public void NeedBalancingLL()
{
var tree = new RedBlackTree();
tree.Insert(5);
tree.Insert(4);
tree.Insert(3);
tree.Insert(2);
tree.Insert(1);
Assert.True(tree.Contains(1));
Assert.True(tree.Contains(2));
Assert.True(tree.Contains(3));
Assert.True(tree.Contains(4));
Assert.True(tree.Contains(5));
Assert.Equal(4, tree._root.Value);
Assert.Equal(RedBlackTree.Color.Black, tree._root.Color);
Assert.Equal(2, tree._root.Left.Value);
Assert.Equal(RedBlackTree.Color.Black, tree._root.Left.Color);
Assert.Equal(5, tree._root.Right.Value);
Assert.Equal(RedBlackTree.Color.Black, tree._root.Right.Color);
Assert.Equal(1, tree._root.Left.Left.Value);
Assert.Equal(RedBlackTree.Color.Red, tree._root.Left.Left.Color);
Assert.Equal(3, tree._root.Left.Right.Value);
Assert.Equal(RedBlackTree.Color.Red, tree._root.Left.Right.Color);
}
public void Contains_EmptyTree_ReturnsFalse()
{
var tree = new RedBlackTree <int>();
tree.Contains(5).Should().BeFalse();
tree.Contains(-12).Should().BeFalse();
}
public void NeedBalancingLR()
{
var tree = new RedBlackTree();
tree.Insert(1);
tree.Insert(2);
tree.Insert(5);
tree.Insert(3);
// https://neerc.ifmo.ru/wiki/index.php?title=%D0%9A%D1%80%D0%B0%D1%81%D0%BD%D0%BE-%D1%87%D0%B5%D1%80%D0%BD%D0%BE%D0%B5_%D0%B4%D0%B5%D1%80%D0%B5%D0%B2%D0%BE
// SimpleBalancing - без поворотов
// rrBalancing, значит нужно балансировать ноду которая правая для родителя и у родитель которой также правый для своего родителя(первая r - правость родителя, вторая - ноды)
tree.Insert(4);
Assert.True(tree.Contains(1));
Assert.True(tree.Contains(2));
Assert.True(tree.Contains(3));
Assert.True(tree.Contains(4));
Assert.True(tree.Contains(5));
Assert.Equal(2, tree._root.Value);
Assert.Equal(RedBlackTree.Color.Black, tree._root.Color);
Assert.Equal(1, tree._root.Left.Value);
Assert.Equal(RedBlackTree.Color.Black, tree._root.Left.Color);
Assert.Equal(4, tree._root.Right.Value);
Assert.Equal(RedBlackTree.Color.Black, tree._root.Right.Color);
Assert.Equal(3, tree._root.Right.Left.Value);
Assert.Equal(RedBlackTree.Color.Red, tree._root.Right.Left.Color);
Assert.Equal(5, tree._root.Right.Right.Value);
Assert.Equal(RedBlackTree.Color.Red, tree._root.Right.Right.Color);
}
public void Contains_CorrectReturn()
{
var tree = new RedBlackTree <int>();
tree.AddRange(new[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 });
tree.Contains(3).Should().BeTrue();
tree.Contains(7).Should().BeTrue();
tree.Contains(24).Should().BeFalse();
tree.Contains(-1).Should().BeFalse();
}
public void Test_Contains()
{
var bst = new RedBlackTree <Byte, Char>();
bst.Add(1, 'A');
bst.Add(2, 'B');
Assert.True(bst.Contains(1));
Assert.True(bst.Contains(2));
}
public void TestContains()
{
var testTree = new RedBlackTree <int>();
var hasOne = testTree.Contains(1);
Assert.AreEqual(false, hasOne);
testTree.Insert(1);
var hasOneAfterInsert = testTree.Contains(1);
Assert.AreEqual(true, hasOneAfterInsert);
}
public void InsertInRoot__InRightRootChild()
{
var tree = new RedBlackTree();
tree.Insert(1);
tree.Insert(2);
Assert.True(tree.Contains(1));
Assert.True(tree.Contains(2));
Assert.Equal(1, tree._root.Value);
Assert.Equal(RedBlackTree.Color.Black, tree._root.Color);
Assert.Equal(2, tree._root.Right.Value);
Assert.Equal(RedBlackTree.Color.Red, tree._root.Right.Color);
}
public void MassInsert__MassDelete()
{
var insert = Enumerable.Range(0, 1000).ToArray();
var delete = insert.Take(100).ToArray();
var tree = new RedBlackTree();
foreach (var item in insert)
{
tree.Insert(item);
