-
Notifications
You must be signed in to change notification settings - Fork 0
/
19.linq
129 lines (119 loc) · 3.66 KB
/
19.linq
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
<Query Kind="Program" />
char[,] _grid;
int _xMax = 0;
int _yMax = 0;
void Main()
{
Directory.SetCurrentDirectory(Path.GetDirectoryName(Util.CurrentQueryPath));
string[] steps = File.ReadAllLines("19.txt");
_yMax = steps.Length;
_xMax = steps.First().Length;
_grid = new char[_yMax, _xMax];
int currentX = 0;
int currentY = 0;
List<char> seen = new List<char>();
Direction direction = Direction.South;
for (int y = 0; y < _yMax; y++)
{
for (int x = 0; x < _xMax; x++)
{
_grid[y,x] = steps[y][x];
if (y == 0 && _grid[y,x] == '|') currentX = x;
}
}
int counter = 0;
while (true)
{
counter++;
char c = _grid[currentY, currentX];
if (char.IsLetter(c))
{
seen.Add(c);
if (c == 'U')
{
$"P1: {new string(seen.ToArray())}".Dump();
$"P2: {counter}".Dump();
return;
}
}
if (c == '+')
{
switch (direction)
{
case Direction.North:
if (currentX > 0 && (_grid[currentY, currentX-1] == '-' || char.IsLetter(_grid[currentY, currentX-1])))
{
currentX--;
direction = Direction.West;
}
else
{
currentX++;
direction = Direction.East;
}
break;
case Direction.South:
if (currentX > 0 && (_grid[currentY, currentX-1] == '-' || char.IsLetter(_grid[currentY, currentX-1])))
{
currentX--;
direction = Direction.West;
}
else
{
currentX++;
direction = Direction.East;
}
break;
case Direction.East:
if (currentY > 0 && (_grid[currentY - 1, currentX] == '|' || char.IsLetter(_grid[currentY-1, currentX])))
{
currentY--;
direction = Direction.North;
}
else
{
currentY++;
direction = Direction.South;
}
break;
case Direction.West:
if (currentX > 0 && (_grid[currentY - 1, currentX] == '|' || char.IsLetter(_grid[currentY-1, currentX])))
{
currentY--;
direction = Direction.North;
}
else
{
currentY++;
direction = Direction.South;
}
break;
}
}
else
{
switch (direction)
{
case Direction.North:
currentY--;
break;
case Direction.South:
currentY++;
break;
case Direction.East:
currentX++;
break;
case Direction.West:
currentX--;
break;
}
}
}
}
public enum Direction
{
North,
South,
East,
West
}