* argv[]) -> int {
+    try {
+        entry({argv, std::next(argv, argc)});
+    } catch (std::exception const& e) {
+        fmt::print(stderr, "{}\n", e.what());
+        return 1;
+    }
+    return 0;
+}

CMakeLists.txt

@@ -3,126 +3,17 @@ project(aoc VERSION 0.0.0)
 set_property(GLOBAL PROPERTY USE_FOLDERS ON)  # Group CMake targets inside a folder
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)         # Generate compile_commands.json for language servers
 
-include(FetchContent)
-FetchContent_Declare(
-    fmt
-    GIT_REPOSITORY https://github.com/fmtlib/fmt.git
-    GIT_TAG        10.1.0
-)
-list(APPEND FETCH_CONTENTS fmt)
-FetchContent_Declare(
-    utf8cpp
-    GIT_REPOSITORY https://github.com/nemtrif/utfcpp.git
-    GIT_TAG        v4.0.5
-)
-list(APPEND FETCH_CONTENTS utf8cpp)
-FetchContent_Declare(
-    stb
-    GIT_REPOSITORY https://github.com/mononerv/stb.git
-    GIT_TAG        698c6fb9889c71494b49c9187d249af5fc87b211
-)
-list(APPEND FETCH_CONTENTS stb)
-# Turn off BUILD_TESTING globally to prevent CTest from being included in CTRE
-set(BUILD_TESTING OFF CACHE BOOL "Disable testing globally" FORCE)
-# Set the CTRE_BUILD_TESTS option before including the CTRE library
-set(CTRE_BUILD_TESTS OFF CACHE BOOL "Build ctre Tests" FORCE)
-FetchContent_Declare(
-    ctre
-    GIT_REPOSITORY https://github.com/hanickadot/compile-time-regular-expressions.git
-    GIT_TAG        v3.9.0
-)
-list(APPEND FETCH_CONTENTS ctre)
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
+include("${CMAKE_CURRENT_SOURCE_DIR}/cmake/platform.cmake")
 
-FetchContent_MakeAvailable(${FETCH_CONTENTS})
-find_package(Threads REQUIRED)
-
-# Group dependencies in Visual Studio and Xcode
-if (CMAKE_GENERATOR MATCHES "Visual Studio" OR CMAKE_GENERATOR MATCHES "Xcode")
-    set_target_properties(fmt PROPERTIES FOLDER deps)
-    set_target_properties(stb PROPERTIES FOLDER deps)
-endif()
-
-set(BASE_DEFINITIONS "ASIO_STANDALONE")
-if (APPLE)
-    message("Platform Apple")
-    list(APPEND BASE_DEFINITIONS
-        "AOC_PLATFORM=Apple"
-    )
-    set(IS_UNIX true)
-elseif (UNIX AND NOT APPLE AND NOT EMSCRIPTEN)  # Linux, BSD, Solaris, Minix
-    message("Platform Unix")
-    list(APPEND BASE_DEFINITIONS
-        "AOC_PLATFORM=Linux"
-    )
-    set(IS_UNIX true)
-elseif (WIN32)
-    message("Platform Windows")
-    list(APPEND BASE_DEFINITIONS
-        "AOC_PLATFORM=Windows"
-    )
-else()
-    message(FATAL_ERROR "Unkown platform!")
-endif()
-
-# Compiler specific options
-if (NOT MSVC)
-    set(BASE_OPTIONS
-        "-Wall"
-        "-Wextra"
-        "-Wconversion"
-        "-Wpedantic"
-        "-Wshadow"
-        "-Werror"
-        # fmt warnings
-        "-Wno-unknown-attributes"
-    )
-else()
-    set(BASE_OPTIONS
-        "/W4"
-        "/WX"
-        "/utf-8"
-        "/Zc:__cplusplus"
-        #"/fsanitize=address"  # Doesn't work without Visual Studio
-    )
-endif()
-
-set(HEADERS
-    aoc/aoc.hpp
-)
-set(SOURCES "")
-add_library(aoclib OBJECT ${HEADERS} ${SOURCES})
-target_include_directories(aoclib
-    PUBLIC
-    ${PROJECT_SOURCE_DIR}
-    PRIVATE
-    ${PROJECT_SOURCE_DIR}/aoc
-)
-target_compile_features(aoclib PRIVATE cxx_std_23)
-target_compile_options(aoclib PRIVATE ${BASE_OPTIONS})
-target_compile_definitions(aoclib
-    PRIVATE
-    ${BASE_DEFINITIONS}
-)
-target_link_libraries(aoclib
-    PUBLIC
-    fmt
-    utf8cpp
-    ctre
-    stb::stb
-    Threads::Threads
-)
-source_group(TREE "${CMAKE_CURRENT_LIST_DIR}" FILES ${HEADERS} ${SOURCES})
-
-set(HEADERS "")
-set(SOURCES aoc.cpp)
-add_executable(aoc ${HEADERS} ${SOURCES})
-target_include_directories(aoc PRIVATE ${PROJECT_SOURCE_DIR})
-target_compile_features(aoc PRIVATE cxx_std_23)
-target_compile_options(aoc PRIVATE ${BASE_OPTIONS})
-target_compile_definitions(aoc PRIVATE ${BASE_DEFINITIONS})
-target_link_libraries(aoc
-    PRIVATE
-    aoclib
-)
-source_group(TREE "${CMAKE_CURRENT_LIST_DIR}" FILES ${HEADERS} ${SOURCES})
+add_subdirectory("2025")
 