tree.Insert(item);
}
foreach (var item in delete)
{
tree.Remove(item);
}
foreach (var item in insert.Except(delete))
{
Assert.True(tree.Contains(item));
}
foreach (var item in tree)
{
_testOutputHelper.WriteLine(item.ToString());
}
Assert.True(tree.IsValid());
}
public void Remove_Case3_TreeStillValid()
{
// Move to case 6
var tree = new RedBlackTree <int>();
tree.AddRange(new[] { 7, 3, 18, 1, 10, 22, 8, 11, 26 });
tree.Remove(1);
tree.Remove(3);
tree.Count.Should().Be(7);
tree.Contains(3).Should().BeFalse();
tree.GetKeysInOrder().SequenceEqual(new[] { 7, 8, 10, 11, 18, 22, 26 }).Should().BeTrue();
tree.GetKeysPreOrder().SequenceEqual(new[] { 18, 10, 7, 8, 11, 22, 26 }).Should().BeTrue();
// Move to case 5
tree = new RedBlackTree <int>();
tree.AddRange(new[] { 8, 3, 2, 0, 9, 4, 7, 6, 1, 5 });
tree.Remove(8);
tree.Remove(6);
tree.Remove(9);
tree.Count.Should().Be(7);
tree.GetKeysInOrder().SequenceEqual(new[] { 0, 1, 2, 3, 4, 5, 7 }).Should().BeTrue();
tree.GetKeysPreOrder().SequenceEqual(new[] { 3, 1, 0, 2, 5, 4, 7 }).Should().BeTrue();
// Move to case 4
tree = new RedBlackTree <int>();
tree.AddRange(new[] { 7, 5, 8, 4, 6, 3, 2, 9, 0, 1 });
tree.Remove(9);
tree.Remove(6);
tree.Remove(5);
tree.Remove(8);
tree.Count.Should().Be(6);
tree.GetKeysInOrder().SequenceEqual(new[] { 0, 1, 2, 3, 4, 7 }).Should().BeTrue();
tree.GetKeysPreOrder().SequenceEqual(new[] { 3, 1, 0, 2, 7, 4 }).Should().BeTrue();
}
public void Remove_Case5_TreeStillValid()
{
var tree = new RedBlackTree <int>();
tree.AddRange(new[] { 13, 8, 17, 1, 11, 15, 25, 6, 22, 27 });
tree.Remove(8);
tree.Count.Should().Be(9);
tree.Contains(8).Should().BeFalse();
tree.GetKeysInOrder().SequenceEqual(new[] { 1, 6, 11, 13, 15, 17, 22, 25, 27 }).Should().BeTrue();
tree.GetKeysPreOrder().SequenceEqual(new[] { 13, 6, 1, 11, 17, 15, 25, 22, 27 }).Should().BeTrue();
tree = new RedBlackTree <int>();
tree.AddRange(new[] { 13, 8, 17, 1, 11, 15, 25, 0, 6, 22 });
tree.Remove(13);
tree.Count.Should().Be(9);
tree.Contains(13).Should().BeFalse();
tree.GetKeysInOrder().SequenceEqual(new[] { 0, 1, 6, 8, 11, 15, 17, 22, 25 }).Should().BeTrue();
tree.GetKeysPreOrder().SequenceEqual(new[] { 15, 8, 1, 0, 6, 11, 22, 17, 25 }).Should().BeTrue();
tree = new RedBlackTree <int>();
tree.AddRange(new[] { 7, 0, 1, 4, 8, 2, 3, 6, 5, 9 });
tree.Remove(7);
tree.Remove(0);
tree.Remove(1);
tree.Remove(4);
tree.Remove(8);
tree.GetKeysInOrder().SequenceEqual(new[] { 2, 3, 5, 6, 9 }).Should().BeTrue();
tree.GetKeysPreOrder().SequenceEqual(new[] { 3, 2, 6, 5, 9 }).Should().BeTrue();
}
public void InsertInRoot()
{
var tree = new RedBlackTree();
tree.Insert(1);
Assert.True(tree.Contains(1));
}
public void Test_Delete()
{
var bst = new RedBlackTree <Byte, Char>();
bst.Add(1, 'A');
bst.Delete(1);
Assert.False(bst.Contains(1));
}
public void ContainsTest()
{
var target = new RedBlackTree <int, GenericParameterHelper>();
var item = new GenericParameterHelper(5);
const bool expected = false;
bool actual = target.Contains(item);
Assert.AreEqual(expected, actual);
}
public void Simple()
{
var redBlackTree = new RedBlackTree <int, string>();
for (var i = 0; i < 100; i++)
{
redBlackTree.Add(i, i.ToString());
Assert.IsTrue(redBlackTree.ContainsKey(i));
Assert.AreEqual(redBlackTree.Count, i + 1);
}
for (var i = 300; i > 200; i--)
{
redBlackTree.Add(i, i.ToString());
Assert.IsTrue(redBlackTree.ContainsKey(i));
Assert.AreEqual(redBlackTree.Count, 100 + (300 - i) + 1);
}
for (var i = 100; i < 200; i++)
{
redBlackTree.Add(i, i.ToString());
