C++实现数组模拟链表(实现链表的增删功能)

Posted 2021-12-10 Wecccccccc

代码如下:

#include <iostream>
using namespace std;
const int N = 100;

struct Node
{
	int data;
	int next;
};

class ArrayList
{
private:
	Node node[N];
	int maxSize;//数组容量
	int idx;//接下来要插入的结点的下标
	int len;//链表长度

public:

	void initList()
	{
		node[0].next = 0;//把0当做null
		maxSize = N;
		len = 0;
	}

	bool createList(int n)//创建初始链表
	{
		if (n > N - 1) return false;
		int x;
		for (int i = 0; i < n; i++)
		{
			cin >> x;
			node[i].next = i + 1;
			node[i + 1].data = x;
			node[i + 1].next = 0;
		}
		idx = n+1;
		len = 5;
		return true;
	}

	bool insertList(int i, int e)//在i位置插入e
	{
		if (idx == maxSize) return false;
		if (i < 1 || i > len+1 ) return false;
		if (i == 1)
		{
			node[idx].data = e;
			node[idx].next = 0;
			node[idx].next = node[0].next;
			node[0].next = idx;
			idx++;
			len++;
			return true;
		}

		int cnt = 0;
		for (int p = node[0].next; p != 0; p = node[p].next)
		{
			cnt++;
			if (cnt == i - 1)
			{
				node[idx].data = e;
				node[idx].next = 0;
				node[idx].next = node[p].next;
				node[p].next = idx;
				idx++;
				len++;
				return true;
			}
		}
		return true;
		
	}



	bool deleteList(int i, int &e)//删除i位置的元素，并把该元素的值返回给传入第二个位置的变量
	{

		if (i < 1 || i > len) return false;
		if (len == 0) return false;
		if (i == 1)
		{
			node[0].next = node[node[0].next].next;
			len--;
		}

		int cnt = 0;
		for (int p = node[0].next; p != 0; p = node[p].next)
		{
			cnt++;
			if (cnt == i - 1)
			{
				node[p].next = node[node[p].next].next;
				len--;
				return true;

			}
		}
		return true;

	}

	int locateElem(int e)//返回e元素是链表的第几个元素
	{
		int cnt = 0;
		for (int i = node[0].next; i != 0; i = node[i].next)
		{
			cnt++;
			if (node[i].data == e)
			{
				return cnt;
			}
		}
	}

	bool isElem(int e)//判断元素e是否存在
	{
		for (int i = node[0].next; i != 0; i = node[i].next)
		{
			if (node[i].data == e)
			{
				return true;
			}
		}
		return false;
	}

	void printList()//输出链表
	{
		for (int i = node[0].next; i != 0; i = node[i].next)
		{
			cout << node[i].data << " ";
		}
		cout << endl;
	}
};

int main()
{
	ArrayList l;
	l.createList(5);
	l.insertList(1, 3);
	l.insertList(2, 6);
	int a;
	l.deleteList(1, a);
	l.deleteList(2, a);
	l.insertList(1, 3);
	l.insertList(2, 6);
	cout << l.isElem(33) << endl;
	cout << l.isElem(23) << endl;
	cout << l.locateElem(33) << endl;
	l.printList();
	return 0;
}

示例如下: