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重构项目结构，实现链表LRU缓存和链表反转等几个常规操作

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robin 2019-01-11 16:48:26 +08:00
parent 1e4b89cfc2
commit 53a4d69bc8
23 changed files with 1210 additions and 848 deletions
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223
csharp/05-array/Array.Tests.cs
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@ -1,223 +0,0 @@
using System;
using Xunit;
using Xunit.Abstractions;
public class ArrayTests
{
private readonly Array<int> _sqList;
private readonly ITestOutputHelper _output;
public ArrayTests (ITestOutputHelper output)
{
_sqList = new Array<int> (10);
_output = output;
}
private void PrintList ()
{
for (int idx = 0; idx < _sqList.Length; idx++)
{
var elem = _sqList.Find (idx + 1);
_output.WriteLine (elem.ToString ());
}
}
[Fact]
public void Length_Equal_0_When_List_Is_Empty ()
{
Assert.True (_sqList.Length == 0);
}
[Fact]
public void Length_Equal_1_After_InsertOneElement ()
{
_sqList.Insert (1, 1);
Assert.True (_sqList.Length == 1);
}
[Fact]
public void Insert_ThrowIndexOutOfRangeException_When_PositionGreaterThanLength ()
{
_sqList.Insert (1, 1);
Exception ex = Assert.Throws<IndexOutOfRangeException> (() => _sqList.Insert (3, 1));
Assert.IsType<IndexOutOfRangeException> (ex);
}
[Fact]
public void Insert_ThrowIndexOutOfRangeException_When_PositionLessThanOne ()
{
Exception ex = Assert.Throws<IndexOutOfRangeException> (() => _sqList.Insert (0, 1));
Assert.IsType<IndexOutOfRangeException> (ex);
}
[Fact]
public void Insert_ThrowIndexOutOfRangeException_When_List_Is_Full ()
{
_sqList.Insert (1, 10);
_sqList.Insert (2, 9);
_sqList.Insert (3, 8);
_sqList.Insert (4, 7);
_sqList.Insert (5, 6);
_sqList.Insert (6, 5);
_sqList.Insert (7, 4);
_sqList.Insert (8, 3);
_sqList.Insert (9, 2);
_sqList.Insert (10, 1);
PrintList ();
Exception ex = Assert.Throws<OutOfMemoryException> (() => _sqList.Insert (11, 101));
Assert.IsType<OutOfMemoryException> (ex);
}
[Fact]
public void Delete_ThrowIndexOutOfRangeException_When_PositionLessThanOne ()
{
Exception ex = Assert.Throws<IndexOutOfRangeException> (() => _sqList.Delete (0));
Assert.IsType<IndexOutOfRangeException> (ex);
}
[Fact]
public void Delete_ThrowIndexOutOfRangeException_When_PositionGreaterThanLength ()
{
_sqList.Insert (1, 11);
_sqList.Insert (2, 22);
Exception ex = Assert.Throws<IndexOutOfRangeException> (() => _sqList.Delete (3));
Assert.IsType<IndexOutOfRangeException> (ex);
}
[Fact]
public void Delete_First_Element ()
{
_sqList.Insert (1, 11);
_sqList.Insert (2, 22);
var elem = _sqList.Delete (1);
Assert.Equal (11, elem);
}
[Fact]
public void Delete_Last_Element ()
{
_sqList.Insert (1, 11);
_sqList.Insert (2, 22);
_sqList.Insert (3, 33);
var elem = _sqList.Delete (3);
Assert.Equal (33, elem);
}
[Fact]
public void Delete_Middle_Element ()
{
_sqList.Insert (1, 11);
_sqList.Insert (2, 22);
_sqList.Insert (3, 33);
var elem = _sqList.Delete (2);
Assert.Equal (22, elem);
}
[Fact]
public void GetElem_ThrowsIndexOutOfRangeException_When_PositionLessThanZero ()
{
_sqList.Insert (1, 11);
_sqList.Insert (2, 22);
_sqList.Insert (3, 33);
Exception ex = Assert.Throws<IndexOutOfRangeException> (() => _sqList.Find (0));
Assert.IsType<IndexOutOfRangeException> (ex);
}
[Fact]
public void GetElem_ThrowsIndexOutOfRangeException_When_PositionGreaterThanLength ()
{
_sqList.Insert (1, 11);
_sqList.Insert (2, 22);
_sqList.Insert (3, 33);
Exception ex = Assert.Throws<IndexOutOfRangeException> (() => _sqList.Find (4));
Assert.IsType<IndexOutOfRangeException> (ex);
}
[Fact]
public void GetElem_Last_Position_Return_33 ()
{
_sqList.Insert (1, 11);
_sqList.Insert (2, 22);
_sqList.Insert (3, 33);
var elem = _sqList.Find (3);
Assert.Equal (33, elem);
}
[Fact]
public void GetElem_First_Position_Return_11 ()
{
_sqList.Insert (1, 11);
_sqList.Insert (2, 22);
_sqList.Insert (3, 33);
var elem = _sqList.Find (1);
Assert.Equal (11, elem);
}
[Fact]
public void IndexOf_Return_Netagive1_When_Element_Not_Exist ()
{
_sqList.Insert (1, 11);
_sqList.Insert (2, 22);
_sqList.Insert (3, 33);
var elem = _sqList.IndexOf (55);
Assert.Equal (-1, elem);
}
[Fact]
public void IndexOf_Return_First_Index ()
{
_sqList.Insert (1, 11);
_sqList.Insert (2, 22);
_sqList.Insert (3, 33);
var elem = _sqList.IndexOf (11);
Assert.Equal (0, elem);
}
[Fact]
public void IndexOf_Return_Last_Index ()
{
_sqList.Insert (1, 11);
_sqList.Insert (2, 22);
_sqList.Insert (3, 33);
var elem = _sqList.IndexOf (33);
Assert.Equal (2, elem);
}
[Fact]
public void Clear_Length_Equal_Zero_If_Empty ()
{
_sqList.Insert (1, 10);
_sqList.Insert (2, 9);
_sqList.Insert (3, 8);
_sqList.Insert (4, 7);
_sqList.Insert (5, 6);
_sqList.Insert (6, 5);
_sqList.Insert (7, 4);
_sqList.Insert (8, 3);
_sqList.Insert (9, 2);
_sqList.Insert (10, 1);
Assert.Equal (10, _sqList.Length);
_sqList.Clear ();
Assert.Equal (0, _sqList.Length);
}
}

