Initial commit with solutions from 2024

2025-11-26 21:59:50 +01:00
commit be113565fb
72 changed files with 7030 additions and 0 deletions
@@ -0,0 +1,55 @@
+#include "common/aoc.h"
+
+namespace day16
+{
+  REGISTER_DAY(2024, Day16, Array2D<char>, int32_t);
+
+  REGISTER_TEST_EXAMPLE(2024, Day16, ExampleInput, 1, 7036);
+  REGISTER_TEST(2024, Day16, Input, 1, 72428);
+  REGISTER_TEST_EXAMPLE(2024, Day16, ExampleInput, 2, 45);
+  REGISTER_TEST(2024, Day16, Input, 2, 456);
+
+  READ_INPUT(input)
+  {
+    return Input::ReadArray2D(input);
+  }
+
+  std::vector<std::pair<int, std::pair<Index2D, Index2D>>> Branch(const Array2D<char>& map,
+                                                                  const std::pair<Index2D, Index2D>& state)
+  {
+    std::vector<std::pair<int, std::pair<Index2D, Index2D>>> paths;
+    if (map.Get(state.first + state.second) != '#')
+      paths.emplace_back(1, std::pair{state.first + state.second, state.second});
+
+    Index2D dir2 = Index2D{state.second.y, -state.second.x};
+    if (map.Get(state.first + dir2) != '#')
+      paths.emplace_back(1001, std::pair{state.first + dir2, dir2});
+
+    Index2D dir3 = Index2D{-state.second.y, state.second.x};
+    if (map.Get(state.first + dir3) != '#')
+      paths.emplace_back(1001, std::pair{state.first + dir3, dir3});
+
+    return paths;
+  }
+
+  bool Goal(const Array2D<char>& map, const std::pair<Index2D, Index2D>& state)
+  {
+    return map.Get(state.first) == 'E';
+  }
+
+  OUTPUT1(input)
+  {
+    return Helper::Dijkstras(input, std::pair{input.Find('S'), Index2D{1, 0}}, Branch, Goal);
+  }
+
+  OUTPUT2(input)
+  {
+    std::set<std::pair<Index2D, Index2D>> allVisited =
+      Helper::DijkstrasAllVisited(input, std::pair{input.Find('S'), Index2D{1, 0}}, Branch, Goal);
+
+    std::set<Index2D> solutions;
+    for (const auto& [pos, dir] : allVisited) solutions.emplace(pos);
+
+    return solutions.size();
+  }
+}