Assert.IsTrue(redBlackTree.ContainsKey(i));
Assert.AreEqual(redBlackTree.Count, 100 + i + 1);
}
for (var i = 301; i < 400; i++)
{
redBlackTree.Add(new KeyValuePair <int, string>(i, i.ToString()));
Assert.IsTrue(redBlackTree.ContainsKey(i));
Assert.AreEqual(redBlackTree[i], i.ToString());
Assert.IsTrue(redBlackTree.Contains(new KeyValuePair <int, string>(i, i.ToString())));
}
Assert.IsFalse(redBlackTree.Contains(new KeyValuePair <int, string>(500, "500")));
Assert.IsFalse(redBlackTree.Contains(new KeyValuePair <int, string>(300, "301")));
Assert.IsTrue(redBlackTree.Contains(new KeyValuePair <int, string>(300, "300")));
}
/// <summary>
///A test for Contains
///</summary>
public void ContainsTestHelper <TKey, T>(TKey key, T testItem)
where T : class
where TKey : IComparable, IComparable <TKey>, IEquatable <TKey>
{
RedBlackTree <TKey, T> target = new RedBlackTree <TKey, T>();
T item = testItem;
const bool expected = false;
bool actual = target.Contains(item);
Assert.AreEqual(expected, actual);
}
public void Remove_Case1_TreeStillValid()
{
var tree = new RedBlackTree <int>();
tree.AddRange(new[] { 5, 2, 8, 1 });
tree.Remove(1);
tree.Remove(2);
tree.Contains(2).Should().BeFalse();
tree.GetKeysInOrder().SequenceEqual(new[] { 5, 8 }).Should().BeTrue();
tree.GetKeysPreOrder().SequenceEqual(new[] { 5, 8 }).Should().BeTrue();
}
public void Insert_MultipleElements_ShouldHaveQuickFind()
{
RedBlackTree <int> rbt = new RedBlackTree <int>();
for (int i = 0; i < 100000; i++)
{
rbt.Insert(i);
}
Assert.AreEqual(true, rbt.Contains(99999));
}
public void ContainsExample()
{
// Create a simple tree
var tree = new RedBlackTree <string, int>
{
new KeyValuePair <string, int>("cat", 1),
new KeyValuePair <string, int>("dog", 2),
new KeyValuePair <string, int>("canary", 3)
};
// The tree should contain 1 cat and 2 dogs...
Assert.IsTrue(tree.Contains(new KeyValuePair <string, int>("cat", 1)));
Assert.IsTrue(tree.Contains(new KeyValuePair <string, int>("dog", 2)));
// But not 3 cats and 1 dog
Assert.IsFalse(tree.Contains(new KeyValuePair <string, int>("cat", 3)));
Assert.IsFalse(tree.Contains(new KeyValuePair <string, int>("dog", 1)));
}
//
//You can use the following additional attributes as you write your tests:
//
//Use ClassInitialize to run code before running the first test in the class
//[ClassInitialize()]
//public static void MyClassInitialize(TestContext testContext)
//{
//}
//
//Use ClassCleanup to run code after all tests in a class have run
//[ClassCleanup()]
//public static void MyClassCleanup()
//{
//}
//
//Use TestInitialize to run code before running each test
//[TestInitialize()]
//public void MyTestInitialize()
//{
//}
//
//Use TestCleanup to run code after each test has run
//[TestCleanup()]
//public void MyTestCleanup()
//{
//}
//
#endregion
/// <summary>
///A test for Add
///</summary>
public void AddTestHelper <T>()
{
RedBlackTree <double> target = new RedBlackTree <double>();
double data = 3;
target.Add(1);
target.Add(2);
target.Add(data);
SearchResult actual = target.Contains(data);
Assert.IsNotNull(actual.SearchPath);
}
public void NeedSimpleBalancing1()
{
var tree = new RedBlackTree();
tree.Insert(100);
tree.Insert(200);
tree.Insert(50);
tree.Insert(75);
tree.Insert(25);
tree.Insert(20);
Assert.True(tree.Contains(100));
Assert.True(tree.Contains(200));
Assert.True(tree.Contains(50));
Assert.True(tree.Contains(75));
Assert.True(tree.Contains(25));
Assert.True(tree.Contains(20));
Assert.Equal(100, tree._root.Value);
