/// <summary>
/// Uses optimises calculation for TotalCoin combinations
/// because we know we only have Units in our set of coins
/// that are successive multiples - e.g., 8,4,2,1 ...
/// so can be optimized to avoid division.
/// only triggers when the lowest unit fires and
/// when our startingPoint = unitSum = '15' in above example
/// is reached.
/// Stores results in large array provided. The implementation could be
/// better de-coupled ... but this is efficient.
/// </summary>
/// <param name="source">value to calculate</param>
/// <<param name="maximumCoins">max coins to generate</param>
/// <param name="newNumberOfCoins"></param>
/// <returns>Number of combinations found</returns>
/// <exception cref="Exception">Exception if internal number of Tickers happens to be wrong ... shouldn;t happen</exception>
public override Int64 Calculate(int source, int maximumCoins, Int64[] newNumberOfCoins)
{
Int64 cnt = 0;
if (source >= unitSum && source % lowestFactor == 0)
{
var vals = ValuesAndMultiplesForEvenFactors.GenerateValuesAndMultiplesRecursive(coin, source).ToList();
if (vals.Count() == 7)
{
cnt = CoinsForEvenFactors.CalculateTotalCoinsForEachComboAndReturnCount(newNumberOfCoins, maximumCoins, source, vals[0], vals[1], vals[2], vals[3], vals[4], vals[5], vals[6]);
}
else if (vals.Count() == 6)
{
cnt = CoinsForEvenFactors.CalculateTotalCoinsForEachComboAndReturnCount(newNumberOfCoins, maximumCoins, source, vals[0], vals[1], vals[2], vals[3], vals[4], vals[5]);
}
else if (vals.Count() == 5)
{
cnt = CoinsForEvenFactors.CalculateTotalCoinsForEachComboAndReturnCount(newNumberOfCoins, maximumCoins, source, vals[0], vals[1], vals[2], vals[3], vals[4]);
}
else if (vals.Count() == 4)
{
cnt = CoinsForEvenFactors.CalculateTotalCoinsForEachComboAndReturnCount(newNumberOfCoins, maximumCoins, source, vals[0], vals[1], vals[2], vals[3]);
}
else if (vals.Count() == 3)
{
cnt = CoinsForEvenFactors.CalculateTotalCoinsForEachComboAndReturnCount(newNumberOfCoins, maximumCoins, source, vals[0], vals[1], vals[2]);
}
else if (vals.Count() == 2)
{
cnt = CoinsForEvenFactors.CalculateTotalCoinsForEachComboAndReturnCount(newNumberOfCoins, maximumCoins, source, vals[0], vals[1]);
}
else if (vals.Count() == 1)
{
cnt = CoinsForEvenFactors.CalculateTotalCoinsForEachComboAndReturnCount(newNumberOfCoins, maximumCoins, source, vals[0]);
}
else
{
throw new Exception($"Unexpected number of values initialized - {vals.Count} > 7");
}
}
return(cnt);
}
public static IEnumerable <Int64> Generate(CoinsLib.CombinationCalculator.Coin foo, int value, int max = 10000)
{
var arr = new Int64[value];
var g = ValuesAndMultiplesForEvenFactors.GenerateValuesAndMultiplesRecursive(foo, value).ToArray();
if (g.Length == 7)
{
CoinsForEvenFactors.CalculateTotalCoinsForEachComboAndReturnCount(arr, max, value, g[0], g[1], g[2], g[3], g[4], g[5], g[6]);
}
if (g.Length == 6)
{
CoinsForEvenFactors.CalculateTotalCoinsForEachComboAndReturnCount(arr, max, value, g[0], g[1], g[2], g[3], g[4], g[5]);
}
if (g.Length == 5)
{
CoinsForEvenFactors.CalculateTotalCoinsForEachComboAndReturnCount(arr, max, value, g[0], g[1], g[2], g[3], g[4]);
}
if (g.Length == 4)
{
CoinsForEvenFactors.CalculateTotalCoinsForEachComboAndReturnCount(arr, max, value, g[0], g[1], g[2], g[3]);
}
if (g.Length == 3)
{
CoinsForEvenFactors.CalculateTotalCoinsForEachComboAndReturnCount(arr, max, value, g[0], g[1], g[2]);
}
if (g.Length == 2)
{
CoinsForEvenFactors.CalculateTotalCoinsForEachComboAndReturnCount(arr, max, value, g[0], g[1]);
}
if (g.Length == 1)
{
CoinsForEvenFactors.CalculateTotalCoinsForEachComboAndReturnCount(arr, max, value, g[0]);
}
return(arr);
}