+# set(HEADERS "")
+# set(SOURCES "aoc.cpp")
+# add_executable(aoc ${HEADERS} ${SOURCES})
+# target_include_directories(aoc PUBLIC ${PROJECT_SOURCE_DIR})
+# target_compile_features(aoc PRIVATE cxx_std_23)
+# target_link_libraries(aoc PRIVATE ${PLATFORM_LINK_LIBRARIES})
+# target_compile_definitions(aoc PRIVATE ${PLATFORM_DEFINITIONS})
+# target_compile_options(aoc PRIVATE ${BASE_OPTIONS})
+# source_group(TREE "${CMAKE_CURRENT_LIST_DIR}" FILES ${HEADERS} ${SOURCES})

README.md

@@ -14,12 +14,6 @@ This project has support for different languages.
 
 There are different ways to setup this project, using `ninja` or Visual Studio.
 
-To use `miniaudio` to play audio on host machine use the flag `-DUSE_MINIAUDIO=ON`.
-
-```sh
-cmake -S . -Bbuild -GNinja -DCMAKE_BUILD_TYPE=Debug
-```
-
 Use `ninja` to build.
 
 

aoc.cpp

@@ -1,72 +0,0 @@
-#include <fstream>
-#include <vector>
-#include <algorithm>
-#include <ranges>
-#include <numeric>
-#include <cmath>
-#include <utility>
-
-#include "fmt/format.h"
-
-#include "aoc/24/01.hpp"
-
-auto main([[maybe_unused]]int argc, [[maybe_unused]]char const* argv[]) -> int {
-    constexpr auto filename = "./dat/24/re/01.txt";
-    std::ifstream strm{filename, std::ios::in};
-    if (!strm.is_open()) {
-        fmt::print("Error opening file: {}\n", filename);
-        return 1;
-    }
-
-    std::vector<std::uint32_t> a{};
-    std::vector<std::uint32_t> b{};
-
-    std::string str{};
-    while (strm) {
-        auto const c = char(strm.peek());
-        if (std::isdigit(c)) {
-            str += char(strm.get());
-            continue;
-        }
-        if (c == ' ') {
-            if (!str.empty()) {
-                a.emplace_back(std::stoi(str));
-                str.clear();
-            }
-        }
-        if (c == '\n') {
-            if (!str.empty()) {
-                b.emplace_back(std::stoi(str));
-                str.clear();
-            }
-        }
-        [[discard]]strm.get();
-    }
-
-    fmt::print("a: {}, b: {}\n", a.size(), b.size());
-
-    std::sort(std::begin(a), std::end(a));
-    std::sort(std::begin(b), std::end(b));
-
-    auto diff_view = std::views::zip(a, b) | std::views::transform([](auto const& p) {
-        auto const [x, y] = p;
-        return x > y ? x - y : y - x;
-    });
-    auto const sum = std::accumulate(std::begin(diff_view), std::end(diff_view), 0);
-
-    fmt::print("Part A: {}\n", std::abs(sum));
-
-    auto values = a | std::views::transform([&b](auto v) {
-        return std::pair{v, b | std::views::filter([v](auto c) {
-            return v == c; // Filter elements in `b` equal to `v`
-        }) | std::ranges::to<std::vector>()};
-    }) | std::ranges::to<std::vector>();
-
-    auto const meow = std::accumulate(std::begin(values), std::end(values), 0, [](auto const acc, auto const& pair) {
-        return acc + std::int32_t(pair.first * pair.second.size());
-    });
-
-    fmt::print("Part B: {}\n", meow);
-
-    return 0;
-}