93
csharp/05-array/Array.cs
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@ -1,12 +1,14 @@
using System; using System;
public sealed class Array<T> namespace _05_array
{ {
public sealed class Array<T> where T : IComparable<T>
{
private T[] _data; private T[] _data;
private int _capacity; private readonly int _capacity;
private int _length; private int _length;
public Array (int capacity) public Array(int capacity)
{ {
_data = new T[capacity]; _data = new T[capacity];
_capacity = capacity; _capacity = capacity;
@ -16,84 +18,99 @@ public sealed class Array<T>
// length of list // length of list
public int Length => _length; public int Length => _length;
// insert a new element at specified position (position start from 1) // insert a new element at specified index (index start from 0)
public void Insert (int position, T newElem) public void Insert(int index, T newElem)
{ {
if (_length == _capacity) if (_length == _capacity)
{ {
throw new OutOfMemoryException ("List has no more space"); throw new OutOfMemoryException("List has no more space");
} }
if (position < 1 || position > _length + 1) if (index < 0 || index > _length)
{ {
throw new IndexOutOfRangeException ("Position was outside the bounds of the list"); throw new IndexOutOfRangeException("Index was outside the bounds of the list");
} }
// to loop array from last position until finding the target position // to loop array from end until finding the target index
if (position <= _length) for (int k = _length; k > index; k--)
{ {
for (int k = _length - 1; k >= position - 1; k--) _data[k] = _data[k - 1];
{ }
_data[k + 1] = _data[k];
} _data[index] = newElem;
}
_data[position - 1] = newElem;
_length++; _length++;
} }
// get an element (position start from 1) // get an element base on index
public T Find (int position) public T Find(int index)
{ {
if (position < 0 || position > _length) if (index < 0 || index > _length - 1)
{ {
throw new IndexOutOfRangeException ("Position was outside the bounds of the list"); throw new IndexOutOfRangeException("Index was outside the bounds of the list");
}
return _data[position - 1];
} }
// search the element which matches specified element and return its index (index start from 0) return _data[index];
public int IndexOf (T elem) }
// search the node which matches specified value and return its index (index start from 0)
public int IndexOf(T val)
{ {
if (_length == 0) return -1; if (_length == 0) return -1;
if (_data[0].Equals (elem)) return 0; if (_data[0].Equals(val)) return 0;
if (_data[_length - 1].Equals (elem)) return _length - 1; if (_data[_length - 1].CompareTo(val) == 0) return _length - 1;
int start = 0; int start = 1;
while (start < _length - 1) while (start < _length - 1)
{ {
if (_data[start].Equals (elem)) return start; if (_data[start].CompareTo(val) == 0) return start;
start++; start++;
continue;
} }
return -1; return -1;
} }
// delete an element which is on the specified position (position start from 1) // delete an node which is on the specified index
public T Delete (int position) public bool Delete(int index)
{ {
if (position < 1 || position > _length) if (index < 0 || index > _length - 1)
{ {
throw new IndexOutOfRangeException ("Position must be in the bound of list"); throw new IndexOutOfRangeException("Index must be in the bound of list");
} }
var elem = _data[position - 1]; T deletedElem = _data[index];
for (int k = position; k < _length; k++) if (index < _length - 1)
{ {
_data[k - 1] = _data[k]; for (int k = index; k < _length; k++)
{
_data[k] = _data[k + 1];
}
} }
_length--; _length--;
return elem; return true;
}
// delete an node
public bool Delete(T val)
{
int index;
for (index = 0; index < Length; index++)
{
if (_data[index].CompareTo(val) == 0) break;
}
if (index >= Length) return false;
return Delete(index);
} }
// clear list // clear list
public void Clear () public void Clear()
{ {
_data = new T[_capacity]; _data = new T[_capacity];
_length = 0; _length = 0;
} }
}
} }

8
csharp/05-array/_05_array.csproj
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@ -1,4 +1,4 @@
<Project Sdk="Microsoft.NET.Sdk"> <Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup> <PropertyGroup>
<TargetFramework>netcoreapp2.2</TargetFramework> <TargetFramework>netcoreapp2.2</TargetFramework>
@ -6,10 +6,4 @@
<IsPackable>false</IsPackable> <IsPackable>false</IsPackable>
</PropertyGroup> </PropertyGroup>
<ItemGroup>
<PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.9.0" />
<PackageReference Include="xunit" Version="2.4.0" />
<PackageReference Include="xunit.runner.visualstudio" Version="2.4.0" />
</ItemGroup>
</Project> </Project>

45
csharp/06-linkedlist/LRUWithArray.cs Normal file
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@ -0,0 +1,45 @@
using System.Text.RegularExpressions;
using _05_array;
namespace _06_linked_list
{
/// <summary>
/// 使用数组实现LRU缓存淘汰算法
/// </summary>
public class LRUWithArray
{
private readonly int _capacity;
public LRUWithArray(int capacity)
{
_capacity = capacity;
CachedList = new Array<int>(capacity);
}
public Array<int> CachedList { get; }
public void Set(int val)
{
// 找出该值在缓存中的索引位置
int idx = CachedList.IndexOf(val);
// 存在该缓存值
if (idx != -1)
{
CachedList.Delete(idx);
CachedList.Insert(0, val);
return;
}
// 不存在该缓存值
if (CachedList.Length == _capacity)
{
// 缓存已满，删除最后一个元素
CachedList.Delete(CachedList.Length - 1);
}
// 将新缓存插入到表头
CachedList.Insert(0, val);
}
}
}

48
csharp/06-linkedlist/LRUWithLinkedList.cs Normal file
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@ -0,0 +1,48 @@
namespace _06_linked_list
{
/// <summary>
/// 使用单链表实现LRU缓存淘汰算法
/// </summary>
public class LRUWithLinkedList
{
private readonly int _capacity;
/// <summary>
/// 构造函数
/// </summary>
/// <param name="capacity">缓存容量</param>
public LRUWithLinkedList(int capacity = 10)
{
_capacity = capacity;
}
public SingleLinkedList<int> CachedList { get; } = new SingleLinkedList<int>();
/// <summary>
/// 存储缓存数据
/// </summary>
/// <param name="val"></param>
public void Set(int val)
{
// 尝试删除匹配到和给定值相等的结点，并返回
var deletedNode = CachedList.Delete(value: val);
// 数据在缓存中存在，从原位置删除，然后插入到表头
if (deletedNode != null)
{
CachedList.Insert(1, val);
return;
}
// 数据不存在
if (CachedList.Length == _capacity)
{
// 链表已满，删除尾结点，将新数据插入到头部
CachedList.Delete(CachedList.Length);
}
// 将新缓存值插入到表头
CachedList.Insert(1, val);
}
}
}