Assert.Equal(RedBlackTree.Color.Black, tree._root.Color);
Assert.Equal(50, tree._root.Left.Value);
Assert.Equal(RedBlackTree.Color.Red, tree._root.Left.Color);
Assert.Equal(200, tree._root.Right.Value);
Assert.Equal(RedBlackTree.Color.Black, tree._root.Right.Color);
Assert.Equal(25, tree._root.Left.Left.Value);
Assert.Equal(RedBlackTree.Color.Black, tree._root.Left.Left.Color);
Assert.Equal(75, tree._root.Left.Right.Value);
Assert.Equal(RedBlackTree.Color.Black, tree._root.Left.Right.Color);
Assert.Equal(20, tree._root.Left.Left.Left.Value);
Assert.Equal(RedBlackTree.Color.Red, tree._root.Left.Left.Left.Color);
}
public void Remove_Case4_TreeStillValid()
{
var tree = new RedBlackTree <int>();
tree.AddRange(new[] { 5, 2, 8, 1, 4, 7, 9, 0, 3 });
tree.Remove(0);
tree.Remove(3);
tree.Remove(2);
tree.Count.Should().Be(6);
tree.Contains(2).Should().BeFalse();
tree.GetKeysInOrder().SequenceEqual(new[] { 1, 4, 5, 7, 8, 9 }).Should().BeTrue();
tree.GetKeysPreOrder().SequenceEqual(new[] { 5, 4, 1, 8, 7, 9 }).Should().BeTrue();
}
public void Remove_SimpleCases_TreeStillValid()
{
var tree = new RedBlackTree <int>();
tree.AddRange(new[] { 13, 8, 17, 1, 11, 15, 25, 6, 22, 27 });
tree.Remove(6);
tree.Count.Should().Be(9);
tree.Contains(6).Should().BeFalse();
tree.GetKeysInOrder().SequenceEqual(new[] { 1, 8, 11, 13, 15, 17, 22, 25, 27 }).Should().BeTrue();
tree.GetKeysPreOrder().SequenceEqual(new[] { 13, 8, 1, 11, 17, 15, 25, 22, 27 }).Should().BeTrue();
tree = new RedBlackTree <int>();
tree.AddRange(new[] { 13, 8, 17, 1, 11, 15, 25, 6, 22, 27 });
tree.Remove(1);
tree.Count.Should().Be(9);
tree.Contains(1).Should().BeFalse();
tree.GetKeysInOrder().SequenceEqual(new[] { 6, 8, 11, 13, 15, 17, 22, 25, 27 }).Should().BeTrue();
tree.GetKeysPreOrder().SequenceEqual(new[] { 13, 8, 6, 11, 17, 15, 25, 22, 27 }).Should().BeTrue();
tree = new RedBlackTree <int>();
tree.AddRange(new[] { 13, 8, 17, 1, 11, 15, 25, 6, 22, 27 });
tree.Remove(17);
tree.Count.Should().Be(9);
tree.Contains(17).Should().BeFalse();
tree.GetKeysInOrder().SequenceEqual(new[] { 1, 6, 8, 11, 13, 15, 22, 25, 27 }).Should().BeTrue();
tree.GetKeysPreOrder().SequenceEqual(new[] { 13, 8, 1, 6, 11, 22, 15, 25, 27 }).Should().BeTrue();
tree = new RedBlackTree <int>();
tree.AddRange(new[] { 13, 8, 17, 1, 11, 15, 25, 6, 22, 27 });
tree.Remove(25);
tree.Count.Should().Be(9);
tree.Contains(25).Should().BeFalse();
tree.GetKeysInOrder().SequenceEqual(new[] { 1, 6, 8, 11, 13, 15, 17, 22, 27 }).Should().BeTrue();
tree.GetKeysPreOrder().SequenceEqual(new[] { 13, 8, 1, 6, 11, 17, 15, 27, 22 }).Should().BeTrue();
tree = new RedBlackTree <int>();
tree.AddRange(new[] { 7, 3, 18, 10, 22, 8, 11, 26 });
tree.Remove(18);
tree.Count.Should().Be(7);
tree.Contains(18).Should().BeFalse();
tree.GetKeysInOrder().SequenceEqual(new[] { 3, 7, 8, 10, 11, 22, 26 }).Should().BeTrue();
tree.GetKeysPreOrder().SequenceEqual(new[] { 7, 3, 22, 10, 8, 11, 26 }).Should().BeTrue();
tree = new RedBlackTree <int>();
tree.Add(1);
tree.Add(2);
tree.Remove(1);
tree.Count.Should().Be(1);
tree.GetKeysInOrder().SequenceEqual(new[] { 2 }).Should().BeTrue();
tree.GetKeysPreOrder().SequenceEqual(new[] { 2 }).Should().BeTrue();
}
public void SortedElementsAfterAddingAndRemoving()
{
var tree = new RedBlackTree <int>();
int elementsCount = 100000;
//Adding every seventh number, then every fifth number,
//every third and at last all numbers
for (int i = 7; i > 0; i -= 2)
{
int el = 0;
while (el < elementsCount)
{
if (!tree.Contains(el))
{
tree.Add(el);
}
