day12: solve part 1 & 2

2020-12-19 13:48:12 +01:00 · 2020-12-19 13:48:12 +01:00 · a2fcbe9849
commit a2fcbe9849
parent ac9c3551f9
4 changed files with 1708 additions and 0 deletions
--- a/day12/part1/input
+++ b/day12/part1/input
@ -0,0 +1,774 @@
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--- a/day12/part1/main.d
+++ b/day12/part1/main.d
@ -0,0 +1,89 @@
+import std;
+
+void main()
+{
+    slurp!(char, ulong)("input", "%c%d").getManhattanDistanceForInstructions.writeln;
+}
+
+enum Direction
+{
+    east = 0,
+    north = 1,
+    west = 2,
+    south = 3
+}
+
+alias Instruction = Tuple!(char, ulong);
+
+struct ShipState
+{
+    immutable long posX = 0;
+    immutable long posY = 0;
+    immutable Direction direction = Direction.east;
+
+    private auto calculateXMovement(Direction direction, ulong value)
+    {
+        switch (direction) with (Direction)
+        {
+        case east:
+            return value;
+        case west:
+            return -value;
+        default:
+            return 0;
+        }
+    }
+
+    private auto calculateYMovement(Direction direction, ulong value)
+    {
+        switch (direction) with (Direction)
+        {
+        case north:
+            return value;
+        case south:
+            return -value;
+        default:
+            return 0;
+        }
+    }
+
+    ShipState withInstructionApplied(Instruction instruction)
+    {
+        return [
+            'E': (ulong value) => ShipState(posX + value, posY, direction),
+            'N': (ulong value) => ShipState(posX, posY + value, direction),
+            'W': (ulong value) => ShipState(posX - value, posY, direction),
+            'S': (ulong value) => ShipState(posX, posY - value, direction),
+            'L': (ulong value) => ShipState(posX, posY,
+                    ((direction + value / 90) % 4).to!Direction),
+            'R': (ulong value) => ShipState(posX, posY,
+                    ((direction - value / 90 + 4) % 4).to!Direction),
+            'F': (ulong value) => ShipState(posX + calculateXMovement(direction,
+                    value), posY + calculateYMovement(direction, value), direction)
+        ][instruction[0]](instruction[1]);
+    }
+
+    ShipState withInstructionsApplied(Instruction[] instructions)
+    {
+        if (instructions.empty)
+        {
+            return this;
+        }
+        return withInstructionApplied(instructions[0]).withInstructionsApplied(instructions[1 .. $]);
+    }
+}
+
+auto getManhattanDistanceForInstructions(Instruction[] instructions)
+{
+    auto finalState = ShipState().withInstructionsApplied(instructions);
+    return abs(finalState.posX) + abs(finalState.posY);
+}
+
+unittest
+{
+    auto input = [
+        tuple('F', 10UL), tuple('N', 3UL), tuple('F', 7UL), tuple('R', 90UL),
+        tuple('F', 11UL)
+    ];
+    assert(input.getManhattanDistanceForInstructions == 25);
+}
--- a/day12/part2/input
+++ b/day12/part2/input
@ -0,0 +1,774 @@
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+E5
+F32
+S2
+N5
+W3
+R90
+W5
+S2
+L90
+F4
+R270
+N5
+E3
+L90
+S5
+F24
+N4
+R90
+F27
+L90
+F16
+R90
+N2
+R90
+N3
+L90
+S3
+L90
+F85
+S3
+F47
+N1
+E1
+N3
+R270
+S2
+L90
+F50
+L90
+S2
+F23
+N4
+L180
+E3
+F91
+R90
+E1
+W4
+F81
+W5
+R90
+F46
+E1
+W1
+F91
+N5
+W5
+N3
+W1
+L90
+F60
+S2
+L90
+E1
+F82
+S3
+W5
+N5
+F90
+E3
+S1
+F61
+E4
+F98
+R180
+F8
+R270
+F73
+W4
+L90
+W5
+L90
+F86
+W5
+L180
+F61
+N5
+F88
+E2
+L270
+F90
+N5
+F21
+R270
+F40
+L90
+W1
+N2
+L90
+E2
+S5
+E2
+S1
+E5
+N3
+F51
+S1
+F58
+W3
+L180
+F13
+R90
+N1
+F79
+W2
+F61
+R90
+F22
+E2
+N5
+F1
+S4
+F99
+S1
+S3
+E2
+F97
--- a/day12/part2/main.d
+++ b/day12/part2/main.d
@ -0,0 +1,71 @@
+import std;
+
+void main()
+{
+    slurp!(char, long)("input", "%c%d").getManhattanDistanceForInstructions.writeln;
+}
+
+alias Instruction = Tuple!(char, long);
+
+alias RelativeWaypoint = Tuple!(long, long);
+
+auto rotateLeft(RelativeWaypoint relativeWaypoint, long n)
+{
+    n = (n + 4) % 4;
+    if (n == 0)
+        return relativeWaypoint;
+
+    return tuple(-relativeWaypoint[1], relativeWaypoint[0]).rotateLeft(n - 1);
+}
+
+struct ShipState
+{
+    immutable long posX = 0;
+    immutable long posY = 0;
+
+    RelativeWaypoint relativeWaypoint = tuple(10, 1);
+
+    ShipState withInstructionApplied(Instruction instruction)
+    {
+        return [
+            'E': (long value) => ShipState(posX, posY,
+                    tuple(relativeWaypoint[0] + value, relativeWaypoint[1])),
+            'N': (long value) => ShipState(posX, posY,
+                    tuple(relativeWaypoint[0], relativeWaypoint[1] + value)),
+            'W': (long value) => ShipState(posX, posY,
+                    tuple(relativeWaypoint[0] - value, relativeWaypoint[1])),
+            'S': (long value) => ShipState(posX, posY,
+                    tuple(relativeWaypoint[0], relativeWaypoint[1] - value)),
+            'L': (long value) => ShipState(posX, posY,
+                    relativeWaypoint.rotateLeft(value / 90)),
+            'R': (long value) => ShipState(posX, posY,
+                    relativeWaypoint.rotateLeft((360 - value) / 90)),
+            'F': (long value) => ShipState(posX + relativeWaypoint[0] * value,
+                    posY + relativeWaypoint[1] * value, relativeWaypoint)
+        ][instruction[0]](instruction[1]);
+    }
+
+    ShipState withInstructionsApplied(Instruction[] instructions)
+    {
+        if (instructions.empty)
+        {
+            return this;
+        }
+        return withInstructionApplied(instructions[0]).withInstructionsApplied(instructions[1 .. $]);
+    }
+}
+
+auto getManhattanDistanceForInstructions(Instruction[] instructions)
+{
+    auto finalState = ShipState().withInstructionsApplied(instructions);
+    return abs(finalState.posX) + abs(finalState.posY);
+}
+
+unittest
+{
+    auto input = [
+        tuple('F', 10L), tuple('N', 3L), tuple('F', 7L), tuple('R', 90L),
+        tuple('F', 11L)
+    ];
+    assert(input.getManhattanDistanceForInstructions == 286);
+}