8
csharp/06-linkedlist/LRU缓存实现思路.txt Normal file
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@ -0,0 +1,8 @@
实现LRU缓存淘汰算法思路：
维护一个有序单链表，越靠近链尾的数据是最早访问的。
当有一个新的数据被访问时，
1. 如果数据在缓存中，则将其从原位置删除，然后插入到表头；
2. 如果数据不在缓存中，有两种情况：
1) 链表未满，则将数据插入到表头；
2) 链表已满，则删除尾结点，将新数据插入到表头。

163
csharp/06-linkedlist/SingleLinkedList.cs Normal file
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@ -0,0 +1,163 @@
using System;
namespace _06_linked_list
{
/// <summary>
/// 单链表的插入、删除、清空、查找
/// </summary>
/// <typeparam name="T"></typeparam>
public class SingleLinkedList<T> where T : IComparable<T>
{
public SingleLinkedList()
{
Head = new ListNode<T>(default(T));
}
public SingleLinkedList(params T[] list)
{
Head = new ListNode<T>(default(T));
if (list == null) return;
var p = Head;
foreach (var item in list)
{
var q = new ListNode<T>(item);
p.Next = q;
p = q;
}
Length = list.Length;
}
// Head node
public ListNode<T> First => Head.Next;
public ListNode<T> Head { get; }
public int Length { get; private set; }
public ListNode<T> Insert(int position, T newElem)
{
if (position < 1 || position > Length + 1)
{
throw new IndexOutOfRangeException("Position must be in bound of list");
}
var p = Head;
int j = 1;
while (p != null && j < position)
{
p = p.Next;
++j;
}
var newNode = new ListNode<T>(newElem);
newNode.Next = p.Next;
p.Next = newNode;
Length++;
return newNode;
}
public ListNode<T> Find(int position)
{
ListNode<T> p = First;
int j = 1;
while (p != null && j < position)
{
p = p.Next;
j++;
}
if (p == null || j > position)
{
return null;
}
return p;
}
public ListNode<T> Find(T elem)
{
ListNode<T> p = Head.Next;
while (p != null)
{
if (p.Value.CompareTo(elem) == 0) return p;
p = p.Next;
}
return null;
}
public ListNode<T> Delete(T value)
{
ListNode<T> cur = Head;
while (cur.Next != null && cur.Next.Value.CompareTo(value) != 0)
{
cur = cur.Next;
}
if (cur.Next == null) return null;
var q = cur.Next;
cur.Next = q.Next;
Length--;
return q;
}
public ListNode<T> Delete(int position)
{
if (position < 1 || position > Length)
{
return null;
}
var p = First;
int j = 1;
while (p != null && j < position - 1)
{
p = p.Next;
++j;
}
var q = p.Next;
p.Next = q.Next;
Length--;
return q;
}
public void Clear()
{
var cur = Head;
while (cur.Next != null)
{
var q = cur.Next;
cur.Next = null;
cur = q;
}
Length = 0;
}
}
public class ListNode<T>
{
public ListNode(T value)
{
Value = value;
}
public T Value { get; }
public ListNode<T> Next { get; set; }
}
}

13
csharp/06-linkedlist/_06_linked_list.csproj Normal file
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@ -0,0 +1,13 @@
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>netcoreapp2.2</TargetFramework>
<IsPackable>false</IsPackable>
</PropertyGroup>
<ItemGroup>
<ProjectReference Include="..\05-array\_05_array.csproj" />
</ItemGroup>
</Project>

63
csharp/06_linkedlist/LRULinkedList.cs
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@ -1,63 +0,0 @@
namespace _06_linked_list
{
/// <summary>
/// 使用单链表实现LRU缓存淘汰算法
/// </summary>
/// <remarks>
/// 思路：
/// 维护一个有序单链表，越是靠近链尾的数据是最早访问的。当有一个新的数据被访问时，
/// 1. 如果数据在缓存中，则将其从原位置删除，然后插入到表头；
/// 2. 如果数据不在缓存中，有两种情况：
/// 1) 链表未满，则将数据插入到表头；
/// 2) 链表已满，则删除尾结点，将新数据插入到表头。
/// </remarks>
public class LRULinkedList
{
private readonly SingleLinkedList<int> _cachedList = new SingleLinkedList<int>();
private readonly int _capacity;
/// <summary>
/// 构造函数
/// </summary>
/// <param name="capacity">缓存容量</param>
public LRULinkedList(int capacity = 10)
{
_capacity = capacity;
}
/// <summary>
/// 存储缓存数据
/// </summary>
/// <param name="val"></param>
public void Set(int val)
{
var deletedNode = _cachedList.Delete(value: val);
// 数据在缓存中存在，从原位置删除，然后插入到表头
if (deletedNode != null)
{
_cachedList.Insert(1, val);
return;
}
// 数据不存在
if (_cachedList.Length != _capacity)
{
// 链表未满
_cachedList.Insert(1, val);
}
else
{
// 链表已满，删除尾结点，将新数据插入到头部
_cachedList.Delete(_cachedList.Length);
_cachedList.Insert(1, val);
}
}
public SingleLinkedList<int> GetCachedList()
{
return _cachedList;
}
}
}

