public void IndexPQDeleteAtIndexTest()
{
var pq = new IndexMaxPQ <String>(array);
Assert.True(pq.Contains(5));
pq.Delete(5);
Assert.False(pq.Contains(5));
try
{
pq.Delete(5);
}
catch (Exception ex)
{
Assert.IsType <InvalidOperationException>(ex);
Assert.Equal("index is not in the priority queue", ex.Message);
}
}
public void IndexMaxPQTest1()
{
const int MaxSize = 8;
const double MinValue = 3.9;
const double MaxValue = MinValue * MaxSize + 32;
int index;
// MaxValue index == 3, MinValue index == 4
double[] items = { MinValue * 2, MinValue * 3, MinValue * 4, MaxValue, MinValue, MinValue * 5, MinValue * 6, MinValue * 7 };
StdRandom.Seed = 101;
IndexMaxPQ <double> pq = new IndexMaxPQ <double>(MaxSize);
index = StdRandom.Uniform(items.Length);
Assert.IsFalse(pq.Contains(index));
Assert.IsTrue(pq.IsEmpty);
Assert.AreEqual(0, pq.Count);
try
{
index = pq.DelMax();
Assert.Fail("Failed to catch exception");
}
catch (InvalidOperationException) { }
for (int i = 0; i < items.Length; i++)
{
pq.Insert(i, items[i]);
}
Assert.AreEqual(items.Length, pq.Count);
Assert.AreEqual(MaxValue, pq.MaxKey);
Assert.AreEqual(3, pq.MaxIndex);
Assert.AreEqual(MinValue, pq.KeyOf(4));
index = StdRandom.Uniform(items.Length);
Assert.AreEqual(items[index], pq.KeyOf(index));
pq.ChangeKey(1, pq.MaxKey * 1.9); // make it the largest item
Assert.AreEqual(1, pq.MaxIndex);
pq.IncreaseKey(3, pq.MaxKey * 1.87);
Assert.AreEqual(3, pq.MaxIndex);
pq.Delete(3);
Assert.AreNotEqual(3, pq.MaxIndex);
Assert.AreEqual(1, pq.DelMax());
}