aoc/aoc.hpp

@@ -1,7 +0,0 @@
-#ifndef AOC_AOC_HPP
-#define AOC_AOC_HPP
-
-namespace aoc {
-}
-
-#endif  // !AOC_AOC_HPP

aoc/types.hpp

@@ -0,0 +1,41 @@
+#ifndef AOC_TYPES_HPP
+#define AOC_TYPES_HPP
+
+#include <type_traits>
+#include <cstddef>
+#include <limits>
+#include <numbers>
+#include <memory>
+#include <system_error>
+#include <expected>
+#include <fstream>
+#include <ranges>
+#include <vector>
+
+namespace aoc {
+namespace types {
+using f32 = float;
+using f64 = double;
+
+using u8  = std::uint8_t;
+using u16 = std::uint16_t;
+using u32 = std::uint32_t;
+using u64 = std::uint64_t;
+
+using usize = std::size_t;
+using isize = std::ptrdiff_t;
+
+using i8  = std::int8_t;
+using i16 = std::int16_t;
+using i32 = std::int32_t;
+using i64 = std::int64_t;
+
+using c8  = char;
+using c16 = char16_t;
+using c32 = char32_t;
+}
+
+using namespace aoc::types;
+}
+
+#endif  // !AOC_TYPES_HPP

aoc/utils.hpp

@@ -0,0 +1,107 @@
+#ifndef AOC_UTILS_HPP
+#define AOC_UTILS_HPP
+
+#include <type_traits>
+#include <cstddef>
+#include <limits>
+#include <numbers>
+#include <memory>
+#include <system_error>
+#include <expected>
+#include <fstream>
+#include <ranges>
+#include <vector>
+#include <string>
+
+#include "aoc/types.hpp"
+
+namespace aoc {
+template <typename T>
+concept Integral = std::is_integral<T>::value;
+
+// Aliases
+namespace nums = std::numbers;
+
+template <typename T>
+using lim = std::numeric_limits<T>;
+
+inline constexpr auto pi = std::numbers::pi;
+
+template <typename T>
+inline constexpr auto pi_v = std::numbers::pi_v<T>;
+
+struct error {
+    std::string msg;
+    std::error_code err;
+};
+
+inline auto make_error(std::string const& str, std::errc ec) -> std::unexpected<error> {
+    return std::unexpected(error{str, std::make_error_code(ec)});
+}
+
+inline auto read_text(std::string const& path) -> std::expected<std::string, aoc::error> {
+    std::fstream strm(path, std::ios::in | std::ios::binary);
+    if (!strm.is_open())
+        return aoc::make_error(path, std::errc::no_such_file_or_directory);
+
+    return std::string{
+        std::istreambuf_iterator<c8>(strm),
+        std::istreambuf_iterator<c8>()
+    };
+}
+
+// ranges and view aliases
+template <typename T>
+using vec = std::vector<T>;
+
+inline constexpr auto split = std::views::split;
+
+[[maybe_unused]]constexpr auto map_to_str = std::views::transform([](auto const& str) {
+    return std::string(std::begin(str), std::end(str));
+});
+
+[[maybe_unused]]constexpr auto map_to_sv = std::views::transform([](auto const& str) {
+    return std::string_view(std::begin(str), std::end(str));
+});
+
+[[maybe_unused]]constexpr auto filter_non_empty = std::views::filter([](auto const& str) {
+    return !str.empty();
+});
+
+template <class F>
+struct pipe {
+    F f;
+};
+
+template <class F>
+pipe(F) -> pipe<F>;
+
+template <class F>
+auto operator|(std::string s, pipe<F> p) -> decltype(auto) {
+    return p.f(std::move(s));
+}
+
+inline auto ltrim(std::string s) -> std::string {
+    s.erase(
+        std::begin(s),
+        std::find_if(s.begin(), s.end(), [](char ch) {
+            return !std::isspace(static_cast<char>(ch));
+        }));
+    return s;
+}
+
+inline auto rtrim(std::string s) -> std::string {
+    s.erase(
+        std::find_if(s.rbegin(), s.rend(), [](char ch) {
+            return !std::isspace(static_cast<char>(ch));
+        }).base(),
+        s.end());
+    return s;
+}
+
+inline auto trim(std::string s) -> std::string {
+    return ltrim(rtrim(std::move(s)));
+}
+}
+
+#endif  // !AOC_UTILS_HPP