320
csharp/06_linkedlist/SingleLinkedList.cs
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@ -1,320 +0,0 @@
using System;
namespace _06_linked_list
{
/// <summary>
/// 单链表的插入、删除、清空、查找
/// 1. 链表反转
/// 2. 环的检测
/// 3. 两个有序链表的合并
/// 4. 删除链表倒数第n个结点
/// 5. 求链表的中间结点
/// </summary>
/// <typeparam name="T"></typeparam>
public class SingleLinkedList<T> where T : IComparable<T>
{
public SingleLinkedList ()
{
Head = new LinkedListNode<T> (default (T));
}
public SingleLinkedList (params T[] list)
{
Head = new LinkedListNode<T> (default (T));
if (list == null) return;
var p = Head;
foreach (var item in list)
{
var q = new LinkedListNode<T> (item);
p.Next = q;
p = q;
}
Length = list.Length;
}
// Head node
public LinkedListNode<T> First => Head.Next;
public LinkedListNode<T> Head { get; }
public int Length { get; private set; }
public LinkedListNode<T> Insert (int position, T newElem)
{
if (position < 1 || position > Length + 1)
{
throw new IndexOutOfRangeException ("Position must be in bound of list");
}
var p = Head;
int j = 1;
while (p != null && j < position)
{
p = p.Next;
++j;
}
var newNode = new LinkedListNode<T> (newElem);
newNode.Next = p.Next;
p.Next = newNode;
Length++;
return newNode;
}
public LinkedListNode<T> Find (int position)
{
LinkedListNode<T> p = First;
int j = 1;
while (p != null && j < position)
{
p = p.Next;
j++;
}
if (p == null || j > position)
{
return null;
}
return p;
}
public LinkedListNode<T> Find (T elem)
{
LinkedListNode<T> p = Head.Next;
while (p != null)
{
if (p.Value.CompareTo (elem) == 0) return p;
p = p.Next;
}
return null;
}
public LinkedListNode<T> Delete (T value)
{
LinkedListNode<T> cur = Head;
while (cur.Next != null && cur.Next.Value.CompareTo (value) != 0)
{
cur = cur.Next;
}
if (cur.Next == null) return null;
var q = cur.Next;
cur.Next = q.Next;
Length--;
return q;
}
public LinkedListNode<T> Delete (int position)
{
if (position < 1 || position > Length)
{
return null;
}
var p = First;
int j = 1;
while (p != null && j < position - 1)
{
p = p.Next;
++j;
}
var q = p.Next;
p.Next = q.Next;
Length--;
return q;
}
public void Clear ()
{
var cur = Head;
while (cur.Next != null)
{
var q = cur.Next;
cur.Next = null;
cur = q;
}
Length = 0;
}
/// <summary>
/// reverse current list
/// </summary>
public void Reverse ()
{
if (Length <= 1) return;
LinkedListNode<T> p = First;
LinkedListNode<T> q = First.Next;
LinkedListNode<T> r = null;
p.Next = null;
while (q != null)
{
r = q.Next;
q.Next = p;
p = q;
q = r;
}
Head.Next = p;
}
/// <summary>
/// 环的检测
/// </summary>
/// <remarks>
/// 用快慢两个指针，快指针每次移动2个结点，慢指针每次移动1个结点，当两个指针相遇时，说明存在环。
/// LeetCode 编号： 141
/// </remarks>
public bool HasCycle ()
{
if (Length == 0) return false;
var slow = Head.Next;
var fast = Head.Next.Next;
while (fast != null && slow != null && fast != slow)
{
fast = fast.Next?.Next;
slow = slow.Next;
}
bool ret = fast == slow;
return ret;
}
/// <summary>
/// 合并两个有序链表(从小到大)
/// </summary>
/// <remarks>LeetCode 编号： 21</remarks>
/// <param name="list"></param>
/// <returns></returns>
public SingleLinkedList<T> Merge (SingleLinkedList<T> list)
{
if (list == null) return null;
var root = new SingleLinkedList<T> ();
LinkedListNode<T> pointer = root.Head; // 总是向新链表的尾结点
var head1 = list.First;
var head2 = this.First;
while (head1 != null && head2 != null)
{
if (head1.Value.CompareTo (head2.Value) < 0)
{
pointer.Next = head1;
head1 = head1.Next;
}
else
{
pointer.Next = head2;
head2 = head2.Next;
}
pointer = pointer.Next; // 指向尾结点
}
if (head1 != null)
{
pointer.Next = head1;
}
if (head2 != null)
{
pointer.Next = head2;
}
return root;
}
/// <summary>
/// 删除倒数第n个结点
/// </summary>
/// <remarks>
/// 用快慢两个指针，快指针比慢指针早n个结点，然后再同步移动两个指针，当快指针指向尾结点时，慢指针就是将要删除的结点
/// LeetCode 编号： 19
/// </remarks>
/// <param name="n"></param>
public void RemoveNthNodeFromEnd (int n)
{
if (n < 1 || n > Length) return;
LinkedListNode<T> preNode = Head;
LinkedListNode<T> curNode = Head;
for (int i = 0; i < n; i++)
{
curNode = curNode.Next;
}
if (curNode == null) return;
while (curNode.Next != null)
{
preNode = preNode.Next;
curNode = curNode.Next;
}
preNode.Next = preNode.Next.Next;
}
/// <summary>
/// 链表的中间结点
/// </summary>
/// <remarks>
/// 思路： 利用快慢指针，快指针步长2，慢指针步长1，当快指针到达尾结点时，慢指针正好到达中间结点
/// LeetCode 编号： 876
/// </remarks>
/// <returns></returns>
public LinkedListNode<T> FindMiddleNode ()
{
if (First?.Next == null) return null;
LinkedListNode<T> slowPointer = First;
LinkedListNode<T> fastPointer = First.Next;
while (fastPointer.Next?.Next != null)
{
fastPointer = fastPointer.Next.Next;
slowPointer = slowPointer.Next;
}
slowPointer = slowPointer.Next;
return slowPointer;
}
}
public class LinkedListNode<T>
{
private T _value;
public LinkedListNode (T value)
{
_value = value;
}
public T Value => _value;
public LinkedListNode<T> Next { get; set; }
}
}

