C#数据结构-栈
棧是一種特殊的線性結構,是一種運算受限的數據結構,棧的特點就是是先進后出,跟我們的乒乓球筒,羽毛球筒一樣,先放進去的在棧底,后放進去的稱之為頂點或者棧頂。
這里,我們用兩種方式表達棧的運用,順序表和鏈表。
順序棧
這里標記頂點,因為棧的這種先進后出的特殊結構,入棧和出棧都是從頂點操作的。
/// <summary>/// 順序棧/// </summary>class LinkStack{const int Maxsize = 100;public string[] data;public int top;public LinkStack(){data = new string[Maxsize];top = -1;}#region 判斷是否為空棧 O(1)public bool StackEmpty(){return (top == -1);}#endregion#region 進棧 O(1)public bool Push(string values){//滿棧無法進棧if (top >= Maxsize-1){return false;}top++;data[top] = values;return true;}#endregion#region 出棧 O(1)public bool Pop(ref string values){//判斷是否為空棧if (StackEmpty()){return false;}values = data[top];top--;return true;}#endregion#region 獲取頂點值 O(1)public bool GetTop(ref string values){if (StackEmpty()){return false;}values = data[top];return true;}#endregion}
鏈式棧:
這里也是一樣,保存頭部,每次出棧入站都是操作頭部。
/// <summary>/// 鏈式棧存儲結構/// </summary>class LinkListStack{public string data;public LinkListStack next;}/// <summary>/// 鏈式棧的操作/// </summary>class LinkStackClass{LinkListStack head = new LinkListStack();public LinkStackClass(){head.next = null;}#region 判斷鏈式棧是否為空 O(1)public bool StackEmpty(){return (head.next == null);}#endregion#region 入棧 O(1)public void Push(string values){LinkListStack stacks = new LinkListStack();//頭部進棧stacks.data = values;stacks.next = head.next;head.next = stacks;}#endregion#region 出棧 O(1)public bool Pop(ref string values){LinkListStack stack;//判斷棧是否為空if (head.next==null)//StackEmpty(){return false;}//出棧從頭部出棧stack = head.next;values = stack.data;head.next = stack.next;stack = null;return true;}#endregion#region 取棧的頂點 O(1)public bool GetTop(ref string values){LinkListStack stack;//判斷棧是否為空if (head.next == null)//StackEmpty(){return false;}stack = head.next;values = stack.data;return true;}#endregion}
/// <summary>/// 鏈式棧存儲結構/// </summary>class LinkListStack{public string data;public LinkListStack next;}/// <summary>/// 鏈式棧的操作/// </summary>class LinkStackClass{LinkListStack head = new LinkListStack();public LinkStackClass(){head.next = null;}#region 判斷鏈式棧是否為空 O(1)public bool StackEmpty(){return (head.next == null);}#endregion#region 入棧 O(1)public void Push(string values){LinkListStack stacks = new LinkListStack();//頭部進棧stacks.data = values;stacks.next = head.next;head.next = stacks;}#endregion#region 出棧 O(1)public bool Pop(ref string values){LinkListStack stack;//判斷棧是否為空if (head.next==null)//StackEmpty(){return false;}//出棧從頭部出棧stack = head.next;values = stack.data;head.next = stack.next;stack = null;return true;}#endregion#region 取棧的頂點 O(1)public bool GetTop(ref string values){LinkListStack stack;//判斷棧是否為空if (head.next == null)//StackEmpty(){return false;}stack = head.next;values = stack.data;return true;}#endregion}
總結
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