cmake/Findctre.cmake

@@ -0,0 +1,74 @@
+if (DEFINED _FINDCTRE_INCLUDED)
+    unset(ctre_FOUND CACHE)
+    unset(ctre_DIR CACHE)
+    unset(ctre_INCLUDE_DIR CACHE)
+    unset(ctre_LIBRARIES CACHE)
+    unset(ctre_VERSION CACHE)
+    return()
+endif()
+set(_FINDCTRE_INCLUDED TRUE)
+
+find_package(ctre QUIET)
+
+if (NOT ctre_FOUND)
+    message(STATUS "ctre not found. Fetching via FetchContent...")
+
+    include(FetchContent)
+
+    find_program(GIT_EXECUTABLE git)
+    if (GIT_EXECUTABLE)
+        set(CTRE_FETCH_METHOD "GIT")
+    else()
+        set(CTRE_FETCH_METHOD "ZIP")
+    endif()
+
+    if (CTRE_FETCH_METHOD STREQUAL "GIT")
+        FetchContent_Declare(
+            ctre
+            GIT_REPOSITORY https://github.com/hanickadot/compile-time-regular-expressions.git
+            GIT_TAG        v3.10.0
+        )
+    else()
+        FetchContent_Declare(
+            ctre
+            URL https://github.com/hanickadot/compile-time-regular-expressions/archive/refs/tags/v3.10.0.zip
+        )
+    endif()
+
+    # Turn off BUILD_TESTING globally to prevent CTest from being included in CTRE
+    set(BUILD_TESTING OFF CACHE BOOL "Disable testing globally" FORCE)
+    # Set the CTRE_BUILD_TESTS option before including the CTRE library
+    set(CTRE_BUILD_TESTS OFF CACHE BOOL "Build ctre Tests" FORCE)
+    FetchContent_MakeAvailable(ctre)
+else()
+    message(STATUS "ctre found.")
+
+    # Ensure we have a usable target
+    if (NOT TARGET ctre::ctre)
+        if (TARGET ctre)
+            add_library(ctre::ctre ALIAS ctre)
+        else()
+            message(FATAL_ERROR "ctre was found, but no CMake target 'ctre' or 'ctre::ctre' exists.")
+        endif()
+    endif()
+
+    # Populate the standard variables
+    set(ctre_FOUND TRUE)
+    set(ctre_LIBRARIES ctre::ctre)
+    get_target_property(_ctre_inc ctre::ctre INTERFACE_INCLUDE_DIRECTORIES)
+    set(ctre_INCLUDE_DIR "${_ctre_inc}")
+endif()
+
+if (NOT TARGET ctre::ctre)
+    if (TARGET ctre)
+        add_library(ctre::ctre ALIAS ctre)
+    else()
+        message(FATAL_ERROR "Could not find or fetch ctre; no target ctre or ctre::ctre available")
+    endif()
+endif()
+
+set(ctre_FOUND        TRUE)
+set(ctre_LIBRARIES    ctre::ctre)
+set(ctre_VERSION      "${ctre_VERSION}")         # this comes from the ctre project
+get_target_property(_ctre_inc ctre::ctre INTERFACE_INCLUDE_DIRECTORIES)
+set(ctre_INCLUDE_DIR  "${_ctre_inc}")