172
csharp/07-linkedlist/_07_linkedlist/SingleLinkedListAlgo.cs Normal file
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@ -0,0 +1,172 @@
using System;
using _06_linked_list;
namespace _07_linkedlist
{
/// <summary>
/// 单链表常用算法操作
/// 1. 链表反转
/// 2. 环的检测
/// 3. 两个有序链表的合并
/// 4. 删除链表倒数第n个结点
/// 5. 求链表的中间结点
/// </summary>
/// <typeparam name="T"></typeparam>
public class SingleLinkedListAlgo<T> : SingleLinkedList<T> where T : IComparable<T>
{
public SingleLinkedListAlgo(params T[] list) : base(list)
{
}
/// <summary>
/// 链表反转
/// </summary>
public void Reverse()
{
if (Length <= 1) return;
ListNode<T> p = First;
ListNode<T> q = First.Next;
ListNode<T> r = null;
p.Next = null;
while (q != null)
{
r = q.Next;
q.Next = p;
p = q;
q = r;
}
Head.Next = p;
}
/// <summary>
/// 环的检测
/// </summary>
/// <remarks>
/// 用快慢两个指针，快指针每次移动2个结点，慢指针每次移动1个结点，当两个指针相遇时，说明存在环。
/// LeetCode 编号： 141
/// </remarks>
public bool HasCycle()
{
if (Length == 0) return false;
var slow = Head.Next;
var fast = Head.Next.Next;
while (fast != null && slow != null && fast != slow)
{
fast = fast.Next?.Next;
slow = slow.Next;
}
bool ret = fast == slow;
return ret;
}
/// <summary>
/// 合并两个有序链表(从小到大)
/// </summary>
/// <remarks>LeetCode 编号： 21</remarks>
/// <param name="listAlgo"></param>
/// <returns></returns>
public SingleLinkedListAlgo<T> Merge(SingleLinkedListAlgo<T> listAlgo)
{
if (listAlgo == null) return null;
var root = new SingleLinkedListAlgo<T>();
ListNode<T> pointer = root.Head; // 总是向新链表的尾结点
var head1 = listAlgo.First;
var head2 = this.First;
while (head1 != null && head2 != null)
{
if (head1.Value.CompareTo(head2.Value) < 0)
{
pointer.Next = head1;
head1 = head1.Next;
}
else
{
pointer.Next = head2;
head2 = head2.Next;
}
pointer = pointer.Next; // 指向尾结点
}
if (head1 != null)
{
pointer.Next = head1;
}
if (head2 != null)
{
pointer.Next = head2;
}
return root;
}
/// <summary>
/// 删除倒数第n个结点
/// </summary>
/// <remarks>
/// 用快慢两个指针，快指针比慢指针早n个结点，然后再同步移动两个指针，当快指针指向尾结点时，慢指针就是将要删除的结点
/// LeetCode 编号： 19
/// </remarks>
/// <param name="n"></param>
public void RemoveNthNodeFromEnd(int n)
{
if (n < 1 || n > Length) return;
ListNode<T> preNode = Head;
ListNode<T> curNode = Head;
for (int i = 0; i < n; i++)
{
curNode = curNode.Next;
}
if (curNode == null) return;
while (curNode.Next != null)
{
preNode = preNode.Next;
curNode = curNode.Next;
}
preNode.Next = preNode.Next.Next;
}
/// <summary>
/// 链表的中间结点
/// </summary>
/// <remarks>
/// 思路： 利用快慢指针，快指针步长2，慢指针步长1，当快指针到达尾结点时，慢指针正好到达中间结点
/// LeetCode 编号： 876
/// </remarks>
/// <returns></returns>
public ListNode<T> FindMiddleNode()
{
if (First?.Next == null) return null;
ListNode<T> slowPointer = First;
ListNode<T> fastPointer = First.Next;
while (fastPointer.Next?.Next != null)
{
fastPointer = fastPointer.Next.Next;
slowPointer = slowPointer.Next;
}
slowPointer = slowPointer.Next;
return slowPointer;
}
}
}

11
csharp/07-linkedlist/_07_linkedlist/_07_linkedlist.csproj Normal file
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@ -0,0 +1,11 @@
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>netcoreapp2.2</TargetFramework>
</PropertyGroup>
<ItemGroup>
<ProjectReference Include="..\..\06-linkedlist\_06_linked_list.csproj" />
</ItemGroup>
</Project>

231
csharp/Tests/_05_array_tests/Array.Tests.cs Normal file
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@ -0,0 +1,231 @@
using System;
using Xunit;
using Xunit.Abstractions;
using _05_array;
namespace _05_array_tests
{
public class ArrayTests
{
private readonly Array<int> _sqList;
private readonly ITestOutputHelper _output;
public ArrayTests(ITestOutputHelper output)
{
_sqList = new Array<int>(10);
_output = output;
}
private void PrintList()
{
for (int idx = 0; idx < _sqList.Length; idx++)
{
var elem = _sqList.Find(idx);
_output.WriteLine(elem.ToString());
}
}
[Fact]
public void Length_Equal_1_After_InsertOneElement()
{
_sqList.Insert(0, 1);
Assert.True(_sqList.Length == 1);
}
[Fact]
public void Insert_ThrowIndexOutOfRangeException_When_Index_GreaterThan_Length()
{
_sqList.Insert(0, 1);
Exception ex = Assert.Throws<IndexOutOfRangeException>(() => _sqList.Insert(3, 2));
Assert.IsType<IndexOutOfRangeException>(ex);
}
[Fact]
public void Insert_ThrowIndexOutOfRangeException_When_Index_LessThan_Zero()
{
Exception ex = Assert.Throws<IndexOutOfRangeException>(() => _sqList.Insert(-1, 1));
Assert.IsType<IndexOutOfRangeException>(ex);
}
[Fact]
public void Insert_ThrowIndexOutOfRangeException_When_List_Is_Full()
{
_sqList.Insert(0, 11);
_sqList.Insert(1, 10);
_sqList.Insert(2, 9);
_sqList.Insert(3, 8);
_sqList.Insert(4, 7);
_sqList.Insert(5, 6);
_sqList.Insert(6, 5);
_sqList.Insert(7, 4);
_sqList.Insert(8, 3);
_sqList.Insert(9, 2);
PrintList();
Exception ex = Assert.Throws<OutOfMemoryException>(() => _sqList.Insert(10, 101));
Assert.IsType<OutOfMemoryException>(ex);
}
[Fact]
public void Delete_ThrowIndexOutOfRangeException_When_Index_LessThan_Zero()
{
Exception ex = Assert.Throws<IndexOutOfRangeException>(() => _sqList.Delete(-1));
Assert.IsType<IndexOutOfRangeException>(ex);
}
[Fact]
public void Delete_ThrowIndexOutOfRangeException_When_Index_GreaterThan_Length()
{
_sqList.Insert(0, 11);
_sqList.Insert(1, 22);
Exception ex = Assert.Throws<IndexOutOfRangeException>(() => _sqList.Delete(3));
Assert.IsType<IndexOutOfRangeException>(ex);
}
[Fact]
public void Delete_First_Element_Success()
{
_sqList.Insert(0, 100);
_sqList.Insert(1, 11);
_sqList.Insert(2, 22);
bool ret = _sqList.Delete(1);
Assert.True(ret);
}
[Fact]
public void Delete_Last_Element_Success()
{
_sqList.Insert(0, 100);
_sqList.Insert(1, 11);
_sqList.Insert(2, 22);
_sqList.Insert(3, 33);
bool ret = _sqList.Delete(3);
Assert.True(ret);
}
[Fact]
public void Delete_Middle_Element()
{
_sqList.Insert(0, 100);
_sqList.Insert(1, 11);
_sqList.Insert(2, 22);
_sqList.Insert(3, 33);
bool ret = _sqList.Delete(2);
Assert.True(ret);
}
[Fact]
public void Find_ThrowsIndexOutOfRangeException_When_Index_LessThan_Zero()
{
_sqList.Insert(0, 100);
_sqList.Insert(1, 11);
_sqList.Insert(2, 22);
_sqList.Insert(3, 33);
Exception ex = Assert.Throws<IndexOutOfRangeException>(() => _sqList.Find(-1));
Assert.IsType<IndexOutOfRangeException>(ex);
}
[Fact]
public void Find_ThrowsIndexOutOfRangeException_When_Index_GreaterThan_Length()
{
_sqList.Insert(0, 100);
_sqList.Insert(1, 11);
_sqList.Insert(2, 22);
_sqList.Insert(3, 33);
Exception ex = Assert.Throws<IndexOutOfRangeException>(() => _sqList.Find(4));
Assert.IsType<IndexOutOfRangeException>(ex);
}
[Fact]
public void Find_Last_Position_Return_33()
{
_sqList.Insert(0, 100);
_sqList.Insert(1, 11);
_sqList.Insert(2, 22);
_sqList.Insert(3, 33);
var elem = _sqList.Find(3);
Assert.Equal(33, elem);
}
[Fact]
public void Find_First_Element_Return_11()
{
_sqList.Insert(0, 100);
_sqList.Insert(1, 11);
_sqList.Insert(2, 22);
_sqList.Insert(3, 33);
var elem = _sqList.Find(1);
Assert.Equal(11, elem);
}
[Fact]
public void IndexOf_Return_Negative_1_When_Element_Not_Exist()
{
_sqList.Insert(0, 100);
_sqList.Insert(1, 11);
_sqList.Insert(2, 22);
_sqList.Insert(3, 33);
var elem = _sqList.IndexOf(55);
Assert.Equal(-1, elem);
}
[Fact]
public void IndexOf_Return_First_Index()
{
_sqList.Insert(0, 100);
_sqList.Insert(1, 11);
_sqList.Insert(2, 22);
_sqList.Insert(3, 33);
var elem = _sqList.IndexOf(100);
Assert.Equal(0, elem);
}
[Fact]
public void IndexOf_Return_Last_Index()
{
_sqList.Insert(0, 100);
_sqList.Insert(1, 11);
_sqList.Insert(2, 22);
_sqList.Insert(3, 33);
var elem = _sqList.IndexOf(33);
Assert.Equal(3, elem);
}
[Fact]
public void Clear_Then_Length_Equal_Zero()
{
_sqList.Insert(0, 100);
_sqList.Insert(1, 10);
_sqList.Insert(2, 9);
_sqList.Insert(3, 8);
_sqList.Insert(4, 7);
_sqList.Insert(5, 6);
_sqList.Insert(6, 5);
_sqList.Insert(7, 4);
_sqList.Insert(8, 3);
_sqList.Insert(9, 2);
Assert.Equal(10, _sqList.Length);
_sqList.Clear();
Assert.Equal(0, _sqList.Length);
}
}
}

