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www.mikescher.com/www/statics/aoc/2018/23-2.linq

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2019-11-02 20:19:34 +01:00
<Query Kind="Statements" />
class C3 { public long X, Y, Z; }
void Main()
{
var input = File.ReadAllLines(Path.Combine(Path.GetDirectoryName(Util.CurrentQueryPath), @"23_input.txt"))
.Where(p => !string.IsNullOrWhiteSpace(p))
.Select(p => new
{
X = long.Parse(p.Split(' ')[0].Substring(5).Split(',')[0].Trim(new[] { ' ', '<', '>', ',' })),
Y = long.Parse(p.Split(' ')[0].Substring(5).Split(',')[1].Trim(new[] { ' ', '<', '>', ',' })),
Z = long.Parse(p.Split(' ')[0].Substring(5).Split(',')[2].Trim(new[] { ' ', '<', '>', ',' })),
R = long.Parse(p.Split(' ')[1].Substring(2).Trim(new[] { ' ', '<', '>', ',' })),
})
.ToList();
var x_min = input.Min(i => i.X);
var x_max = input.Max(i => i.X);
var y_min = input.Min(i => i.Y);
var y_max = input.Max(i => i.Y);
var z_min = input.Min(i => i.Z);
var z_max = input.Max(i => i.Z);
long dist = 1;
for (; dist < x_max - x_min; dist *= 2) ;
long target_count = 0;
C3 best = null;
long? best_val = null;
for (; dist > 0;)
{
target_count = 0;
best = null;
best_val = null;
for (long x = x_min; x <= x_max; x += dist)
{
for (long y = y_min; y <= y_max; y += dist)
{
for (long z = z_min; z <= z_max; z += dist)
{
var count = 0;
foreach (var b in input)
{
var calc = Math.Abs(x - b.X) + Math.Abs(y - b.Y) + Math.Abs(z - b.Z);
if ((calc - b.R) / dist <= 0) count++;
}
if (count > target_count)
{
target_count = count;
best_val = Math.Abs(x) + Math.Abs(y) + Math.Abs(z);
best = new C3 { X = x, Y = y, Z = z };
}
else if (count == target_count)
{
if (Math.Abs(x) + Math.Abs(y) + Math.Abs(z) < best_val)
{
best_val = Math.Abs(x) + Math.Abs(y) + Math.Abs(z);
best = new C3 { X = x, Y = y, Z = z };
}
}
}
}
}
x_min = best.X - dist;
x_max = best.X + dist;
y_min = best.Y - dist;
y_max = best.Y + dist;
z_min = best.Z - dist;
z_max = best.Z + dist;
dist /= 2;
}
best_val.Dump();
}