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 +1,84 @@
+#include "common/aoc.h"
+
+namespace day10
+{
+  REGISTER_DAY(2024, Day10, Array2D<int>, int32_t);
+
+  REGISTER_TEST_EXAMPLE(2024, Day10, ExampleInput, 1, 36);
+  REGISTER_TEST(2024, Day10, Input, 1, 786);
+  REGISTER_TEST_EXAMPLE(2024, Day10, ExampleInput, 2, 81);
+  REGISTER_TEST(2024, Day10, Input, 2, 1722);
+
+  READ_INPUT(input)
+  {
+    return Input::ReadDigitsAsArray2D(input);
+  }
+
+  void GetTops(const Array2D<int>& map, Index2D pos, std::set<Index2D>& visited)
+  {
+    int val = map.Get(pos);
+    if (val == 9)
+    {
+      visited.emplace(pos);
+      return;
+    }
+
+    std::vector<Index2D> indices{Index2D{-1, 0}, Index2D{1, 0}, Index2D{0, -1}, Index2D{0, 1}};
+    for (auto index : indices)
+    {
+      if (map.IsInside(pos + index) && map.Get(pos + index) == val + 1)
+        GetTops(map, pos + index, visited);
+    }
+  }
+
+  int CountPaths(const Array2D<int>& map, Index2D pos)
+  {
+    int val = map.Get(pos);
+    if (val == 9)
+      return 1;
+
+    int paths = 0;
+    std::vector<Index2D> indices{Index2D{-1, 0}, Index2D{1, 0}, Index2D{0, -1}, Index2D{0, 1}};
+    for (auto index : indices)
+    {
+      if (map.IsInside(pos + index) && map.Get(pos + index) == val + 1)
+        paths += CountPaths(map, pos + index);
+    }
+
+    return paths;
+  }
+
+  OUTPUT1(input)
+  {
+    int32_t sum = 0;
+    for (int y = 0; y < input.height; y++)
+    {
+      for (int x = 0; x < input.width; x++)
+      {
+        if (input.Get(x, y) == 0)
+        {
+          std::set<Index2D> visited;
+          GetTops(input, Index2D{x, y}, visited);
+          sum += visited.size();
+        }
+      }
+    }
+    return sum;
+  }
+
+  OUTPUT2(input)
+  {
+    int32_t sum = 0;
+    for (int y = 0; y < input.height; y++)
+    {
+      for (int x = 0; x < input.width; x++)
+      {
+        if (input.Get(x, y) == 0)
+        {
+          sum += CountPaths(input, Index2D{x, y});
+        }
+      }
+    }
+    return sum;
+  }
+}