private static IEnumerable <int> CreateNewCoinList(int coin, ChangeOption existingChangeOption)
{
List <int> newCoinList = new List <int>();
newCoinList.AddRange(existingChangeOption.ChangeCoins);
newCoinList.Add(coin);
return(newCoinList);
}
public void AddChangeOption(int targetValue, IEnumerable <int> changeCoins)
{
var newChangeOption = new ChangeOption(targetValue);
foreach (var changeCoin in changeCoins)
{
newChangeOption.AddChangeCoin(changeCoin);
}
changeOptionDictionary.Add(targetValue, newChangeOption);
}
private static bool NewChangeOptionIsShorter(ChangeOption existingChangeOption, ChangeOption changeOption)
{
return(existingChangeOption.ChangeCoins.Count > changeOption.ChangeCoins.Count + 1);
}
private static void UpdateChangeOption(ChangeOptionList possibleChangeOptions, int targetValue, int coin, ChangeOption existingChangeOption)
{
var newCoinList = CreateNewCoinList(coin, existingChangeOption);
if (!possibleChangeOptions.ChangeOptionExistsForTargetValue(targetValue))
{
possibleChangeOptions.AddChangeOption(targetValue, newCoinList);
}
else
{
possibleChangeOptions.GetChangeOption(targetValue).SetChangeCoins(newCoinList);
}
}
private static bool ExistingChangeOptionShouldBeUpdated(ChangeOptionList existingChangeOptions, int subtarget, ChangeOption newChangeOption)
{
return(newChangeOption != null &&
(!existingChangeOptions.ChangeOptionExistsForTargetValue(subtarget) || NewChangeOptionIsShorter(existingChangeOptions.GetChangeOption(subtarget), newChangeOption)));
}