el += i;
}
}
bool removedEverything = true;
//Removing every second number
for (int i = 0; i < elementsCount; i += 2)
{
if (!tree.Remove(i))
{
removedEverything = false;
}
}
int last = -1;
int count = 0;
bool elementsAreSorted = true;
foreach (var item in tree)
{
if (last > item)
{
elementsAreSorted = false;
}
last = item;
count++;
}
Assert.IsTrue(tree.Count == count &&
elementsAreSorted &&
removedEverything);
}
public void TestRemoveRoot()
{
var testTree = new RedBlackTree <int>();
var initialSize = testTree.Size;
var initialContains = testTree.Contains(4);
Assert.AreEqual(0, initialSize);
Assert.AreEqual(false, initialContains);
testTree.Insert(4);
var oneSize = testTree.Size;
var fourContains = testTree.Contains(4);
Assert.AreEqual(1, oneSize);
Assert.AreEqual(true, fourContains);
testTree.Remove(4);
var twoSize = testTree.Size;
var fourContainsAfterRemove = testTree.Contains(4);
Assert.AreEqual(0, twoSize);
Assert.AreEqual(false, fourContainsAfterRemove);
}
public void RemoveRootEveryTimeUntilTreeElementsAreHalfed()
{
var tree = new RedBlackTree <int>();
int elementsCount = 100000;
//Adding every seventh number, then every fifth number,
//every third and at last all numbers
for (int i = 7; i > 0; i -= 2)
{
int el = 0;
while (el < elementsCount)
{
if (!tree.Contains(el))
{
tree.Add(el);
}
el += i;
}
}
bool removedEverything = true;
while (tree.Count > elementsCount / 2)
{
if (!tree.Remove(tree.Root.Value))
{
removedEverything = false;
}
}
int last = -1;
int count = 0;
bool elementsAreSorted = true;
foreach (var item in tree)
{
if (last > item)
{
elementsAreSorted = false;
}
last = item;
count++;
}
Assert.IsTrue(tree.Count == count &&
elementsAreSorted &&
count == elementsCount / 2 &&
removedEverything);
}
public override void Solve(IOManager io)
{
var n = io.ReadInt();
var rbTree = new RedBlackTree <int>();
for (int i = 0; i < n; i++)
{
rbTree.Add(io.ReadInt());
}
var first = rbTree.Min;
var second = rbTree.Max;
rbTree.Remove(first);
rbTree.Remove(second);
var last2 = first;
var last1 = second;
while (rbTree.Count > 0)
{
var next = last2 ^ last1;
if (rbTree.Contains(next))
{
last2 = last1;
last1 = next;
rbTree.Remove(next);
}
else
{
io.WriteLine("No");
return;
}
}
if ((last2 ^ last1) == first && (last1 ^ first) == second)
{
io.WriteLine("Yes");
}
else
{
io.WriteLine("No");
}
}
public void RedBlackTreeRemoveTest()
{
// inserting and then removing elements
RedBlackTree <Int32, String> tree = new RedBlackTree <Int32, String>();
String value;
foreach (KeyValuePair <Int32, String> keyValuePair in this.values)
{
tree.Insert(keyValuePair.Key, keyValuePair.Value);
tree.Height.ShouldBeLessThanOrEqualTo(20);
}
for (Int32 number = -1000; number < 1000; number++)
{
tree.Remove(number).ShouldBe(this.values.Select(keyValuePair => keyValuePair.Key).Contains(number));
tree.Height.ShouldBeLessThanOrEqualTo(20);
}
tree.Height.ShouldBe(-1);
tree.Count.ShouldBe(0);
foreach (KeyValuePair <Int32, String> keyValuePair in this.values)
{
tree.Insert(keyValuePair.Key, keyValuePair.Value);
tree.Height.ShouldBeLessThanOrEqualTo(20);
}
tree.Clear();
tree.Height.ShouldBe(-1);
tree.Count.ShouldBe(0);
foreach (KeyValuePair <Int32, String> keyValuePair in this.values)
{
tree.Contains(keyValuePair.Key).ShouldBeFalse();
tree.TrySearch(keyValuePair.Key, out value).ShouldBeFalse();
}
// exceptions
RedBlackTree <Object, String> objectTree = new RedBlackTree <Object, String>();
Should.Throw <ArgumentNullException>(() => objectTree.Remove(null));
}
public void Simple()
