2025 day 06 p1

2025/CMakeLists.txt

@@ -33,4 +33,5 @@ add_day_executables(
     "day03.cpp"
     "day04.cpp"
     "day05.cpp"
+    "day06.cpp"
 )

2025/day06.cpp

@@ -0,0 +1,84 @@
+#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("\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 std::string{std::begin(tok), std::end(tok)};
+                          })
+                        | std::ranges::to<std::vector>();
+      }) | std::ranges::to<std::vector>();
+
+    std::vector<std::vector<f64>> 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(std::stod(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 *= nums[i][j];
+            else if (op == "+") row_sum += nums[i][j];
+        }
+        // fmt::print("sum: {}\n", row_sum);
+        sum += row_sum;
+    }
+
+    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;
+}