cmake/Findfmt.cmake

@@ -0,0 +1,70 @@
+if (DEFINED _FINDFMT_INCLUDED)
+    unset(fmt_FOUND CACHE)
+    unset(fmt_DIR CACHE)
+    unset(fmt_INCLUDE_DIR CACHE)
+    unset(fmt_LIBRARIES CACHE)
+    unset(fmt_VERSION CACHE)
+    return()
+endif()
+set(_FINDFMT_INCLUDED TRUE)
+
+find_package(fmt QUIET)
+
+if (NOT fmt_FOUND)
+    message(STATUS "fmt not found. Fetching via FetchContent...")
+
+    include(FetchContent)
+
+    find_program(GIT_EXECUTABLE git)
+    if (GIT_EXECUTABLE)
+        set(FMT_FETCH_METHOD "GIT")
+    else()
+        set(FMT_FETCH_METHOD "ZIP")
+    endif()
+
+    if (FMT_FETCH_METHOD STREQUAL "GIT")
+        FetchContent_Declare(
+            fmt
+            GIT_REPOSITORY https://github.com/fmtlib/fmt.git
+            GIT_TAG        12.0.0
+        )
+    else()
+        FetchContent_Declare(
+            fmt
+            URL https://github.com/fmtlib/fmt/releases/download/12.0.0/fmt-12.0.0.zip
+        )
+    endif()
+
+    FetchContent_MakeAvailable(fmt)
+else()
+    message(STATUS "fmt found.")
+
+    # Ensure we have a usable target
+    if (NOT TARGET fmt::fmt)
+        if (TARGET fmt)
+            add_library(fmt::fmt ALIAS fmt)
+        else()
+            message(FATAL_ERROR "fmt was found, but no CMake target 'fmt' or 'fmt::fmt' exists.")
+        endif()
+    endif()
+
+    # Populate the standard variables
+    set(fmt_FOUND TRUE)
+    set(fmt_LIBRARIES fmt::fmt)
+    get_target_property(_fmt_inc fmt::fmt INTERFACE_INCLUDE_DIRECTORIES)
+    set(fmt_INCLUDE_DIR "${_fmt_inc}")
+endif()
+
+if (NOT TARGET fmt::fmt)
+    if (TARGET fmt)
+        add_library(fmt::fmt ALIAS fmt)
+    else()
+        message(FATAL_ERROR "Could not find or fetch fmt; no target fmt or fmt::fmt available")
+    endif()
+endif()
+
+set(fmt_FOUND        TRUE)
+set(fmt_LIBRARIES    fmt::fmt)
+set(fmt_VERSION      "${fmt_VERSION}")         # this comes from the fmt project
+get_target_property(_fmt_inc fmt::fmt INTERFACE_INCLUDE_DIRECTORIES)
+set(fmt_INCLUDE_DIR  "${_fmt_inc}")

cmake/Findutf8cpp.cmake

@@ -0,0 +1,70 @@
+if (DEFINED _FINDUTF8CPP_INCLUDED)
+    unset(utf8cpp_FOUND CACHE)
+    unset(utf8cpp_DIR CACHE)
+    unset(utf8cpp_INCLUDE_DIR CACHE)
+    unset(utf8cpp_LIBRARIES CACHE)
+    unset(utf8cpp_VERSION CACHE)
+    return()
+endif()
+set(_FINDUTF8CPP_INCLUDED TRUE)
+
+find_package(utf8cpp QUIET)
+
+if (NOT utf8cpp_FOUND)
+    message(STATUS "utf8cpp not found. Fetching via FetchContent...")
+
+    include(FetchContent)
+
+    find_program(GIT_EXECUTABLE git)
+    if (GIT_EXECUTABLE)
+        set(UTF8CPP_FETCH_METHOD "GIT")
+    else()
+        set(UTF8CPP_FETCH_METHOD "ZIP")
+    endif()
+
+    if (UTF8CPP_FETCH_METHOD STREQUAL "GIT")
+        FetchContent_Declare(
+            utf8cpp
+            GIT_REPOSITORY https://github.com/nemtrif/utfcpp.git
+            GIT_TAG        v4.0.6
+        )
+    else()
+        FetchContent_Declare(
+            utf8cpp
+            URL https://github.com/nemtrif/utfcpp/archive/refs/tags/v4.0.6.zip
+        )
+    endif()
+
+    FetchContent_MakeAvailable(utf8cpp)
+else()
+    message(STATUS "utf8cpp found.")
+
+    # Ensure we have a usable target
+    if (NOT TARGET utf8cpp::utf8cpp)
+        if (TARGET utf8cpp)
+            add_library(utf8cpp::utf8cpp ALIAS utf8cpp)
+        else()
+            message(FATAL_ERROR "utf8cpp was found, but no CMake target 'utf8cpp' or 'utf8cpp::utf8cpp' exists.")
+        endif()
+    endif()
+
+    # Populate the standard variables
+    set(utf8cpp_FOUND TRUE)
+    set(utf8cpp_LIBRARIES utf8cpp::utf8cpp)
+    get_target_property(_utf8cpp_inc utf8cpp::utf8cpp INTERFACE_INCLUDE_DIRECTORIES)
+    set(utf8cpp_INCLUDE_DIR "${_utf8cpp_inc}")
+endif()
+
+if (NOT TARGET utf8cpp::utf8cpp)
+    if (TARGET utf8cpp)
+        add_library(utf8cpp::utf8cpp ALIAS utf8cpp)
+    else()
+        message(FATAL_ERROR "Could not find or fetch utf8cpp; no target utf8cpp or utf8cpp::utf8cpp available")
+    endif()
+endif()
+
+set(utf8cpp_FOUND        TRUE)
+set(utf8cpp_LIBRARIES    utf8cpp::utf8cpp)
+set(utf8cpp_VERSION      "${utf8cpp_VERSION}")         # this comes from the utf8cpp project
+get_target_property(_utf8cpp_inc utf8cpp::utf8cpp INTERFACE_INCLUDE_DIRECTORIES)
+set(utf8cpp_INCLUDE_DIR  "${_utf8cpp_inc}")