8
csharp/06_linkedlist/_06_linked_list.csproj → csharp/Tests/_05_array_tests/_05_array_tests.csproj
View File

@ -1,9 +1,11 @@
<Project Sdk="Microsoft.NET.Sdk"> <Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup> <PropertyGroup>
<TargetFramework>netcoreapp2.2</TargetFramework> <TargetFramework>netcoreapp2.2</TargetFramework>
<IsPackable>false</IsPackable> <IsPackable>false</IsPackable>
<AssemblyName>05_array_tests</AssemblyName>
</PropertyGroup> </PropertyGroup>
<ItemGroup> <ItemGroup>
@ -12,4 +14,8 @@
<PackageReference Include="xunit.runner.visualstudio" Version="2.4.0" /> <PackageReference Include="xunit.runner.visualstudio" Version="2.4.0" />
</ItemGroup> </ItemGroup>
<ItemGroup>
<ProjectReference Include="..\..\05-array\_05_array.csproj" />
</ItemGroup>
</Project> </Project>

5
csharp/06_linkedlist/BaseLinkedListTests.cs → csharp/Tests/_06_linkedlist_tests/BaseLinkedListTests.cs
View File

@ -1,10 +1,11 @@
using System; using System;
using _06_linked_list;
namespace _06_linked_list namespace _06_linkedlist_tests
{ {
public class BaseLinkedListTests public class BaseLinkedListTests
{ {
protected void PrintList<T> (SingleLinkedList<T> list) where T : IComparable<T> protected void PrintLinkedList<T> (SingleLinkedList<T> list) where T : IComparable<T>
{ {
if (list == null) return; if (list == null) return;

82
csharp/Tests/_06_linkedlist_tests/LRUWithArray.Tests.cs Normal file
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@ -0,0 +1,82 @@
using Xunit;
using Xunit.Abstractions;
using _05_array;
using _06_linked_list;
namespace _06_linkedlist_tests
{
public class LRUWithArrayTests
{
private ITestOutputHelper _output;
public LRUWithArrayTests(ITestOutputHelper output)
{
_output = output;
}
private void PrintList(Array<int> list)
{
if (list == null) return;
for (int idx = 0; idx < list.Length; idx++)
{
_output.WriteLine(list.Find(idx).ToString());
}
}
[Fact]
public void LRU_Set_Value_When_Not_Existed()
{
var lru = new LRUWithArray(5);
lru.Set(1);
lru.Set(3);
lru.Set(5);
lru.Set(7);
lru.Set(9);
var list = lru.CachedList;
PrintList(list);
Assert.Equal(9, list.Find(0));
}
[Fact]
public void LRU_Set_Value_When_Existed()
{
var lru = new LRUWithArray(5);
lru.Set(1);
lru.Set(3);
lru.Set(5);
lru.Set(7);
lru.Set(3);
var list = lru.CachedList;
PrintList(list);
Assert.Equal(3, list.Find(0));
}
[Fact]
public void LRU_Set_Value_When_Full()
{
var lru = new LRUWithArray(5);
lru.Set(1);
lru.Set(3);
lru.Set(5);
lru.Set(7);
lru.Set(9);
lru.Set(8);
var list = lru.CachedList;
PrintList(list);
Assert.Equal(8, list.Find(0));
}
}
}

23
csharp/06_linkedlist/LRULinkedList.Tests.cs → csharp/Tests/_06_linkedlist_tests/LRUWithLinkedList.Tests.cs
View File

