public static void ShaoMiaoExit(List<AHT> listAHT, AHT cur, List<int[]> solutionlist)
{
int hight = 0;
int right = 0;
foreach (var aht in listAHT)
{
if (aht.right >= right)
{
right = aht.right;
if (aht.hight > cur.hight && right > cur.left)
{
hight = aht.hight;
}
}
}
for (int i = listAHT.Count - 1; i >= 0; i--)
{
if (listAHT[i].right < cur.left)
{
listAHT.Remove(listAHT[i]);
}
}
solutionlist.Add(new int[] { right, hight });
}
/// <summary>
/// 利用扫描线算法
/// </summary>
/// <param name="buildings"></param>
/// <returns></returns>
public static IList<int[]> GetSkyline2(int[,] buildings)
{
List<int[]> solutionlist = new List<int[]>();
List<int[]> LastSolutionlist = new List<int[]>();
if (buildings == null)
return solutionlist;
if (buildings.Length == 0)
{
return solutionlist;
}
List<AHT> listAHT = new List<AHT>();
solutionlist.Add(new int[] { buildings[0, 0], buildings[0, 2] });
AHT aht = new AHT();
aht.left = buildings[0, 0];
aht.right = buildings[0, 1];
aht.hight = buildings[0, 2];
listAHT.Add(aht);
var maxRigth = aht.right;
for (int i = 1; i < buildings.GetLength(0); i++)
{
aht = new AHT();
aht.left = buildings[i, 0];
aht.right = buildings[i, 1];
aht.hight = buildings[i, 2];
if (maxRigth < aht.right)
{
maxRigth = aht.right;
}
ShaoMiaoEntrance(listAHT, aht, solutionlist);
}
solutionlist.Add(new int[] { maxRigth, 0 });
for (int i = 0; i < solutionlist.Count; i++)
{
if (i != 0 && solutionlist[i][1] == solutionlist[i - 1][1])
{
continue;
}
//if (i == solutionlist.Count - 1 && solutionlist[i][0] == solutionlist[i - 1][0])
//{
// LastSolutionlist[LastSolutionlist.Count - 1][1] = 0;
//}
if (i != 0 && solutionlist[i][0] == LastSolutionlist[LastSolutionlist.Count - 1][0])
{
if (i == solutionlist.Count - 1)
{
if (LastSolutionlist[LastSolutionlist.Count - 1][0] == solutionlist[i - 1][0])
{
LastSolutionlist[LastSolutionlist.Count - 1][1] = 0;
continue;
}
}
else if (solutionlist[i][1] > solutionlist[i - 1][1])
{
LastSolutionlist[LastSolutionlist.Count - 1][1] = solutionlist[i][1];
continue;
}
else
{
continue;
}
}
LastSolutionlist.Add(solutionlist[i]);
}
return LastSolutionlist;
}
public static void ShaoMiaoEntrance(List<AHT> listAHT, AHT cur, List<int[]> solutionlist)
{
int hight = cur.hight;
int left = cur.left;
int current = 0;
while (current < listAHT.Count)
{
if (listAHT[current].right >= left)
{
if (listAHT[current].right > cur.right)
{
if (listAHT[current].hight > hight)
{
hight = listAHT[current].hight;
left = listAHT[current].right;
}
}
else
{
if (listAHT[current].hight > hight)
{
left = listAHT[current].right;
}
}
}
//产生拐点
if (listAHT[current].right < cur.left)
{
ShaoMiaoExit(listAHT, cur, solutionlist);
}
current++;
}
solutionlist.Add(new int[] { left, hight });
listAHT.Add(cur);
}