cmake/platform.cmake

@@ -0,0 +1,98 @@
+# cmake/platform.cmake
+# Platform detection + compiler options
+
+if(DEFINED PLATFORM_CONFIG_INCLUDED)
+    return()
+endif()
+set(PLATFORM_CONFIG_INCLUDED TRUE)
+
+# -------------------------------------------------------
+# Platform detection
+# -------------------------------------------------------
+if(APPLE)
+    set(PLATFORM "macOS")
+    message(STATUS "Platform: ${PLATFORM}")
+
+    set(PLATFORM_LINK_LIBRARIES
+        "-framework Cocoa"
+        "-framework IOKit"
+        "-framework CoreVideo"
+        "-framework OpenGL"
+    )
+
+elseif(UNIX AND NOT APPLE AND NOT EMSCRIPTEN) # Linux, BSD, etc.
+    set(PLATFORM "Linux")
+    message(STATUS "Platform: ${PLATFORM}")
+
+    set(PLATFORM_LINK_LIBRARIES
+        dl
+        m
+        GL
+        X11
+    )
+
+elseif(WIN32)
+    set(PLATFORM "Windows")
+    message(STATUS "Platform: ${PLATFORM}")
+
+    set(PLATFORM_LINK_LIBRARIES
+        OpenGL32.lib
+    )
+
+    set(PLATFORM_DEFINITIONS
+        ${PLATFORM_DEFINITIONS}
+        "_WIN32_WINNT=0x0A00"
+    )
+
+elseif(EMSCRIPTEN)
+    set(PLATFORM "Emscripten")
+    message(STATUS "Platform: ${PLATFORM}")
+
+    # Emscripten specific flags (not the warnings; those are below)
+    add_compile_options(
+        -pthread
+        -fexceptions
+        -sUSE_PTHREADS=1
+    )
+    add_link_options(
+        -pthread
+        -fexceptions
+        -sUSE_PTHREADS=1
+    )
+
+else()
+    message(FATAL_ERROR "Platform: Unknown!")
+endif()
+
+# -------------------------------------------------------
+# Compiler specific options (BASE_OPTIONS)
+# -------------------------------------------------------
+if(NOT MSVC)
+    set(BASE_OPTIONS
+        -Wall
+        -Wextra
+        # -Werror
+        # fmt warnings
+        -Wno-deprecated-literal-operator
+    )
+
+    if(EMSCRIPTEN)
+        list(APPEND BASE_OPTIONS
+            # asio
+            -Wno-sign-conversion
+            -Wno-shadow
+            -Wno-shorten-64-to-32
+            -Wno-implicit-int-conversion
+            -Wno-unused-private-field
+            -Wno-deprecated-declarations
+        )
+    endif()
+else()
+    set(BASE_OPTIONS
+        /W4
+        # /WX          # warnings as errors (MSVC equivalent of -Werror)
+        /utf-8
+        /Zc:__cplusplus
+        #/fsanitize=address  # Doesn't work without Visual Studio
+    )
+endif()

dat/24/ex/01.txt

@@ -1,6 +0,0 @@
-3   4
-4   3
-2   5
-1   3
-3   9
-3   3

meson.build

@@ -1,19 +0,0 @@
-project(
-  'aoc',
-  ['cpp', 'c++']
-  version: '0.0.0',
-  default_options: [
-    'c_std=c2x',
-    'cpp_std=c++23'
-  ]
-)
-
-executable(
-  'aoc',
-  [
-    'aoc.cpp'
-  ],
-  include_directories: [
-    include_directories('.')
-  ]
-)