Add solution for 2016 Day 2

res/2016/day02/test_input.txt

@@ -0,0 +1,4 @@
+ULL
+RRDDD
+LURDL
+UUUUD

src/2016/Day02.cpp

@@ -2,30 +2,125 @@
 
 namespace y2016::day02
 {
-  REGISTER_DAY(2016, Day02, std::vector<int>, int);
+  REGISTER_DAY(2016, Day02, std::vector<std::string>, std::string);
 
-  REGISTER_TEST_EXAMPLE(2016, Day02, ExampleInput, 1, 0);
-  REGISTER_TEST(2016, Day02, Input, 1, 0);
-  REGISTER_TEST_EXAMPLE(2016, Day02, ExampleInput, 2, 0);
-  REGISTER_TEST(2016, Day02, Input, 2, 0);
+  REGISTER_TEST_EXAMPLE(2016, Day02, ExampleInput, 1, "1985");
+  REGISTER_TEST(2016, Day02, Input, 1, "14894");
+  REGISTER_TEST_EXAMPLE(2016, Day02, ExampleInput, 2, "5DB3");
+  REGISTER_TEST(2016, Day02, Input, 2, "26B96");
 
   READ_INPUT(input)
   {
-    std::vector<int> vec;
+    std::vector<std::string> vec;
     std::string str;
     while (getline(input, str))
     {
+      vec.emplace_back(str);
     }
     return vec;
   }
 
+  char IndexToChar1(Index2D index)
+  {
+    return (index.x + index.y * 3) + '1';
+  }
+
+  char IndexToChar2(Index2D index)
+  {
+    if (index.y == 0)
+      return '1';
+    if (index.y == 1)
+      return '2' + index.x - 1;
+    if (index.y == 2)
+      return '5' + index.x;
+    if (index.y == 3)
+      return 'A' + index.x - 1;
+    if (index.y == 4)
+      return 'D';
+    return 'X';
+  }
+
+  void ClampX(Index2D& pos)
+  {
+    if (pos.y == 0 || pos.y == 4)
+      pos.x = std::clamp(pos.x, 2, 2);
+    if (pos.y == 1 || pos.y == 3)
+      pos.x = std::clamp(pos.x, 1, 3);
+    if (pos.y == 2)
+      pos.x = std::clamp(pos.x, 0, 4);
+  }
+
+  void ClampY(Index2D& pos)
+  {
+    if (pos.x == 0 || pos.x == 4)
+      pos.y = std::clamp(pos.y, 2, 2);
+    if (pos.x == 1 || pos.x == 3)
+      pos.y = std::clamp(pos.y, 1, 3);
+    if (pos.x == 2)
+      pos.y = std::clamp(pos.y, 0, 4);
+  }
+
   OUTPUT1(input)
   {
-    return 0;
+    Index2D pos{1, 1};
+    std::string code = "";
+    for (const auto& instructions : input)
+    {
+      for (const auto& instruction : instructions)
+      {
+        switch (instruction)
+        {
+          case 'R':
+            pos.x++;
+            break;
+          case 'L':
+            pos.x--;
+            break;
+          case 'U':
+            pos.y--;
+            break;
+          case 'D':
+            pos.y++;
+            break;
+        }
+        pos.x = std::clamp(pos.x, 0, 2);
+        pos.y = std::clamp(pos.y, 0, 2);
+      }
+      code += IndexToChar1(pos);
+    }
+    return code;
   }
 
   OUTPUT2(input)
   {
-    return 0;
+    Index2D pos{0, 2};
+    std::string code = "";
+    for (const auto& instructions : input)
+    {
+      for (const auto& instruction : instructions)
+      {
+        switch (instruction)
+        {
+          case 'R':
+            pos.x++;
+            ClampX(pos);
+            break;
+          case 'L':
+            pos.x--;
+            ClampX(pos);
+            break;
+          case 'U':
+            pos.y--;
+            ClampY(pos);
+            break;
+          case 'D':
+            pos.y++;
+            ClampY(pos);
+            break;
+        }
+      }
+      code += IndexToChar2(pos);
+    }
+    return code;
   }
 }