{
var redBlackTree = new RedBlackTree<int, string>();
for (var i = 0; i < 100; i++)
{
redBlackTree.Add(i, i.ToString());
Assert.IsTrue(redBlackTree.ContainsKey(i));
Assert.AreEqual(redBlackTree.Count, i + 1);
}
for (var i = 300; i > 200; i--)
{
redBlackTree.Add(i, i.ToString());
Assert.IsTrue(redBlackTree.ContainsKey(i));
Assert.AreEqual(redBlackTree.Count, 100 + (300 - i) + 1);
}
for (var i = 100; i < 200; i++)
{
redBlackTree.Add(i, i.ToString());
Assert.IsTrue(redBlackTree.ContainsKey(i));
Assert.AreEqual(redBlackTree.Count, 100 + i + 1);
}
for (var i = 301; i < 400; i++)
{
redBlackTree.Add(new KeyValuePair<int, string>(i, i.ToString()));
Assert.IsTrue(redBlackTree.ContainsKey(i));
Assert.AreEqual(redBlackTree[i], i.ToString());
Assert.IsTrue(redBlackTree.Contains(new KeyValuePair<int, string>(i, i.ToString())));
}
Assert.IsFalse(redBlackTree.Contains(new KeyValuePair<int, string>(500, "500")));
Assert.IsFalse(redBlackTree.Contains(new KeyValuePair<int, string>(300, "301")));
Assert.IsTrue(redBlackTree.Contains(new KeyValuePair<int, string>(300, "300")));
}
public void MassInsert()
{
var data = Enumerable.Range(0, 1000).ToArray();
var tree = new RedBlackTree();
foreach (var item in data)
{
tree.Insert(item);
}
foreach (var item in data)
{
Assert.True(tree.Contains(item));
}
foreach (var item in tree)
{
_testOutputHelper.WriteLine(item.ToString());
}
Assert.True(tree.IsValid());
}
public void RedBlackTreeInsertTest()
{
RedBlackTree <Int32, String> tree = new RedBlackTree <Int32, String>();
String value;
// insert elements
foreach (KeyValuePair <Int32, String> keyValuePair in this.values)
{
tree.Insert(keyValuePair.Key, keyValuePair.Value);
tree.Height.ShouldBeLessThanOrEqualTo(5); // the maximum height of a Red Black tree is 2*lg(n+1)
}
tree.Count.ShouldBe(this.values.Length);
tree.Height.ShouldBeLessThanOrEqualTo(5);
foreach (KeyValuePair <Int32, String> keyValuePair in this.values)
{
tree.Contains(keyValuePair.Key).ShouldBeTrue();
tree.Search(keyValuePair.Key).ShouldBe(keyValuePair.Value);
tree.TrySearch(keyValuePair.Key, out value).ShouldBeTrue();
value.ShouldBe(keyValuePair.Value);
}
// exceptions
Should.Throw <ArgumentException>(() => tree.Search(-10));
Should.Throw <ArgumentException>(() =>
{
tree.Insert(0, String.Empty);
tree.Insert(0, String.Empty);
});
RedBlackTree <Object, String> objectTree = new RedBlackTree <Object, String>();
Should.Throw <ArgumentNullException>(() => objectTree.Insert(null, null));
Should.Throw <ArgumentNullException>(() => objectTree.Contains(null));
Should.Throw <ArgumentNullException>(() => objectTree.TrySearch(null, out value));
}
public void RemoveAllExceptOne()
{
var tree = new RedBlackTree <int>();
int elementsCount = 100000;
//Adding every seventh number, then every fifth number,
//every third and at last all numbers
for (int i = 7; i > 0; i -= 2)
{
int el = 0;
while (el < elementsCount)
{
if (!tree.Contains(el))
{
tree.Add(el);
}
el += i;
}
}
bool removedEverything = true;
for (int i = 0; i < elementsCount - 1; i++)
{
if (!tree.Remove(i))
{
removedEverything = false;
}
}
Assert.IsTrue(tree.Count == 1 &&
removedEverything &&
tree.Root.Value == elementsCount - 1 &&
tree.Root.Left == null &&
tree.Root.Right == null);
}
public void ContainsExample()
{
// Create a simple tree
var tree = new RedBlackTree<string, int>
{
new KeyValuePair<string, int>("cat", 1),
new KeyValuePair<string, int>("dog", 2),
new KeyValuePair<string, int>("canary", 3)
};
// The tree should contain 1 cat and 2 dogs...
