yetao
/
hello-algo
mirror of https://github.com/krahets/hello-algo.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

feature: Add csharp code array_deque and linkedlist_deque (#405)

Browse Source 
* feature: Add csharp code array_deque and linkedlist_deque

* fix code style issue in comments
pull/408/head
hpstory 2 years ago committed by GitHub
parent b6c9b01d96
commit 7d55f82508
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 388 additions and 0 deletions
Show Stats Download Patch File Download Diff File

175
codes/csharp/chapter_stack_and_queue/array_deque.cs
Unescape View File

@ -0,0 +1,175 @@
/**
* File: array_deque.cs
* Created Time: 2023-03-08
* Author: hpstory (hpstory1024@163.com)
*/
using NUnit.Framework;
namespace hello_algo.chapter_stack_and_queue
{
/* 基于环形数组实现的双向队列 */
public class ArrayDeque
{
private readonly int[] nums; // 用于存储双向队列元素的数组
private int front; // 队首指针，指向队首元素
private int queSize; // 双向队列长度
/* 构造方法 */
public ArrayDeque(int capacity)
{
this.nums = new int[capacity];
front = queSize = 0;
}
/* 获取双向队列的容量 */
public int capacity()
{
return nums.Length;
}
/* 获取双向队列的长度 */
public int size()
{
return queSize;
}
/* 判断双向队列是否为空 */
public bool isEmpty()
{
return queSize == 0;
}
/* 计算环形数组索引 */
private int index(int i)
{
// 通过取余操作实现数组首尾相连
// 当 i 越过数组尾部后，回到头部
// 当 i 越过数组头部后，回到尾部
return (i + capacity()) % capacity();
}
/* 队首入队 */
public void pushFirst(int num)
{
if (queSize == capacity())
{
Console.WriteLine("双向队列已满");
return;
}
// 队首指针向左移动一位
// 通过取余操作，实现 front 越过数组头部后回到尾部
front = index(front - 1);
// 将 num 添加至队首
nums[front] = num;
queSize++;
}
/* 队尾入队 */
public void pushLast(int num)
{
if (queSize == capacity())
{
Console.WriteLine("双向队列已满");
return;
}
// 计算尾指针，指向队尾索引 + 1
int rear = index(front + queSize);
// 将 num 添加至队尾
nums[rear] = num;
queSize++;
}
/* 队首出队 */
public int pollFirst()
{
int num = peekFirst();
// 队首指针向后移动一位
front = index(front + 1);
queSize--;
return num;
}
/* 队尾出队 */
public int pollLast()
{
int num = peekLast();
queSize--;
return num;
}
/* 访问队首元素 */
public int peekFirst()
{
if (isEmpty())
{
throw new InvalidOperationException();
}
return nums[front];
}
/* 访问队尾元素 */
public int peekLast()
{
if (isEmpty())
{
throw new InvalidOperationException();
}
// 计算尾元素索引
int last = index(front + queSize - 1);
return nums[last];
}
/* 返回数组用于打印 */
public int[] toArray()
{
// 仅转换有效长度范围内的列表元素
int[] res = new int[queSize];
for (int i = 0, j = front; i < queSize; i++, j++)
{
res[i] = nums[index(j)];
}
return res;
}
}
public class array_deque
{
[Test]
public void Test()
{
/* 初始化双向队列 */
ArrayDeque deque = new ArrayDeque(10);
deque.pushLast(3);
deque.pushLast(2);
deque.pushLast(5);
Console.WriteLine("双向队列 deque = " + string.Join(" ", deque.toArray()));
/* 访问元素 */
int peekFirst = deque.peekFirst();
Console.WriteLine("队首元素 peekFirst = " + peekFirst);
int peekLast = deque.peekLast();
Console.WriteLine("队尾元素 peekLast = " + peekLast);
/* 元素入队 */
deque.pushLast(4);
Console.WriteLine("元素 4 队尾入队后 deque = " + string.Join(" ", deque.toArray()));
deque.pushFirst(1);
Console.WriteLine("元素 1 队首入队后 deque = " + string.Join(" ", deque.toArray()));
/* 元素出队 */
int pollLast = deque.pollLast();
Console.WriteLine("队尾出队元素 = " + pollLast + "，队尾出队后 deque = " + string.Join(" ", deque.toArray()));
int pollFirst = deque.pollFirst();
Console.WriteLine("队首出队元素 = " + pollFirst + "，队首出队后 deque = " + string.Join(" ", deque.toArray()));
/* 获取双向队列的长度 */
int size = deque.size();
Console.WriteLine("双向队列长度 size = " + size);
/* 判断双向队列是否为空 */
bool isEmpty = deque.isEmpty();
Console.WriteLine("双向队列是否为空 = " + isEmpty);
}
}
}

