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Day 12

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This commit is contained in:
Chris Pickett
2020-12-12 22:23:01 -06:00
parent 97d7d0141d
commit 5defd6ff60
4 changed files with 1014 additions and 0 deletions
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N4
F85
L90
N4
E3
L90
E1
L90
W4
R270
S5
F54
N5
W4
L90
N1
F55
L90
S2
N2
L180
F97
W1
F55
N1
L180
F45
F49
L90
F76
R90
S3
F35
N3
W1
S4
R90
S4
F83
L90
S1
F41
S2
R90
F98
N5
F51
L90
N4
W1
F73
W5
F34
S3
R180
F85
N1
F74
W4
F97
L270
F65
W5
R90
S1
W5
L90
W2
N4
N1
F81
S3
L270
F96
W2
F39
F27
W4
L180
F75
N4
W2
F38
R90
W4
F100
R180
E5
R180
E5
R90
S5
L90
F17
W3
N5
F9
N1
W4
F80
S1
W4
F50
R180
W4
L90
E4
F78
N3
F86
W2
R90
F46
S3
W5
L180
S1
L90
L90
F54
R90
N5
E5
F83
S4
W3
R180
E4
N5
E5
F90
W1
S3
W5
F91
L90
N1
F22
E4
S2
F65
R90
F16
R90
E4
R180
W3
R90
F94
L180
F2
W1
R180
N1
F59
R270
E2
R90
S3
S3
R90
F52
N2
L90
R90
E5
L90
R180
S3
F26
E4
S1
W5
R90
E5
F69
E2
L90
S2
E3
S5
W2
S3
W3
F78
N5
E5
F87
L90
W5
S1
L90
F21
L90
F80
W2
N4
W2
L270
F52
L90
R90
N3
F29
L90
F20
R90
W1
R90
E1
F100
W1
S4
E3
S3
F73
S4
L90
S5
W4
R180
E4
F32
S1
R270
E4
S5
L90
F64
F12
E5
F59
E4
F85
N2
F27
R90
W4
N2
F7
N2
E3
F70
W1
R180
F50
R270
F43
L90
E3
F23
W4
N2
F15
L180
N4
F31
R90
F35
N1
E2
S4
E4
N1
F98
S2
W5
N5
R90
F59
W2
F22
S1
S4
W5
F10
L90
E3
R90
W4
F11
N3
L90
F12
S1
R90
F25
E3
E1
R90
F66
S5
E1
F33
W1
F57
L90
N4
F44
W4
L90
N5
L270
F25
S3
F20
L180
E4
R90
F49
E4
S1
F96
W2
R90
F26
L180
F78
L180
F88
W2
N4
E1
F12
E4
F81
E1
F97
S3
E2
F21
R180
S4
E1
S4
E5
R90
E4
S2
S1
L90
L90
W1
S5
L180
S2
W2
S2
E5
N5
W5
F57
R270
N1
W3
N5
F47
R180
F28
S1
E1
L180
F34
N1
F96
S5
W2
L90
S5
F48
L90
E4
S5
F24
L90
F95
W1
R180
E2
F76
R90
N1
F51
S3
E4
F24
S2
E5
R90
E1
R90
S4
E3
F70
S1
E4
F43
R180
F84
E2
R90
F70
E1
R90
F85
E2
L90
F29
S4
F73
F25
S5
R180
S2
F66
S3
F5
F52
N3
L180
E5
F14
W5
S5
F81
N4
F67
E3
R180
S1
W4
F96
F100
L270
F65
R90
W2
S5
E3
F32
F61
L180
F57
N2
L90
F10
F57
N2
R90
F34
E5
F13
E3
N2
L90
N2
F68
N3
W1
F49
L90
F91
E3
F84
F73
L90
S1
E3
S4
F66
L90
N3
E2
S1
L180
S5
L90
S4
E4
S1
L180
R90
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W4
F59
L90
F6
R90
W2
S5
R180
S1
S2
F96
W1
R180
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R90
F67
W5
L270
E4
F51
R180
S4
L90
F59
E5
F66
E2
S1
E4
F79
S1
L180
F41
R270
F66
L90
F90
E4
S2
R180
W2
F4
L90
S5
L90
F18
L90
F90
R90
N4
E5
R90
E4
S2
W3
F97
W4
F53
L90
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F61
S2
F72
E4
R90
S2
R90
S2
F56
W2
R180
W3
L90
F31
F65
S2
F11
N5
W4
L270
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N4
L90
F90
L90
N3
L90
E3
L90
F8
S2
F63
L270
E4
F51
F40
L90
F34
W1
L180
F79
N5
R90
L90
W3
L180
W1
L180
E1
R90
N2
E5
S1
R90
E3
S2
E2
F56
S2
W3
F95
R90
N4
R270
W4
S5
F33
L180
N3
F95
N1
E2
S3
F4
L90
F66
S1
R90
E2
S3
F11
R90
S5
N1
E2
F64
N2
W5
S2
F2
N1
R90
N4
L180
N1
F95
W5
F99
F6
N4
F69
S2
E4
F49
R90
F91
F76
R90
S1
E2
S3
F79
W4
L90
F18
S5
R90
E4
S1
F91
N3
F40
E2
L90
W2
S4
R90
S1
R90
F59
W3
N2
W1
F86
R90
F32
S1
F22
S2
F4
S3
E5
S4
S4
E5
S4
F36
E4
L90
F35
L180
N1
W1
L90
N4
R180
R90
F22
R180
E2
S2
W5
F99
E2
S3
F22
E1
L180
S2
L180
W4
R270
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E2
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E5
L90
N4
R90
W4
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W5
N5
W4
S2
E3
N4
W1
F95
W1
F10
N3
R90
W1
F73
W1
N3
F33
L180
E3
R90
R90
N2
E4
E5
W4
N1
F91
N1
W1
F49
S2
E5
S3
F43
W5
F34
E3
E1
N1
E3
L180
W2
F27
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E5
F28
R90
W1
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F99
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W1
W1
R180
W1
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F35

