Add solution for 2016 Day 8

res/2016/day08/test_input.txt

@@ -0,0 +1,4 @@
+rect 3x2
+rotate column x=1 by 1
+rotate row y=0 by 4
+rotate column x=1 by 1

src/2016/Day08.cpp

@@ -2,30 +2,100 @@
 
 namespace y2016::day08
 {
-  REGISTER_DAY(2016, Day08, std::vector<int>, int);
+  enum class Operation
+  {
+    Rect,
+    Col,
+    Row
+  };
 
-  REGISTER_TEST_EXAMPLE(2016, Day08, ExampleInput, 1, 0);
-  REGISTER_TEST(2016, Day08, Input, 1, 0);
-  REGISTER_TEST_EXAMPLE(2016, Day08, ExampleInput, 2, 0);
-  REGISTER_TEST(2016, Day08, Input, 2, 0);
+  struct Instruction
+  {
+    Operation operation;
+    int i1;
+    int i2;
+  };
+
+  REGISTER_DAY(2016, Day08, std::vector<Instruction>, int);
+
+  REGISTER_TEST_EXAMPLE(2016, Day08, ExampleInput, 1, 6);
+  REGISTER_TEST(2016, Day08, Input, 1, 115);
 
   READ_INPUT(input)
   {
-    std::vector<int> vec;
+    std::vector<Instruction> vec;
     std::string str;
     while (getline(input, str))
     {
+      Instruction instruction;
+      std::stringstream ss{str};
+      if (str[1] == 'e')  // rect
+      {
+        instruction.operation = Operation::Rect;
+        ss >> "rect " >> instruction.i1 >> "x" >> instruction.i2;
+      }
+      else if (str[7] == 'r')  // rotate row
+      {
+        instruction.operation = Operation::Row;
+        ss >> "rotate row y=" >> instruction.i1 >> "by " >> instruction.i2;
+      }
+      else  // rotate column
+      {
+        instruction.operation = Operation::Col;
+        ss >> "rotate column x=" >> instruction.i1 >> "by " >> instruction.i2;
+      }
+      vec.emplace_back(instruction);
     }
     return vec;
   }
 
   OUTPUT1(input)
   {
-    return 0;
+    Array2D<char> data{isExample ? 7 : 50, isExample ? 3 : 6, ' '};
+    for (const auto& instruction : input)
+    {
+      switch (instruction.operation)
+      {
+        case Operation::Rect:
+          for (int y = 0; y < instruction.i2; y++)
+          {
+            for (int x = 0; x < instruction.i1; x++)
+            {
+              data.Set(x, y, '#');
+            }
+          }
+          break;
+        case Operation::Row:
+          for (int i = 0; i < instruction.i2; i++)
+          {
+            char tmp = data.Get(data.width - 1, instruction.i1);
+            for (int x = data.width - 1; x > 0; x--)
+            {
+              data.Set(x, instruction.i1, data.Get(x - 1, instruction.i1));
+            }
+            data.Set(0, instruction.i1, tmp);
+          }
+          break;
+        case Operation::Col:
+          for (int i = 0; i < instruction.i2; i++)
+          {
+            char tmp = data.Get(instruction.i1, data.height - 1);
+            for (int y = data.height - 1; y > 0; y--)
+            {
+              data.Set(instruction.i1, y, data.Get(instruction.i1, y - 1));
+            }
+            data.Set(instruction.i1, 0, tmp);
+          }
+          break;
+      }
+    }
+    std::cout << data << std::endl;
+    return data.Count('#');
   }
 
   OUTPUT2(input)
   {
+    // Solution is printed in Part 1
     return 0;
   }
 }

src/2021/Day13.cpp

@@ -93,7 +93,7 @@ namespace y2021::day13
     {
       board[index] = '#';
     }
-    std::cout << board;
+    std::cout << board << std::endl;
     // Not the "correct" output to part 2, but it verifies something at least
     return indices.size();
   }

src/common/lib/Array2D.h

@@ -508,7 +508,8 @@ struct Array2D
       {
         os << array2D.Get(x, y);
       }
-      os << std::endl;
+      if (y != array2D.height - 1)
+        os << std::endl;
     }
     return std::cout;
   }