213
codes/csharp/chapter_stack_and_queue/linkedlist_deque.cs
Unescape View File

@ -0,0 +1,213 @@
/**
* File: linkedlist_deque.cs
* Created Time: 2023-03-08
* Author: hpstory (hpstory1024@163.com)
*/
using NUnit.Framework;
namespace hello_algo.chapter_stack_and_queue
{
/* 双向链表结点 */
public class ListNode
{
public int val; // 结点值
public ListNode? next; // 后继结点引用（指针）
public ListNode? prev; // 前驱结点引用（指针）
public ListNode(int val)
{
this.val = val;
prev = null;
next = null;
}
}
/* 基于双向链表实现的双向队列 */
public class LinkedListDeque
{
private ListNode? front, rear; // 头结点 front, 尾结点 rear
private int queSize = 0; // 双向队列的长度
public LinkedListDeque()
{
front = null;
rear = null;
}
/* 获取双向队列的长度 */
public int size()
{
return queSize;
}
/* 判断双向队列是否为空 */
public bool isEmpty()
{
return size() == 0;
}
/* 入队操作 */
private void push(int num, bool isFront)
{
ListNode node = new ListNode(num);
// 若链表为空，则令 front, rear 都指向 node
if (isEmpty())
{
front = node;
rear = node;
}
// 队首入队操作
else if (isFront)
{
// 将 node 添加至链表头部
front.prev = node;
node.next = front;
front = node; // 更新头结点
}
// 队尾入队操作
else
{
// 将 node 添加至链表尾部
rear.next = node;
node.prev = rear;
rear = node; // 更新尾结点
}
queSize++; // 更新队列长度
}
/* 队首入队 */
public void pushFirst(int num)
{
push(num, true);
}
/* 队尾入队 */
public void pushLast(int num)
{
push(num, false);
}
/* 出队操作 */
private int? poll(bool isFront)
{
// 若队列为空，直接返回 null
if (isEmpty())
{
return null;
}
int val;
// 队首出队操作
if (isFront)
{
val = front.val; // 暂存头结点值
// 删除头结点
ListNode fNext = front.next;
if (fNext != null)
{
fNext.prev = null;
front.next = null;
}
front = fNext; // 更新头结点
}
// 队尾出队操作
else
{
val = rear.val; // 暂存尾结点值
// 删除尾结点
ListNode rPrev = rear.prev;
if (rPrev != null)
{
rPrev.next = null;
rear.prev = null;
}
rear = rPrev; // 更新尾结点
}
queSize--; // 更新队列长度
return val;
}
/* 队首出队 */
public int? pollFirst()
{
return poll(true);
}
/* 队尾出队 */
public int? pollLast()
{
return poll(false);
}
/* 访问队首元素 */
public int? peekFirst()
{
return isEmpty() ? null : front.val;
}
/* 访问队尾元素 */
public int? peekLast()
{
return isEmpty() ? null : rear.val;
}
/* 返回数组用于打印 */
public int[] toArray()
{
ListNode node = front;
int[] res = new int[size()];
for (int i = 0; i < res.Length; i++)
{
res[i] = node.val;
node = node.next;
}
return res;
}
}
public class linkedlist_deque
{
[Test]
public void Test()
{
/* 初始化双向队列 */
LinkedListDeque deque = new LinkedListDeque();
deque.pushLast(3);
deque.pushLast(2);
deque.pushLast(5);
Console.WriteLine("双向队列 deque = " + string.Join(" ", deque.toArray()));
/* 访问元素 */
int? peekFirst = deque.peekFirst();
Console.WriteLine("队首元素 peekFirst = " + peekFirst);
int? peekLast = deque.peekLast();
Console.WriteLine("队尾元素 peekLast = " + peekLast);
/* 元素入队 */
deque.pushLast(4);
Console.WriteLine("元素 4 队尾入队后 deque = " + string.Join(" ", deque.toArray()));
deque.pushFirst(1);
Console.WriteLine("元素 1 队首入队后 deque = " + string.Join(" ", deque.toArray()));
/* 元素出队 */
int? pollLast = deque.pollLast();
Console.WriteLine("队尾出队元素 = " + pollLast + "，队尾出队后 deque = " + string.Join(" ", deque.toArray()));
int? pollFirst = deque.pollFirst();
Console.WriteLine("队首出队元素 = " + pollFirst + "，队首出队后 deque = " + string.Join(" ", deque.toArray()));
/* 获取双向队列的长度 */
int size = deque.size();
Console.WriteLine("双向队列长度 size = " + size);
/* 判断双向队列是否为空 */
bool isEmpty = deque.isEmpty();
Console.WriteLine("双向队列是否为空 = " + isEmpty);
}
}
}
Write Preview
Loading…
Cancel
Save