Assert.IsTrue(tree.Contains(new KeyValuePair<string, int>("cat", 1)));
Assert.IsTrue(tree.Contains(new KeyValuePair<string, int>("dog", 2)));
// But not 3 cats and 1 dog
Assert.IsFalse(tree.Contains(new KeyValuePair<string, int>("cat", 3)));
Assert.IsFalse(tree.Contains(new KeyValuePair<string, int>("dog", 1)));
}
public static void DoTest()
{
// Test against the worst case of insertion
// Case: insert increasing numbers and check if it leads to a linked list
var redBlackTree = new RedBlackTree<int>(allowDuplicates: false);
redBlackTree.Insert(1);
redBlackTree.Insert(2);
redBlackTree.Insert(3);
redBlackTree.Insert(4);
redBlackTree.Insert(5);
redBlackTree.Insert(6);
redBlackTree.Insert(7);
redBlackTree.Insert(8);
redBlackTree.Insert(9);
redBlackTree.Insert(10);
Debug.Assert(redBlackTree.Height < redBlackTree.Count, "Fail! Tree doesn't rebalance against sorted elements!");
Console.WriteLine("********************");
Console.WriteLine(" [*] RED-BLACK TREE:\r\n");
Console.WriteLine("********************");
Console.WriteLine(redBlackTree.DrawTree());
Console.WriteLine("\r\n");
//
// Test against re-shuffled insertions (not like above order)
redBlackTree = new RedBlackTree<int>(allowDuplicates: false);
redBlackTree.Insert(4);
redBlackTree.Insert(5);
redBlackTree.Insert(7);
redBlackTree.Insert(2);
redBlackTree.Insert(1);
redBlackTree.Insert(3);
redBlackTree.Insert(6);
redBlackTree.Insert(0);
redBlackTree.Insert(8);
redBlackTree.Insert(10);
redBlackTree.Insert(9);
//
// ASSERT INSERTING DUPLICATES WOULD BREAK
var insert_duplicate_passed = true;
try
{
// 2 already exists in tree
redBlackTree.Insert(2);
insert_duplicate_passed = true;
}
catch
{
insert_duplicate_passed = false;
}
Debug.Assert(insert_duplicate_passed == false, "Fail! The tree doesn't allow duplicates");
//
// PRINT TREE
Console.WriteLine("********************");
Console.WriteLine(" [*] RED-BLACK TREE:\r\n");
Console.WriteLine("********************");
Console.WriteLine(redBlackTree.DrawTree());
Console.WriteLine("\r\n");
// Assert count
Debug.Assert(redBlackTree.Count == 11);
// Assert existence and nonexistence of some items
Debug.Assert(redBlackTree.Contains(1) == true);
Debug.Assert(redBlackTree.Contains(3) == true);
Debug.Assert(redBlackTree.Contains(999) == false);
// ASSERT THAT EACH LEVEL HAS A DIFFERENT COLOR
Asset_Levels_Different_Colors(redBlackTree);
// Do some deletions
redBlackTree.Remove(7);
redBlackTree.Remove(1);
redBlackTree.Remove(3);
// Assert count
Debug.Assert(redBlackTree.Count == 8);
// Assert nonexistence of previously existing items
Debug.Assert(redBlackTree.Contains(1) == false);
Debug.Assert(redBlackTree.Contains(3) == false);
// Remove root value
var oldRootVal = redBlackTree.Root.Value;
redBlackTree.Remove(redBlackTree.Root.Value);
// Assert count
Debug.Assert(redBlackTree.Count == 7);
// Assert nonexistence of old root's value
Debug.Assert(redBlackTree.Contains(oldRootVal) == false);
//
// PRINT TREE
Console.WriteLine("********************");
Console.WriteLine(" [*] RED-BLACK TREE:\r\n");
Console.WriteLine("********************");
Console.WriteLine(redBlackTree.DrawTree());
Console.WriteLine("\r\n");
Console.ReadLine();
}//end-do-test
private static void run(int n)
{
var rand = Accord.Math.Tools.Random;
RedBlackTree<int> t = new RedBlackTree<int>(allowDuplicates: true);
// Create a vector of random numbers
int[] k = new int[n];
for (int i = 0; i < k.Length; i++)
k[i] = rand.Next(k.Length);
int[] sorted = (int[])k.Clone();
Array.Sort(sorted);
// Populate the tree with numbers
for (int i = 0; i < k.Length; i++)
{
var node = t.Add(k[i]);
Assert.IsNotNull(node);
Assert.AreEqual(k[i], node.Value);
Assert.IsTrue(t.check());
}
Assert.AreEqual(k.Length, t.Count);
// Check that all elements are in the tree
for (int i = 0; i < k.Length; ++i)
{
var node = t.Find(k[i]);
Assert.IsNotNull(node);
Assert.AreEqual(k[i], node.Value);
Assert.IsTrue(t.Contains(k[i]));
Assert.IsTrue(t.Contains(node));
}
// Enumerate the values (must be in order)
int arrayIndex = 0;
foreach (var node in t)
Assert.AreEqual(sorted[arrayIndex++], node.Value);
// Start from min and go navigating up to max
var min = t.Min();
Assert.IsNotNull(min);
Assert.AreEqual(k.Min(), min.Value);
for (int i = 0; i < k.Length; i++)
{
Assert.IsNotNull(min);
min = t.GetNextNode(min);
}
Assert.IsNull(min); // the last should be null.