@ -1,14 +1,15 @@
using Xunit; using Xunit;
using Xunit.Abstractions; using Xunit.Abstractions;
using _06_linked_list;
namespace _06_linked_list namespace _06_linkedlist_tests
{ {
public class LRULinkedListTests : BaseLinkedListTests public class LRUWithLinkedListTests : BaseLinkedListTests
{ {
[Fact] [Fact]
public void LRU_Set_Value_When_Not_Existed() public void LRU_Set_Value_When_Not_Existed()
{ {
var lru = new LRULinkedList(); var lru = new LRUWithLinkedList();
lru.Set(1); lru.Set(1);
lru.Set(3); lru.Set(3);
@ -16,9 +17,9 @@ namespace _06_linked_list
lru.Set(7); lru.Set(7);
lru.Set(9); lru.Set(9);
var list = lru.GetCachedList(); var list = lru.CachedList;
PrintList(list); PrintLinkedList(list);
Assert.Equal(9, list.First.Value); Assert.Equal(9, list.First.Value);
} }
@ -26,7 +27,7 @@ namespace _06_linked_list
[Fact] [Fact]
public void LRU_Set_Value_When_Existed() public void LRU_Set_Value_When_Existed()
{ {
var lru = new LRULinkedList(); var lru = new LRUWithLinkedList();
lru.Set(1); lru.Set(1);
lru.Set(3); lru.Set(3);
@ -34,9 +35,9 @@ namespace _06_linked_list
lru.Set(7); lru.Set(7);
lru.Set(3); lru.Set(3);
var list = lru.GetCachedList(); var list = lru.CachedList;
PrintList(list); PrintLinkedList(list);
Assert.Equal(3, list.First.Value); Assert.Equal(3, list.First.Value);
} }
@ -44,7 +45,7 @@ namespace _06_linked_list
[Fact] [Fact]
public void LRU_Set_Value_When_Full() public void LRU_Set_Value_When_Full()
{ {
var lru = new LRULinkedList(5); var lru = new LRUWithLinkedList(5);
lru.Set(1); lru.Set(1);
lru.Set(3); lru.Set(3);
@ -53,9 +54,9 @@ namespace _06_linked_list
lru.Set(9); lru.Set(9);
lru.Set(8); lru.Set(8);
var list = lru.GetCachedList(); var list = lru.CachedList;
PrintList(list); PrintLinkedList(list);
Assert.Equal(8, list.First.Value); Assert.Equal(8, list.First.Value);
} }

163
csharp/06_linkedlist/SingleLinkedList.Tests.cs → csharp/Tests/_06_linkedlist_tests/SingleLinkedList.Tests.cs
View File

@ -1,8 +1,9 @@
using System; using System;
using Xunit; using Xunit;
using Xunit.Abstractions; using Xunit.Abstractions;
using _06_linked_list;
namespace _06_linked_list namespace _06_linkedlist_tests
{ {
public class SingleLinkedListTests : BaseLinkedListTests public class SingleLinkedListTests : BaseLinkedListTests
{ {
@ -11,7 +12,7 @@ namespace _06_linked_list
{ {
var list = new SingleLinkedList<string>("The", "Quick", "Brown"); var list = new SingleLinkedList<string>("The", "Quick", "Brown");
PrintList(list); PrintLinkedList(list);
Assert.Equal(3, list.Length); Assert.Equal(3, list.Length);
} }
@ -33,7 +34,7 @@ namespace _06_linked_list
} }
[Fact] [Fact]
public void Find_Return_Null_When_Postion_LessThan_1() public void Find_Return_Null_When_Position_LessThan_1()
{ {
var list = new SingleLinkedList<string>("The", "Quick", "Brown"); var list = new SingleLinkedList<string>("The", "Quick", "Brown");
@ -42,7 +43,7 @@ namespace _06_linked_list
} }
[Fact] [Fact]
public void Find_Return_Null_When_Postion_GreaterThan_Length() public void Find_Return_Null_When_Position_GreaterThan_Length()
{ {
var list = new SingleLinkedList<string>("The", "Quick", "Brown"); var list = new SingleLinkedList<string>("The", "Quick", "Brown");
@ -51,7 +52,7 @@ namespace _06_linked_list
} }
[Fact] [Fact]
public void Find_Return_Correct_When_Postion_Valid() public void Find_Return_Correct_When_Position_Valid()
{ {
var list = new SingleLinkedList<string>("The", "Quick", "Brown"); var list = new SingleLinkedList<string>("The", "Quick", "Brown");
@ -60,7 +61,7 @@ namespace _06_linked_list
} }
[Fact] [Fact]
public void Delete_Return_Null_When_Postion_LessThan_1() public void Delete_Return_Null_When_Position_LessThan_1()
{ {
var list = new SingleLinkedList<string>("The", "Quick", "Brown"); var list = new SingleLinkedList<string>("The", "Quick", "Brown");
@ -69,7 +70,7 @@ namespace _06_linked_list
} }
[Fact] [Fact]
public void Delete_Return_Null_When_Postion_GreaterThan_Length() public void Delete_Return_Null_When_Position_GreaterThan_Length()
{ {
var list = new SingleLinkedList<string>("The", "Quick", "Brown"); var list = new SingleLinkedList<string>("The", "Quick", "Brown");
@ -85,7 +86,7 @@ namespace _06_linked_list
var deletedNode = list.Delete("over"); var deletedNode = list.Delete("over");
PrintList(list); PrintLinkedList(list);
Assert.Equal("over", deletedNode.Value); Assert.Equal("over", deletedNode.Value);
Assert.Equal(8, list.Length); Assert.Equal(8, list.Length);
@ -99,7 +100,7 @@ namespace _06_linked_list
var deletedNode = list.Delete("hello"); var deletedNode = list.Delete("hello");
PrintList(list); PrintLinkedList(list);
Assert.Null(deletedNode); Assert.Null(deletedNode);
Assert.Equal(9, list.Length); Assert.Equal(9, list.Length);
@ -113,7 +114,7 @@ namespace _06_linked_list
var deletedNode = list.Delete("The"); var deletedNode = list.Delete("The");
PrintList(list); PrintLinkedList(list);
Assert.Equal("The", deletedNode.Value); Assert.Equal("The", deletedNode.Value);
Assert.Equal(8, list.Length); Assert.Equal(8, list.Length);
@ -127,7 +128,7 @@ namespace _06_linked_list
var deletedNode = list.Delete("dog"); var deletedNode = list.Delete("dog");
PrintList(list); PrintLinkedList(list);
Assert.Equal("dog", deletedNode.Value); Assert.Equal("dog", deletedNode.Value);
Assert.Equal(8, list.Length); Assert.Equal(8, list.Length);
@ -141,7 +142,7 @@ namespace _06_linked_list
var node = list.Delete(3); var node = list.Delete(3);
PrintList(list); PrintLinkedList(list);
Assert.Equal("Brown", node.Value); Assert.Equal("Brown", node.Value);
Assert.Equal(8, list.Length); Assert.Equal(8, list.Length);
@ -167,143 +168,5 @@ namespace _06_linked_list
Assert.Null(list.First); Assert.Null(list.First);
} }
[Fact]
public void Reverse_When_List_Is_Empty()
{
var list = new SingleLinkedList<string>();
list.Reverse();
PrintList(list);
Assert.Null(list.First);
}
[Fact]
public void Reverse_When_List_Has_Many_Elements()
{
var list = new SingleLinkedList<string>("The", "Quick", "Brown", "Fox", "jumps", "over", "the", "lazy",
"dog");
list.Reverse();
PrintList(list);
Assert.True(list.First.Value == "dog");
}
[Fact]
public void HasCycle_List_Empty()
{
var list = new SingleLinkedList<string>("The", "Quick", "Brown", "Fox", "jumps", "over", "the", "lazy",
"dog");
bool hasCycle = list.HasCycle();
Assert.False(hasCycle);
}
[Fact]
public void HasCycle_False_When_List_Length_1()
{
var list = new SingleLinkedList<string>("The");
bool hasCycle = list.HasCycle();
Assert.False(hasCycle);
}
[Fact]
public void HasCycle_False_When_List_Length_2()
{
var list = new SingleLinkedList<string>("The", "Quick");
bool hasCycle = list.HasCycle();
Assert.False(hasCycle);
}
[Fact]
public void HasCycle_True_When_List_Length_2()
{
var list = new SingleLinkedList<string>();
var firstNode = list.Insert(1, "The");
var secondNode = list.Insert(2, "Quick");
secondNode.Next = firstNode;
bool hasCycle = list.HasCycle();
Assert.True(hasCycle);
}
[Fact]
public void HasCycle_False()
{
var linkList =
new SingleLinkedList<string>("The", "Quick", "Brown", "fox", "jumps", "over", "the", "lazy", "dog");
bool hasCycle = linkList.HasCycle();
Assert.False(hasCycle);
}
[Fact]
public void HasCycle_True()
{
var list = new SingleLinkedList<string>();
// 初始化一个具有环的链表
list.Insert(1, "The");
list.Insert(2, "Quick");
list.Insert(3, "Brown");
var fourthNode = list.Insert(4, "fox");
list.Insert(5, "jumps");
list.Insert(6, "over");
list.Insert(7, "the");
list.Insert(8, "lazy");
var last = list.Insert(9, "dog");
last.Next = fourthNode;
bool hasCycle = list.HasCycle();
Assert.True(hasCycle);
}
[Fact]
public void Merge()
{
var list1 = new SingleLinkedList<int>(1, 2, 4);
var list2 = new SingleLinkedList<int>(1, 3, 4);
var list3 = list1.Merge(list2);
PrintList(list3);
Assert.True(list1.First.Next.Next.Value == 2);
}
[Fact]
public void Remove_2th_Node_From_End()
{
var list = new SingleLinkedList<int>(1, 2, 3, 4, 5);
list.RemoveNthNodeFromEnd(2);
PrintList(list);
Assert.True(list.First.Next.Next.Next.Value == 5);
}
[Fact]
public void FindMiddleNode()
{
var list = new SingleLinkedList<int>(1, 2, 3, 4, 5);
LinkedListNode<int> middleNode = list.FindMiddleNode();
Assert.True(middleNode.Value == 3);
}
} }
} }

