// add all elements to copy of heap
// takes linear time since already in heap order so no keys move
public HeapIEnumerator(IndexMaxPQ <Key> maxpq)
{
innerPQ = new IndexMaxPQ <Key>(maxpq.Count);
for (int i = 1; i <= maxpq.N; i++)
{
innerPQ.Insert(maxpq.pq[i], maxpq.keys[maxpq.pq[i]]);
}
copy = innerPQ;
}
public static void MainTest(string[] args)
{
// insert a bunch of strings
string[] strings = { "it", "was", "the", "best", "of", "times", "it", "was", "the", "worst" };
IndexMaxPQ <string> pq = new IndexMaxPQ <string>(strings.Length);
for (int i = 0; i < strings.Length; i++)
{
pq.Insert(i, strings[i]);
}
// print each key using the iterator
foreach (int i in pq)
{
Console.WriteLine(i + " " + strings[i]);
}
Console.WriteLine();
// increase or decrease the key
for (int i = 0; i < strings.Length; i++)
{
if (StdRandom.Uniform() < 0.5)
{
pq.IncreaseKey(i, strings[i] + strings[i]);
}
else
{
pq.DecreaseKey(i, strings[i].Substring(0, 1));
}
}
// delete and print each key
while (!pq.IsEmpty)
{
string key = pq.MaxKey;
int i = pq.DelMax();
Console.WriteLine(i + " " + key);
}
Console.WriteLine();
// reinsert the same strings
for (int i = 0; i < strings.Length; i++)
{
pq.Insert(i, strings[i]);
}
Console.WriteLine("Deleting in randome order");
// delete them in random order
int[] perm = new int[strings.Length];
for (int i = 0; i < strings.Length; i++)
{
perm[i] = i;
}
StdRandom.Shuffle(perm);
for (int i = 0; i < perm.Length; i++)
{
string key = pq.KeyOf(perm[i]);
pq.Delete(perm[i]);
Console.WriteLine(perm[i] + " " + key);
}
}
public void Reset()
{
innerPQ = copy;
}