// Start from max and go navigating down to min
var max = t.Max();
Assert.AreEqual(k.Max(), max.Value);
for (int i = 0; i < k.Length; i++)
{
Assert.IsNotNull(max);
max = t.GetPreviousNode(max);
}
Assert.IsNull(max); // the last should be null.
// Exercise the tree
for (int M = k.Length; M > 0; M--)
{
int knew = rand.Next(k.Length); // random new key
int j = rand.Next(M); // random original key to replace
int i;
for (i = 0; i < k.Length; i++)
if (k[i] >= 0)
if (j-- == 0)
break;
if (i >= k.Length)
Assert.Fail();
int kd = k[i];
var node = t.Find(kd);
Assert.IsNotNull(node);
node.Value = knew;
Assert.IsNotNull(t.Resort(node));
Assert.IsTrue(t.check());
k[i] = -1 - knew;
Assert.AreEqual(k.Length, t.Count);
}
for (int i = 0; i < k.Length; i++)
k[i] = -1 - k[i]; // undo negation above
// check the localization functions
for (int i = 0; i < k.Length; i++)
{
int kd = (int)(0.01 * (rand.Next() % (k.Length * 150) - k.Length * 25));
var le = t.FindLessThanOrEqualTo(kd);
var gt = t.FindGreaterThan(kd);
var node = t.Min();
double lek = le != null ? le.Value : int.MinValue;
double gtk = gt != null ? gt.Value : int.MaxValue;
if (node.Value > kd)
{
Assert.IsNull(le);
Assert.IsNotNull(gt);
Assert.AreEqual(gt, node);
}
else
{
var succ = node;
do
{
node = succ;
succ = t.GetNextNode(node);
} while (succ != null && succ.Value <= kd);
Assert.AreEqual(node, le);
Assert.AreEqual(succ, gt);
}
}
// Remove elements from the tree
for (int M = k.Length; M > 0; M--)
{
int j = rand.Next() % M;
int i;
for (i = 0; i < k.Length; i++)
if (k[i] >= 0)
if (j-- == 0)
break;
if (i >= k.Length)
Assert.Fail();
int kd = k[i];
var node = t.Find(kd);
Assert.IsNotNull(node);
node = t.Remove(node);
Assert.IsTrue(t.check());
k[i] = -1 - k[i];
}
// The tree should be empty
Assert.AreEqual(0, t.Count);
}
private static void duplicates(int n)
{
var rand = Accord.Math.Tools.Random;
RedBlackTree<int> t = new RedBlackTree<int>();
// Create a vector of random numbers with duplicates
int[] k = new int[n];
for (int i = 0; i < k.Length; i++)
k[i] = i;
Vector.Shuffle(k);
int[] sorted = (int[])k.Clone();
Array.Sort(sorted);
// Populate the tree with numbers
for (int i = 0; i < k.Length; i++)
{
var node = t.Add(k[i]);
Assert.IsNotNull(node);
Assert.AreEqual(k[i], node.Value);
Assert.IsTrue(t.check());
}
Assert.AreEqual(k.Length, t.Count);
// Check that all elements are in the tree
for (int i = 0; i < k.Length; i++)
{
var node = t.Find(k[i]);
Assert.IsNotNull(node);
Assert.AreEqual(k[i], node.Value);
Assert.IsTrue(t.Contains(k[i]));
Assert.IsTrue(t.Contains(node));
}
// Enumerate the values (must be in order)
int arrayIndex = 0;
foreach (var node in t)
Assert.AreEqual(sorted[arrayIndex++], node.Value);
// Populate the tree with the same numbers
for (int i = 0; i < k.Length; i++)
{
var node = t.Add(k[i]);
Assert.IsNotNull(node);
Assert.AreEqual(k[i], node.Value);
Assert.IsTrue(t.check());
}
Assert.IsTrue(t.check());
// Enumerate the values (must be in order)
arrayIndex = 0;
foreach (var node in t)
Assert.AreEqual(sorted[arrayIndex++], node.Value);
}
