public override IEnumerable <object> Solve(TextReader inputStream)
{
const double R = 1e15;
const double RSquared = R * R;
var sw = new Stopwatch();
sw.Start();
var n = inputStream.ReadInt();
var points = new Point[n];
for (int i = 0; i < points.Length; i++)
{
var(x, y) = inputStream.ReadValue <int, int>();
points[i] = new Point(x, y);
}
var counts = new int[n];
var countSum = 0;
var rand = new XorShift();
while (sw.ElapsedMilliseconds < 1850)
{
var min = double.MaxValue;
var index = -1;
unchecked
{
var x = rand.NextDouble() * 2 * R - R;
var y = rand.NextDouble() * 2 * R - R;
if (x * x + y * y <= RSquared)
{
for (int i = 0; i < points.Length; i++)
{
var dist = points[i].GetDistanceSquared(x, y);
if (dist < min)
{
index = i;
min = dist;
}
}
counts[index]++;
countSum++;
}
}
}
foreach (var c in counts)
{
yield return((double)c / countSum);
}
}
public void Annealing(Stopwatch sw)
{
var random = new XorShift();
var count = 0;
var startTime = sw.ElapsedMilliseconds;
var temperature = CalculateTemp(startTime, startTime, TimeLimit);
while (true)
{
if (count++ % 10000 == 0)
{
temperature = CalculateTemp(sw.ElapsedMilliseconds, startTime, TimeLimit);
if (sw.ElapsedMilliseconds >= TimeLimit)
{
break;
}
}
var cardA = random.Next(_takeOrderInv.Length);
var cardB = random.Next(_takeOrderInv.Length);
if (cardA == cardB)
{
continue;
}
var prev = CalculateLocal(cardA, cardB);
Swap(ref _takeOrderInv[cardA], ref _takeOrderInv[cardB]);
Swap(ref _takeOrder[_takeOrderInv[cardA]], ref _takeOrder[_takeOrderInv[cardB]]);
Swap(ref _compressed[cardA], ref _compressed[cardB]);
var next = CalculateLocal(cardA, cardB);
// 大きい方が優秀
var diff = prev - next;
if (!(diff >= 0 || random.NextDouble() <= Math.Exp(diff / temperature)))
{
Swap(ref _takeOrderInv[cardA], ref _takeOrderInv[cardB]);
Swap(ref _takeOrder[_takeOrderInv[cardA]], ref _takeOrder[_takeOrderInv[cardB]]);
Swap(ref _compressed[cardA], ref _compressed[cardB]);
}
}
}
private bool IsAcceptableScore(int lastScore, int newScore, double temperature)
{
return(newScore < Inf && (newScore >= lastScore || _xorShift.NextDouble() < Math.Exp((newScore - lastScore) / temperature)));
}
public override void WithXorShift()
{
XorShift.NextDouble();
}