21
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csharp/Tests/_07_linkedlist_tests/SingleLinkedListAlgo.Tests.cs Normal file
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using System;
using Xunit;
using _06_linkedlist_tests;
using _06_linked_list;
using _07_linkedlist;
namespace _07_linkedlist_tests
{
public class SingleLinkedListAlgoTests : BaseLinkedListTests
{
[Fact]
public void Reverse_When_List_Is_Empty()
{
var list = new SingleLinkedListAlgo<string>();
list.Reverse();
PrintLinkedList(list);
Assert.Null(list.First);
}
[Fact]
public void Reverse_When_List_Has_Many_Elements()
{
var list = new SingleLinkedListAlgo<string>("The", "Quick", "Brown", "Fox", "jumps", "over", "the", "lazy",
"dog");
list.Reverse();
PrintLinkedList(list);
Assert.True(list.First.Value == "dog");
}
[Fact]
public void HasCycle_List_Empty()
{
var list = new SingleLinkedListAlgo<string>("The", "Quick", "Brown", "Fox", "jumps", "over", "the", "lazy",
"dog");
bool hasCycle = list.HasCycle();
Assert.False(hasCycle);
}
[Fact]
public void HasCycle_False_When_List_Length_1()
{
var list = new SingleLinkedListAlgo<string>("The");
bool hasCycle = list.HasCycle();
Assert.False(hasCycle);
}
[Fact]
public void HasCycle_False_When_List_Length_2()
{
var list = new SingleLinkedListAlgo<string>("The", "Quick");
bool hasCycle = list.HasCycle();
Assert.False(hasCycle);
}
[Fact]
public void HasCycle_True_When_List_Length_2()
{
var list = new SingleLinkedListAlgo<string>();
var firstNode = list.Insert(1, "The");
var secondNode = list.Insert(2, "Quick");
secondNode.Next = firstNode;
bool hasCycle = list.HasCycle();
Assert.True(hasCycle);
}
[Fact]
public void HasCycle_False()
{
var linkList =
new SingleLinkedListAlgo<string>("The", "Quick", "Brown", "fox", "jumps", "over", "the", "lazy", "dog");
bool hasCycle = linkList.HasCycle();
Assert.False(hasCycle);
}
[Fact]
public void HasCycle_True()
{
var list = new SingleLinkedListAlgo<string>();
// 初始化一个具有环的链表
list.Insert(1, "The");
list.Insert(2, "Quick");
list.Insert(3, "Brown");
var fourthNode = list.Insert(4, "fox");
list.Insert(5, "jumps");
list.Insert(6, "over");
list.Insert(7, "the");
list.Insert(8, "lazy");
var last = list.Insert(9, "dog");
last.Next = fourthNode;
bool hasCycle = list.HasCycle();
Assert.True(hasCycle);
}
[Fact]
public void Merge()
{
var list1 = new SingleLinkedListAlgo<int>(1, 2, 4);
var list2 = new SingleLinkedListAlgo<int>(1, 3, 4);
var list3 = list1.Merge(list2);
PrintLinkedList(list3);
Assert.True(list1.First.Next.Next.Value == 2);
}
[Fact]
public void Remove_2th_Node_From_End()
{
var list = new SingleLinkedListAlgo<int>(1, 2, 3, 4, 5);
list.RemoveNthNodeFromEnd(2);
PrintLinkedList(list);
Assert.True(list.First.Next.Next.Next.Value == 5);
}
[Fact]
public void FindMiddleNode()
{
var list = new SingleLinkedListAlgo<int>(1, 2, 3, 4, 5);
ListNode<int> middleNode = list.FindMiddleNode();
Assert.True(middleNode.Value == 3);
}
}
}

21
csharp/Tests/_07_linkedlist_tests/_07_linkedlist_tests.csproj Normal file
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111
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