public void AddNum(int num)
{
_minIntHeap.Push(num);
_maxIntHeap.Push(_minIntHeap.Pop());
if (_minIntHeap.GetSize() < _maxIntHeap.GetSize())
{
_minIntHeap.Push(_maxIntHeap.Pop());
}
}
public IList <string> TopKFrequent(string[] words, int k)
{
var result = new List <string>();
var heap = new MaxIntHeap(words.Length);
var dictionary = BuildFrequencyDictionary(words);
foreach (var pair in dictionary)
{
heap.Push(pair);
}
while (k > 0)
{
var nextResult = heap.Pop();
result.Add(nextResult.Key + " " + nextResult.Value);
k--;
}
return(result);
}
public IList <IList <int> > GetSkyline(int[][] buildings)
{
var result = new List <IList <int> >();
int[] x2Buildings = new int[buildings.GetLength(0)], heights = new int[buildings.GetLength(0)];
for (int i = 0; i < x2Buildings.Length; i++)
{
x2Buildings[i] = buildings[i][1]; heights[i] = buildings[i][2];
}
Array.Sort(x2Buildings, heights); //Sort x2 and height seqences
int[,] xAll = new int[buildings.GetLength(0) * 2, 3]; //0: x, 1: height, 2: left/right
for (int i = 0, j = 0; i < buildings.GetLength(0) || j < x2Buildings.Length;)
{ // Merging Sort all edges
int x1 = i < buildings.Length ? buildings[i][0] : int.MaxValue;
int x2 = j < x2Buildings.Length ? x2Buildings[j] : int.MaxValue;
if (j == x2Buildings.Length || i < buildings.GetLength(0) && x1 <= x2)
{
xAll[i + j, 0] = buildings[i][0];
xAll[i + j, 1] = buildings[i][2];
xAll[i + j, 2] = 0;
i++;
}
else
{
xAll[i + j, 0] = x2Buildings[j];
xAll[i + j, 1] = heights[j];
xAll[i + j, 2] = 1;
j++;
}
}
var curHeights = new Dictionary <int, int>();
var sH = new MaxIntHeap();
for (int i = 0; i < xAll.GetLength(0); i++)
{
if (xAll[i, 2] == 0)
{
curHeights[xAll[i, 1]] = curHeights.ContainsKey(xAll[i, 1]) ? curHeights[xAll[i, 1]] + 1 : 1;
sH.Push(xAll[i, 1]);
}
else
{
if (curHeights[xAll[i, 1]] > 1)
{
curHeights[xAll[i, 1]]--;
}
else
{
curHeights.Remove(xAll[i, 1]);
sH.Push(xAll[i, 1]);
}
}
int curMaxHeight = curHeights.Count == 0 ? 0 : sH.Peek();
if (result.Count > 0 && result[result.Count - 1][1] == curMaxHeight)
{
continue;
}
else if (result.Count > 0 && result[result.Count - 1][0] == xAll[i, 0])
{
result[result.Count - 1][1] = curMaxHeight;
}
else
{
result.Add(new int[] { xAll[i, 0], curMaxHeight });
}
}
return(result);
}