aoc24: day03 tokenizer

sol/24/01/entry.cpp

@@ -0,0 +1,61 @@
+#include "aoc/aoc.hpp"
+#include "fmt/format.h"
+
+// auto aoc::entry([[maybe_unused]]std::vector<std::string_view> const& args) -> void {
+//     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);
+// }