3
2020.csproj
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@ -44,6 +44,9 @@
<None Update="11input.txt">
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</None>
<None Update="12input.txt">
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</None>
</ItemGroup>
</Project>

1
Program.cs
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@ -16,6 +16,7 @@
Q09.Go();
Q10.Go();
Q11.Go();
Q12.Go();
Util.Log($"Total time={(System.DateTime.Now - start).TotalMilliseconds}ms");
}
}

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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
namespace _2020
{
class Q12
{
[DebuggerDisplay("({x}, {y})")]
struct Vec2
{
public int x;
public int y;
}
static Vec2 shipPosition;
static Vec2 waypointPosition = new Vec2() { x = 10, y = 1 };
static int facingDir = 90;
static List<Tuple<char, int>> instructions = new List<Tuple<char, int>>();
public static void Go()
{
var start = DateTime.Now;
MakeList();
Util.Log($"Q12 MakeList took {(DateTime.Now - start).TotalMilliseconds}ms");
var p1start = DateTime.Now;
Part1();
Util.Log($"Q12 part1 took {(DateTime.Now - p1start).TotalMilliseconds}ms");
var p2start = DateTime.Now;
Part2();
Util.Log($"Q12 part2 took {(DateTime.Now - p2start).TotalMilliseconds}ms");
Util.Log($"Q12 took {(DateTime.Now - start).TotalMilliseconds}ms");
}
static void MakeList()
{
foreach (var line in File.ReadAllLines("12input.txt"))
{
instructions.Add(new Tuple<char, int>(line[0], Convert.ToInt32(line[1..]) % 360));
}
}
static void MoveDir(ref Vec2 vec, char dir, int amount)
{
switch (dir)
{
case 'N':
vec.y += amount;
break;
case 'S':
vec.y -= amount;
break;
case 'E':
vec.x += amount;
break;
case 'W':
vec.x -= amount;
break;
default:
throw new Exception("Invalid MoveDir direction");
}
}
static void MoveShipDir(char dir, int amount)
{
MoveDir(ref shipPosition, dir, amount);
}
static void MoveShipToWaypoint(int amount)
{
shipPosition.x += waypointPosition.x * amount;
shipPosition.y += waypointPosition.y * amount;
}
static void MoveWaypointDir(char dir, int amount)
{
MoveDir(ref waypointPosition, dir, amount);
}
static char GetFacingDir()
{
if (facingDir == 0)
{
return 'N';
}
else if (facingDir == 90)
{
return 'E';
}
else if (facingDir == 180)
{
return 'S';
}
else if (facingDir == 270)
{
return 'W';
}
throw new Exception("Invalid facing dir");
}
static void RotateShipDir(char dir, int amount)
{
if (amount % 90 != 0)
{
throw new Exception("Turned toward a non-cardinal direction");
}
if (dir == 'R')
{
facingDir = (facingDir + amount) % 360;
}
else if (dir == 'L')
{
facingDir = (facingDir - amount);
while (facingDir < 0)
{
facingDir = 360 + facingDir;
}
}
else
{
throw new Exception("Invalid rotation dir");
}
}
static void RotateWaypointDir(char dir, int amount)
{
if (amount % 90 != 0)
{
throw new Exception("Turned toward a non-cardinal direction");
}
switch (amount % 360)
{
case 180:
waypointPosition.y = -waypointPosition.y;
waypointPosition.x = -waypointPosition.x;
break;
case 90:
if (dir == 'R')
{
var tmp = waypointPosition.x;
waypointPosition.x = waypointPosition.y;
waypointPosition.y = -tmp;
}
else if (dir == 'L')
{
var tmp = waypointPosition.y;
waypointPosition.y = waypointPosition.x;
waypointPosition.x = -tmp;
}
break;
case 270:
RotateWaypointDir(dir == 'R' ? 'L' : 'R', 90);
break;
default:
throw new Exception("Unexpected waypoint rotation direction");
}
}
static void Part1()
{
foreach (var inst in instructions)
{
switch (inst.Item1)
{
case 'N':
case 'S':
case 'E':
case 'W':
MoveShipDir(inst.Item1, inst.Item2);
break;
case 'F':
MoveShipDir(GetFacingDir(), inst.Item2);
break;
case 'R':
case 'L':
RotateShipDir(inst.Item1, inst.Item2);
break;
}
}
Util.Log($"Q12Part1: finished facing {facingDir}, x={shipPosition.x}, y={shipPosition.y}, manhattan dist={Math.Abs(shipPosition.x) + Math.Abs(shipPosition.y)}");
}
static void Part2()
{
shipPosition = new Vec2();
foreach (var inst in instructions)
{
switch (inst.Item1)
{
case 'N':
case 'S':
case 'E':
case 'W':
MoveWaypointDir(inst.Item1, inst.Item2);
break;
case 'F':
MoveShipToWaypoint(inst.Item2);
break;
case 'R':
case 'L':
RotateWaypointDir(inst.Item1, inst.Item2);
break;
}
}
Util.Log($"Q12Part2: finished facing {facingDir}, x={shipPosition.x}, y={shipPosition.y}, manhattan dist={Math.Abs(shipPosition.x) + Math.Abs(shipPosition.y)}");
}
}
}