2025 day06 p2

2025/day06.cpp

@@ -15,33 +15,31 @@ using namespace std::string_view_literals;
 using namespace aoc::types;
 
 // starts at 50
-[[maybe_unused]]constexpr auto raw_str = R"(
+[[maybe_unused]]constexpr auto raw_str = R"(123 328  51 64 
-123 328  51 64
+ 45 64  387 23 
- 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);
+    // 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) {
+    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 std::string{std::begin(tok), std::end(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<f64>> nums{};
+    std::vector<std::vector<std::string>> nums{};
     std::vector<std::string> ops{};
 
     for (usize i = 0; i < vec.size(); ++i) {
@@ -52,7 +50,7 @@ static auto entry([[maybe_unused]]std::span<char const*> const& args) -> void {
                 ops.push_back(value);
                 continue;
             }
-            nums[j].push_back(std::stod(vec[i][j]));
+            nums[j].push_back(vec[i][j]);
         }
     }
 
@@ -63,14 +61,62 @@ static auto entry([[maybe_unused]]std::span<char const*> const& args) -> void {
         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];
+            if (op == "*") row_sum *= std::stod(nums[i][j]);
-            else if (op == "+") row_sum += nums[i][j];
+            else if (op == "+") row_sum += std::stod(nums[i][j]);
         }
         // fmt::print("sum: {}\n", row_sum);
         sum += row_sum;
     }
 
-    fmt::print("res: {}\n", 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 {

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;
+}