protected override void Solve(out string answer)
{
PentagonManager pentagonManager = new PentagonManager();
//Generate numbers up to 5000
long maxCount = 5000;
foreach (long j in Enumerable64.Range(1, maxCount))
{
PentagonNumber pj = new PentagonNumber(j);
pentagonManager.Add(pj);
}
long count = maxCount * maxCount;
long progressDone = 0;
//Create all pairs 5000x5000
Parallelization.GetParallelRanges(1, maxCount, 50).ForAll(sequence =>
{
foreach (long j in sequence)
{
foreach (long k in Enumerable64.Range(1, maxCount))
{
PentagonPair pjk = pentagonManager.CreatePair(j, k);
if (pentagonManager.IsSumPentagonal(pjk))
{
if (pentagonManager.IsDifPentagonal(pjk))
{
lock (pentagonManager)
{
pentagonManager.StorePair(pjk);
}
}
}
lock (this)
{
progressDone++;
if (progressDone % 100_000 == 0)
{
int percent = (int)(progressDone * 100.0 / count);
UpdateProgress($"Pairs checked out of {count}: Done {percent}%. Hits: {pentagonManager.storedPairs.Count}...");
}
}
}
}
});
var solution = pentagonManager.storedPairs.OrderBy(pair => pair.AbsDifValue).First();
answer = $"Candiates = {pentagonManager.storedPairs.Count}, D = {solution.AbsDifValue}.";
}
internal void Add(PentagonNumber pj)
{
dictionary.Add(pj.Number, pj);
}
public PentagonPair(PentagonNumber pj, PentagonNumber pk)
{
Pj = pj;
Pk = pk;
}
