public void Insert(Symbols sym)
{
if (heapSize - 1 >= capacity)
{
Console.WriteLine("exceeded the capcaity of the heap");
}
else
{
//weights[heapSize] = n;
symbols[heapSize] = sym;
// symbols[heapSize].symbol = sy ;
// symbols[heapSize].weight = wt;
int childIndex = heapSize;
int parentIndex = GetParent(childIndex);
while (childIndex > 0 && symbols[childIndex].weight < symbols[parentIndex].weight)
{
Swap(childIndex, parentIndex);
childIndex = parentIndex;
parentIndex = GetParent(childIndex);
}
heapSize++;
}
}
static void Main(string[] args)
{
string path = Directory.GetCurrentDirectory() + @"\huffman.txt";;
string[] lines = File.ReadAllLines(path);
int noOfSymbols = lines.Length;
MinHeap heapWeights = new MinHeap(noOfSymbols);
int[] noOfMergers = new int[noOfSymbols];
int index = 0;
foreach (var line in lines)
{
Symbols sym = new Symbols(index, Convert.ToInt32(line), null, null);
heapWeights.Insert(sym);
index++;
}
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
int[] arr = new int[10500];
//for (int i = 0; i < noOfSymbols - 1; i++)
//{
// Symbols minSymbol1 = heapWeights.ExtractMin();
// Symbols minSymbol2 = heapWeights.ExtractMin();
// if (metaSymbols[minSymbol1.symbol] != null)
// {
// foreach (var s in metaSymbols[minSymbol1.symbol].subsymbols)
// {
// noOfMergers[s]++;
// }
// }
// if (metaSymbols[minSymbol2.symbol] != null)
// {
// foreach (var s in metaSymbols[minSymbol2.symbol].subsymbols)
// {
// noOfMergers[s]++;
// }
// }
// noOfMergers[minSymbol1.symbol]++;
// noOfMergers[minSymbol2.symbol]++;
// Symbols minMergeSymbol = new Symbols(minSymbol2.symbol, minSymbol1.weight + minSymbol2.weight);
// minMergeSymbol.weight = minSymbol1.weight + minSymbol2.weight;
// minMergeSymbol.symbol = minSymbol2.symbol;
// if (metaSymbols[minSymbol2.symbol] == null)
// {
// metaSymbols[minSymbol2.symbol] = new MetaSymbols();
// }
// metaSymbols[minSymbol2.symbol].subsymbols.Add(minSymbol1.symbol);
// if (metaSymbols[minSymbol1.symbol] != null)
// {
// metaSymbols[minSymbol2.symbol].subsymbols.AddRange(metaSymbols[minSymbol1.symbol].subsymbols);
// metaSymbols[minSymbol1.symbol].subsymbols = null;
// }
// heapWeights.Insert(minMergeSymbol.symbol, minMergeSymbol.weight);
//}
int noOfMerges = 0;
int ind = 0;
Merge();
void Merge()
{
if (heapWeights.heapSize > 1)
{
Symbols minSymbol1 = heapWeights.ExtractMin();
Symbols minSymbol2 = heapWeights.ExtractMin();
Symbols minMergeSymbol = new Symbols(-1, minSymbol1.weight + minSymbol2.weight, minSymbol1, minSymbol2);
heapWeights.Insert(minMergeSymbol);
noOfMerges++;
Merge();
}
else
{
PrintCodes(heapWeights.ExtractMin());
}
}
void PrintCodes(Symbols root)
{
if (root.left != null)
{
arr[ind] = 0;
ind++;
PrintCodes(root.left);
}
if (root.right != null)
{
arr[ind] = 1;
ind++;
PrintCodes(root.right);
}
if (root.left == null && root.right == null)
{
Console.WriteLine("the symbol is {0}", root.symbol);
for (int i = 0; i < ind; i++)
{
Console.Write("{0}", arr[i]);
}
Console.WriteLine("code length is {0}", ind);
Console.WriteLine();
}
ind = ind - 1;
}
QuickSort(0, noOfSymbols - 1);
void QuickSort(int start_pos, int last_pos)
{
int len = last_pos - start_pos + 1;
if (len > 1)
{
int i = start_pos;
int pivot = noOfMergers[start_pos];
for (int j = start_pos + 1; j <= last_pos; j++)
{
if (noOfMergers[j] < pivot)
{
Swap(i + 1, j);
i++;
}
}
Swap(i, start_pos);
QuickSort(start_pos, i - 1);
QuickSort(i + 1, last_pos);
}
}
void Swap(int i, int j)
{
int temp = noOfMergers[i];
noOfMergers[i] = noOfMergers[j];
noOfMergers[j] = temp;
}
Console.WriteLine("maximum length of encoding is {0}", noOfMergers[noOfSymbols - 1]);
Console.WriteLine("minimum length of encoding is {0}", noOfMergers[0]);
Console.WriteLine("time taken is {0}", stopwatch.ElapsedMilliseconds);
Console.ReadKey();
}