/**
* Checks if a combo exists in this numberList.
* @param startIndex the index to check from
* @param target the target to reach
* @return true if combo exists, false otherwise.
*/
public bool CheckForComboAt(int startIndex, int target)
{
RefreshArray();
// SumList objects store a sum and the index they're found on.
SumList sumListLeft = new SumList(), sumListRight = new SumList();
sumListLeft.Add(0, -1);
sumListRight.Add(0, -1);
/**
* Disregard all the numbers that cannot be part of the combo and return
* the shorter array with numbers that can.
*/
ShortList sl = FindShortList(startIndex, target);
NumberNode[] shortList = sl.array;
// Set the index to start counting from for counting towards
// left and counting towards right.
int leftStartIndex = sl.GetStartIndex();
int rightStartIndex = sl.GetStartIndex() + 1;
// Create a temporary sum.
int sum = 0;
// Go over all numbers in the short list left of (and including) the start index
for (int i = leftStartIndex; i > -1; i--)
{
// Increase the sum by the current value
sum += shortList[i].value;
// Store the sum and at what index in the shortList the sum occured
sumListLeft.Add(sum, i);
}
// Reset the temporary sum.
sum = 0;
// Go over all numbers in the short list right of (and excluding) the start index
for (int i = rightStartIndex; i < shortList.Length; i++)
{
// Increase the sum by the current value
sum += shortList[i].value;
// Store the sum and at what index in the shortList the sum occured
sumListRight.Add(sum, i);
}
// For both sumlists...
for (int sumListLeftIndex = 0; sumListLeftIndex < sumListLeft.sumList.Count; sumListLeftIndex++)
{
for (int sumListRightIndex = 0; sumListRightIndex < sumListRight.sumList.Count; sumListRightIndex++)
{
// Get the value of the currently selected sums added together
int current_sum = sumListLeft.sumList[sumListLeftIndex] + sumListRight.sumList[sumListRightIndex];
if (current_sum == target)
{
// Found a combo!
// Kill all nodes that make up this combination.
for (int k = 0; k < sumListLeftIndex + 1; k++)
{
int index = sumListLeft.indexList[k];
if (index > -1)
{
shortList[index].Kill();
}
}
for (int k = 0; k < sumListRightIndex + 1; k++)
{
int index = sumListRight.indexList[k];
if (index > -1)
{
shortList[index].Kill();
}
}
return(true);
}
// If the combined sum is above it's target, no combo can be found, so
// stop looking any further.
else if (current_sum > target)
{
return(false);
}
}
}
return(false);
}