not complete

aoc.cpp

@@ -8,19 +8,20 @@
 
 #include "fmt/format.h"
 
-#include "aoc/24/01.hpp"
+using levels_t  = std::vector<std::uint32_t>;
+using reports_t = std::vector<levels_t>;
 
 auto main([[maybe_unused]]int argc, [[maybe_unused]]char const* argv[]) -> int {
-    constexpr auto filename = "./dat/24/re/01.txt";
+    constexpr auto filename = "./dat/24/ex/02.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{};
+    reports_t reports{};
-    std::vector<std::uint32_t> b{};
 
+    levels_t levels{};
     std::string str{};
     while (strm) {
         auto const c = char(strm.peek());
@@ -30,43 +31,18 @@ auto main([[maybe_unused]]int argc, [[maybe_unused]]char const* argv[]) -> int {
         }
         if (c == ' ') {
             if (!str.empty()) {
-                a.emplace_back(std::stoi(str));
+                levels.emplace_back(std::stoi(str));
                 str.clear();
             }
         }
         if (c == '\n') {
             if (!str.empty()) {
-                b.emplace_back(std::stoi(str));
+                reports.emplace_back(std::move(levels));
                 str.clear();
             }
         }
-        [[discard]]strm.get();
+        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;
 }

dat/24/ex/02.txt

@@ -0,0 +1,6 @@
+7 6 4 2 1
+1 2 7 8 9
+9 7 6 2 1
+1 3 2 4 5
+8 6 4 4 1
+1 3 6 7 9